noaa: moving apps to examples.

author: Tom Rondeau <trondeau@vt.edu> 2012-04-02 22:51:55 -0400
committer: Tom Rondeau <trondeau@vt.edu> 2012-04-02 22:51:55 -0400
commit: 350726ae56d46d2c7c1adf71b7049369a428d455 (patch)
tree: 81749fb01891f6eb7c536ceb95f67a3ef68d9019 /gr-noaa/examples
parent: 54b761bfced5574377c1e1a0295fbe3720c104b8 (diff)
11 files changed, 6788 insertions, 0 deletions
diff --git a/gr-noaa/examples/CMakeLists.txt b/gr-noaa/examples/CMakeLists.txt
new file mode 100644
index 0000000000..233f0ee5f9
--- /dev/null
+++ b/gr-noaa/examples/CMakeLists.txt
@@ -0,0 +1,31 @@
+# Copyright 2011 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+
+include(GrPython)
+
+GR_PYTHON_INSTALL(
+    PROGRAMS
+    hrpt_decode.py
+    hrpt_demod.py
+    file_rx_hrpt.py
+    usrp_rx_hrpt.py
+    usrp_rx_hrpt_nogui.py
+    DESTINATION ${GR_RUNTIME_DIR}
+    COMPONENT "noaa_python"
+)
diff --git a/gr-noaa/examples/file_rx_hrpt.grc b/gr-noaa/examples/file_rx_hrpt.grc
new file mode 100644
index 0000000000..4097e83d36
--- /dev/null
+++ b/gr-noaa/examples/file_rx_hrpt.grc
@@ -0,0 +1,903 @@
+<?xml version='1.0' encoding='ASCII'?>
+<flow_graph>
+  <timestamp>Thu Oct 27 13:48:25 2011</timestamp>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2*math.pi*100e3/sample_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(575, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sym_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>600*1109</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(301, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sps</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>sample_rate/sym_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(397, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(sps/2.0)</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(499, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100e-6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(705, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>import math, os</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(9, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>os.environ['HOME']+'/.gnuradio/config.conf'</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(13, 168)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>4e6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(198, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_clock_recovery_mm_xx</key>
+    <param>
+      <key>id</key>
+      <value>digital_clock_recovery_mm_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>omega</key>
+      <value>sps/2.0</value>
+    </param>
+    <param>
+      <key>gain_omega</key>
+      <value>clock_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>gain_mu</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>omega_relative_limit</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(897, 341)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_sink</key>
+    <param>
+      <key>id</key>
+      <value>virtual_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>baseband</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1139, 373)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_pll_cf</key>
+    <param>
+      <key>id</key>
+      <value>pll</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>beta</key>
+      <value>pll_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>max_offset</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(470, 357)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_moving_average_xx</key>
+    <param>
+      <key>id</key>
+      <value>gr_moving_average_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>length</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0/hs</value>
+    </param>
+    <param>
+      <key>max_iter</key>
+      <value>4000</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(683, 357)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_sink</key>
+    <param>
+      <key>id</key>
+      <value>frame_sink</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>unbuffered</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(809, 595)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_decoder</key>
+    <param>
+      <key>id</key>
+      <value>decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>output</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(810, 496)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_agc_xx</key>
+    <param>
+      <key>id</key>
+      <value>agc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>1e-6</value>
+    </param>
+    <param>
+      <key>reference</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>max_gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(302, 349)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_interleaved_short_to_complex</key>
+    <param>
+      <key>id</key>
+      <value>gr_interleaved_short_to_complex_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(92, 377)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_throttle</key>
+    <param>
+      <key>id</key>
+      <value>throttle</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>2*sample_rate</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(94, 323)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_source</key>
+    <param>
+      <key>id</key>
+      <value>gr_file_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(95, 257)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1698e6</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'freq'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(218, 104)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>35</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'gain'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>gain</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(375, 105)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'pll_alpha'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(534, 104)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'clock_alpha'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(692, 104)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'frames.hrpt'</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'filename'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(850, 105)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_deframer</key>
+    <param>
+      <key>id</key>
+      <value>deframer</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(598, 546)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>baseband</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(90, 542)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_binary_slicer_fb</key>
+    <param>
+      <key>id</key>
+      <value>digital_binary_slicer_fb_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(332, 546)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>file_rx_hrpt</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>USRP HRPT Receiver</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>4096,4096</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>no_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>digital_clock_recovery_mm_xx_0</source_block_id>
+    <sink_block_id>virtual_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_moving_average_xx_0</source_block_id>
+    <sink_block_id>digital_clock_recovery_mm_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>pll</source_block_id>
+    <sink_block_id>gr_moving_average_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>agc</source_block_id>
+    <sink_block_id>pll</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>deframer</source_block_id>
+    <sink_block_id>decoder</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>deframer</source_block_id>
+    <sink_block_id>frame_sink</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_interleaved_short_to_complex_0</source_block_id>
+    <sink_block_id>agc</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>throttle</source_block_id>
+    <sink_block_id>gr_interleaved_short_to_complex_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_file_source_0</source_block_id>
+    <sink_block_id>throttle</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0</source_block_id>
+    <sink_block_id>digital_binary_slicer_fb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_binary_slicer_fb_0</source_block_id>
+    <sink_block_id>deframer</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-noaa/examples/file_rx_hrpt.py b/gr-noaa/examples/file_rx_hrpt.py
new file mode 100755
index 0000000000..fcd1832f6a
--- /dev/null
+++ b/gr-noaa/examples/file_rx_hrpt.py
@@ -0,0 +1,239 @@
+#!/usr/bin/env python
+##################################################
+# Gnuradio Python Flow Graph
+# Title: USRP HRPT Receiver
+# Generated: Thu Oct 27 13:48:25 2011
+##################################################
+
+from gnuradio import digital
+from gnuradio import eng_notation
+from gnuradio import gr
+from gnuradio import noaa
+from gnuradio.eng_option import eng_option
+from gnuradio.gr import firdes
+from optparse import OptionParser
+import ConfigParser
+import math, os
+
+class file_rx_hrpt(gr.top_block):
+
+	def __init__(self):
+		gr.top_block.__init__(self, "USRP HRPT Receiver")
+
+		##################################################
+		# Variables
+		##################################################
+		self.sym_rate = sym_rate = 600*1109
+		self.sample_rate = sample_rate = 4e6
+		self.sps = sps = sample_rate/sym_rate
+		self.config_filename = config_filename = os.environ['HOME']+'/.gnuradio/config.conf'
+		self._pll_alpha_config = ConfigParser.ConfigParser()
+		self._pll_alpha_config.read(config_filename)
+		try: pll_alpha = self._pll_alpha_config.getfloat('usrp_rx_hrpt', 'pll_alpha')
+		except: pll_alpha = 0.01
+		self.pll_alpha = pll_alpha
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(config_filename)
+		try: output_filename = self._output_filename_config.get('usrp_rx_hrpt', 'filename')
+		except: output_filename = 'frames.hrpt'
+		self.output_filename = output_filename
+		self.max_clock_offset = max_clock_offset = 100e-6
+		self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
+		self.hs = hs = int(sps/2.0)
+		self._gain_config = ConfigParser.ConfigParser()
+		self._gain_config.read(config_filename)
+		try: gain = self._gain_config.getfloat('usrp_rx_hrpt', 'gain')
+		except: gain = 35
+		self.gain = gain
+		self._freq_config = ConfigParser.ConfigParser()
+		self._freq_config.read(config_filename)
+		try: freq = self._freq_config.getfloat('usrp_rx_hrpt', 'freq')
+		except: freq = 1698e6
+		self.freq = freq
+		self._clock_alpha_config = ConfigParser.ConfigParser()
+		self._clock_alpha_config.read(config_filename)
+		try: clock_alpha = self._clock_alpha_config.getfloat('usrp_rx_hrpt', 'clock_alpha')
+		except: clock_alpha = 0.01
+		self.clock_alpha = clock_alpha
+
+		##################################################
+		# Blocks
+		##################################################
+		self.throttle = gr.throttle(gr.sizeof_short*1, 2*sample_rate)
+		self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
+		self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000)
+		self.gr_interleaved_short_to_complex_0 = gr.interleaved_short_to_complex()
+		self.gr_file_source_0 = gr.file_source(gr.sizeof_short*1, "input_filename", False)
+		self.frame_sink = gr.file_sink(gr.sizeof_short*1, output_filename)
+		self.frame_sink.set_unbuffered(False)
+		self.digital_clock_recovery_mm_xx_0 = digital.clock_recovery_mm_ff(sps/2.0, clock_alpha**2/4.0, 0.5, clock_alpha, max_clock_offset)
+		self.digital_binary_slicer_fb_0 = digital.binary_slicer_fb()
+		self.deframer = noaa.hrpt_deframer()
+		self.decoder = noaa.hrpt_decoder(True,True)
+		self.agc = gr.agc_cc(1e-6, 1.0, 1.0, 1.0)
+
+		##################################################
+		# Connections
+		##################################################
+		self.connect((self.gr_moving_average_xx_0, 0), (self.digital_clock_recovery_mm_xx_0, 0))
+		self.connect((self.pll, 0), (self.gr_moving_average_xx_0, 0))
+		self.connect((self.agc, 0), (self.pll, 0))
+		self.connect((self.deframer, 0), (self.decoder, 0))
+		self.connect((self.deframer, 0), (self.frame_sink, 0))
+		self.connect((self.gr_interleaved_short_to_complex_0, 0), (self.agc, 0))
+		self.connect((self.throttle, 0), (self.gr_interleaved_short_to_complex_0, 0))
+		self.connect((self.gr_file_source_0, 0), (self.throttle, 0))
+		self.connect((self.digital_clock_recovery_mm_xx_0, 0), (self.digital_binary_slicer_fb_0, 0))
+		self.connect((self.digital_binary_slicer_fb_0, 0), (self.deframer, 0))
+
+	def get_sym_rate(self):
+		return self.sym_rate
+
+	def set_sym_rate(self, sym_rate):
+		self.sym_rate = sym_rate
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def get_sample_rate(self):
+		return self.sample_rate
+
+	def set_sample_rate(self, sample_rate):
+		self.sample_rate = sample_rate
+		self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def get_sps(self):
+		return self.sps
+
+	def set_sps(self, sps):
+		self.sps = sps
+		self.set_hs(int(self.sps/2.0))
+		self.digital_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
+
+	def get_config_filename(self):
+		return self.config_filename
+
+	def set_config_filename(self, config_filename):
+		self.config_filename = config_filename
+		self._freq_config = ConfigParser.ConfigParser()
+		self._freq_config.read(self.config_filename)
+		if not self._freq_config.has_section('usrp_rx_hrpt'):
+			self._freq_config.add_section('usrp_rx_hrpt')
+		self._freq_config.set('usrp_rx_hrpt', 'freq', str(self.freq))
+		self._freq_config.write(open(self.config_filename, 'w'))
+		self._gain_config = ConfigParser.ConfigParser()
+		self._gain_config.read(self.config_filename)
+		if not self._gain_config.has_section('usrp_rx_hrpt'):
+			self._gain_config.add_section('usrp_rx_hrpt')
+		self._gain_config.set('usrp_rx_hrpt', 'gain', str(self.gain))
+		self._gain_config.write(open(self.config_filename, 'w'))
+		self._pll_alpha_config = ConfigParser.ConfigParser()
+		self._pll_alpha_config.read(self.config_filename)
+		if not self._pll_alpha_config.has_section('usrp_rx_hrpt'):
+			self._pll_alpha_config.add_section('usrp_rx_hrpt')
+		self._pll_alpha_config.set('usrp_rx_hrpt', 'pll_alpha', str(self.pll_alpha))
+		self._pll_alpha_config.write(open(self.config_filename, 'w'))
+		self._clock_alpha_config = ConfigParser.ConfigParser()
+		self._clock_alpha_config.read(self.config_filename)
+		if not self._clock_alpha_config.has_section('usrp_rx_hrpt'):
+			self._clock_alpha_config.add_section('usrp_rx_hrpt')
+		self._clock_alpha_config.set('usrp_rx_hrpt', 'clock_alpha', str(self.clock_alpha))
+		self._clock_alpha_config.write(open(self.config_filename, 'w'))
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(self.config_filename)
+		if not self._output_filename_config.has_section('usrp_rx_hrpt'):
+			self._output_filename_config.add_section('usrp_rx_hrpt')
+		self._output_filename_config.set('usrp_rx_hrpt', 'filename', str(self.output_filename))
+		self._output_filename_config.write(open(self.config_filename, 'w'))
+
+	def get_pll_alpha(self):
+		return self.pll_alpha
+
+	def set_pll_alpha(self, pll_alpha):
+		self.pll_alpha = pll_alpha
+		self.pll.set_alpha(self.pll_alpha)
+		self.pll.set_beta(self.pll_alpha**2/4.0)
+		self._pll_alpha_config = ConfigParser.ConfigParser()
+		self._pll_alpha_config.read(self.config_filename)
+		if not self._pll_alpha_config.has_section('usrp_rx_hrpt'):
+			self._pll_alpha_config.add_section('usrp_rx_hrpt')
+		self._pll_alpha_config.set('usrp_rx_hrpt', 'pll_alpha', str(self.pll_alpha))
+		self._pll_alpha_config.write(open(self.config_filename, 'w'))
+
+	def get_output_filename(self):
+		return self.output_filename
+
+	def set_output_filename(self, output_filename):
+		self.output_filename = output_filename
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(self.config_filename)
+		if not self._output_filename_config.has_section('usrp_rx_hrpt'):
+			self._output_filename_config.add_section('usrp_rx_hrpt')
+		self._output_filename_config.set('usrp_rx_hrpt', 'filename', str(self.output_filename))
+		self._output_filename_config.write(open(self.config_filename, 'w'))
+
+	def get_max_clock_offset(self):
+		return self.max_clock_offset
+
+	def set_max_clock_offset(self, max_clock_offset):
+		self.max_clock_offset = max_clock_offset
+
+	def get_max_carrier_offset(self):
+		return self.max_carrier_offset
+
+	def set_max_carrier_offset(self, max_carrier_offset):
+		self.max_carrier_offset = max_carrier_offset
+		self.pll.set_max_offset(self.max_carrier_offset)
+
+	def get_hs(self):
+		return self.hs
+
+	def set_hs(self, hs):
+		self.hs = hs
+		self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
+
+	def get_gain(self):
+		return self.gain
+
+	def set_gain(self, gain):
+		self.gain = gain
+		self._gain_config = ConfigParser.ConfigParser()
+		self._gain_config.read(self.config_filename)
+		if not self._gain_config.has_section('usrp_rx_hrpt'):
+			self._gain_config.add_section('usrp_rx_hrpt')
+		self._gain_config.set('usrp_rx_hrpt', 'gain', str(self.gain))
+		self._gain_config.write(open(self.config_filename, 'w'))
+
+	def get_freq(self):
+		return self.freq
+
+	def set_freq(self, freq):
+		self.freq = freq
+		self._freq_config = ConfigParser.ConfigParser()
+		self._freq_config.read(self.config_filename)
+		if not self._freq_config.has_section('usrp_rx_hrpt'):
+			self._freq_config.add_section('usrp_rx_hrpt')
+		self._freq_config.set('usrp_rx_hrpt', 'freq', str(self.freq))
+		self._freq_config.write(open(self.config_filename, 'w'))
+
+	def get_clock_alpha(self):
+		return self.clock_alpha
+
+	def set_clock_alpha(self, clock_alpha):
+		self.clock_alpha = clock_alpha
+		self.digital_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0)
+		self.digital_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha)
+		self._clock_alpha_config = ConfigParser.ConfigParser()
+		self._clock_alpha_config.read(self.config_filename)
+		if not self._clock_alpha_config.has_section('usrp_rx_hrpt'):
+			self._clock_alpha_config.add_section('usrp_rx_hrpt')
+		self._clock_alpha_config.set('usrp_rx_hrpt', 'clock_alpha', str(self.clock_alpha))
+		self._clock_alpha_config.write(open(self.config_filename, 'w'))
+
+if __name__ == '__main__':
+	parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
+	(options, args) = parser.parse_args()
+	tb = file_rx_hrpt()
+	tb.start()
+	raw_input('Press Enter to quit: ')
+	tb.stop()
+
diff --git a/gr-noaa/examples/hrpt_decode.grc b/gr-noaa/examples/hrpt_decode.grc
new file mode 100644
index 0000000000..39fe195d15
--- /dev/null
+++ b/gr-noaa/examples/hrpt_decode.grc
@@ -0,0 +1,428 @@
+<?xml version='1.0' encoding='ASCII'?>
+<flow_graph>
+  <timestamp>Sun Nov  8 10:48:59 2009</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>hrpt_decode</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>4096,4096</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>no_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>run</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2*math.pi*100e3/sample_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(575, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(sps/2.0)</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(499, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>64e6/decim</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(198, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>import math, os</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(11, 103)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100e-6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(710, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sym_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>600*1109</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(307, 18)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sps</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>sample_rate/sym_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(400, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>decim</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>decim</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>32</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>intx</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>d</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(202, 102)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>p</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(294, 101)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(395, 101)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_source</key>
+    <param>
+      <key>id</key>
+      <value>file_source</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(231, 419)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_decoder</key>
+    <param>
+      <key>id</key>
+      <value>decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>output</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(462, 419)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>frames.hrpt</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>F</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(522, 100)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>file_source</source_block_id>
+    <sink_block_id>decoder</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-noaa/examples/hrpt_decode.py b/gr-noaa/examples/hrpt_decode.py
new file mode 100755
index 0000000000..158780b17a
--- /dev/null
+++ b/gr-noaa/examples/hrpt_decode.py
@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+##################################################
+# Gnuradio Python Flow Graph
+# Title: Hrpt Decode
+# Generated: Sun Nov  8 10:49:01 2009
+##################################################
+
+from gnuradio import eng_notation
+from gnuradio import gr
+from gnuradio import noaa
+from gnuradio.eng_option import eng_option
+from gnuradio.gr import firdes
+from optparse import OptionParser
+import math, os
+
+class hrpt_decode(gr.top_block):
+
+	def __init__(self, decim=32, pll_alpha=0.01, clock_alpha=0.01, input_filename="frames.hrpt"):
+		gr.top_block.__init__(self, "Hrpt Decode")
+
+		##################################################
+		# Parameters
+		##################################################
+		self.decim = decim
+		self.pll_alpha = pll_alpha
+		self.clock_alpha = clock_alpha
+		self.input_filename = input_filename
+
+		##################################################
+		# Variables
+		##################################################
+		self.sym_rate = sym_rate = 600*1109
+		self.sample_rate = sample_rate = 64e6/decim
+		self.sps = sps = sample_rate/sym_rate
+		self.max_clock_offset = max_clock_offset = 100e-6
+		self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
+		self.hs = hs = int(sps/2.0)
+
+		##################################################
+		# Blocks
+		##################################################
+		self.decoder = noaa.hrpt_decoder(True,True)
+		self.file_source = gr.file_source(gr.sizeof_short*1, input_filename, False)
+
+		##################################################
+		# Connections
+		##################################################
+		self.connect((self.file_source, 0), (self.decoder, 0))
+
+	def set_decim(self, decim):
+		self.decim = decim
+		self.set_sample_rate(64e6/self.decim)
+
+	def set_pll_alpha(self, pll_alpha):
+		self.pll_alpha = pll_alpha
+
+	def set_clock_alpha(self, clock_alpha):
+		self.clock_alpha = clock_alpha
+
+	def set_input_filename(self, input_filename):
+		self.input_filename = input_filename
+
+	def set_sym_rate(self, sym_rate):
+		self.sym_rate = sym_rate
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def set_sample_rate(self, sample_rate):
+		self.sample_rate = sample_rate
+		self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def set_sps(self, sps):
+		self.sps = sps
+		self.set_hs(int(self.sps/2.0))
+
+	def set_max_clock_offset(self, max_clock_offset):
+		self.max_clock_offset = max_clock_offset
+
+	def set_max_carrier_offset(self, max_carrier_offset):
+		self.max_carrier_offset = max_carrier_offset
+
+	def set_hs(self, hs):
+		self.hs = hs
+
+if __name__ == '__main__':
+	parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
+	parser.add_option("-d", "--decim", dest="decim", type="intx", default=32,
+		help="Set decim [default=%default]")
+	parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
+		help="Set pll_alpha [default=%default]")
+	parser.add_option("-s", "--clock-alpha", dest="clock_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
+		help="Set clock_alpha [default=%default]")
+	parser.add_option("-F", "--input-filename", dest="input_filename", type="string", default="frames.hrpt",
+		help="Set frames.hrpt [default=%default]")
+	(options, args) = parser.parse_args()
+	tb = hrpt_decode(decim=options.decim, pll_alpha=options.pll_alpha, clock_alpha=options.clock_alpha, input_filename=options.input_filename)
+	tb.run()
+
diff --git a/gr-noaa/examples/hrpt_demod.grc b/gr-noaa/examples/hrpt_demod.grc
new file mode 100644
index 0000000000..f5833b864c
--- /dev/null
+++ b/gr-noaa/examples/hrpt_demod.grc
@@ -0,0 +1,751 @@
+<?xml version='1.0' encoding='ASCII'?>
+<flow_graph>
+  <timestamp>Thu Oct 27 13:51:57 2011</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>hrpt_demod</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>4096,4096</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>no_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>run</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2*math.pi*100e3/sample_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(575, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(sps/2.0)</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(499, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>import math, os</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(11, 103)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>usrp.dat</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>F</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(618, 102)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>frames.dat</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>o</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(726, 102)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_source</key>
+    <param>
+      <key>id</key>
+      <value>file_source</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>input_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(63, 277)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_interleaved_short_to_complex</key>
+    <param>
+      <key>id</key>
+      <value>cs2cf</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(275, 289)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_agc_xx</key>
+    <param>
+      <key>id</key>
+      <value>agc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>1e-5</value>
+    </param>
+    <param>
+      <key>reference</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1.0/32768.0</value>
+    </param>
+    <param>
+      <key>max_gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(117, 394)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_pll_cf</key>
+    <param>
+      <key>id</key>
+      <value>pll</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>beta</key>
+      <value>pll_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>max_offset</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(292, 402)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100e-6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(710, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sym_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>600*1109</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(307, 18)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sps</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>sample_rate/sym_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(400, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>decim</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>decim</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>32</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>intx</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>d</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(202, 102)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>p</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(294, 101)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(395, 101)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_decoder</key>
+    <param>
+      <key>id</key>
+      <value>decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>output</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1150, 341)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_sink</key>
+    <param>
+      <key>id</key>
+      <value>gr_file_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>unbuffered</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1144, 489)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_moving_average_xx</key>
+    <param>
+      <key>id</key>
+      <value>gr_moving_average_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>length</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0/hs</value>
+    </param>
+    <param>
+      <key>max_iter</key>
+      <value>4000</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(504, 402)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>4e6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(198, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_clock_recovery_mm_xx</key>
+    <param>
+      <key>id</key>
+      <value>digital_clock_recovery_mm_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>omega</key>
+      <value>sps/2.0</value>
+    </param>
+    <param>
+      <key>gain_omega</key>
+      <value>clock_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>gain_mu</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>omega_relative_limit</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(704, 386)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_deframer</key>
+    <param>
+      <key>id</key>
+      <value>noaa_hrpt_deframer_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1142, 422)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_binary_slicer_fb</key>
+    <param>
+      <key>id</key>
+      <value>digital_binary_slicer_fb_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(957, 422)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>file_source</source_block_id>
+    <sink_block_id>cs2cf</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>pll</source_block_id>
+    <sink_block_id>gr_moving_average_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>cs2cf</source_block_id>
+    <sink_block_id>agc</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>agc</source_block_id>
+    <sink_block_id>pll</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>noaa_hrpt_deframer_0</source_block_id>
+    <sink_block_id>gr_file_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>noaa_hrpt_deframer_0</source_block_id>
+    <sink_block_id>decoder</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_moving_average_xx_0</source_block_id>
+    <sink_block_id>digital_clock_recovery_mm_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_clock_recovery_mm_xx_0</source_block_id>
+    <sink_block_id>digital_binary_slicer_fb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_binary_slicer_fb_0</source_block_id>
+    <sink_block_id>noaa_hrpt_deframer_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-noaa/examples/hrpt_demod.py b/gr-noaa/examples/hrpt_demod.py
new file mode 100755
index 0000000000..38b4b2fe34
--- /dev/null
+++ b/gr-noaa/examples/hrpt_demod.py
@@ -0,0 +1,161 @@
+#!/usr/bin/env python
+##################################################
+# Gnuradio Python Flow Graph
+# Title: Hrpt Demod
+# Generated: Thu Oct 27 13:51:59 2011
+##################################################
+
+from gnuradio import digital
+from gnuradio import eng_notation
+from gnuradio import gr
+from gnuradio import noaa
+from gnuradio.eng_option import eng_option
+from gnuradio.gr import firdes
+from optparse import OptionParser
+import math, os
+
+class hrpt_demod(gr.top_block):
+
+	def __init__(self, input_filename="usrp.dat", output_filename="frames.dat", decim=32, pll_alpha=0.01, clock_alpha=0.01):
+		gr.top_block.__init__(self, "Hrpt Demod")
+
+		##################################################
+		# Parameters
+		##################################################
+		self.input_filename = input_filename
+		self.output_filename = output_filename
+		self.decim = decim
+		self.pll_alpha = pll_alpha
+		self.clock_alpha = clock_alpha
+
+		##################################################
+		# Variables
+		##################################################
+		self.sym_rate = sym_rate = 600*1109
+		self.sample_rate = sample_rate = 4e6
+		self.sps = sps = sample_rate/sym_rate
+		self.max_clock_offset = max_clock_offset = 100e-6
+		self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
+		self.hs = hs = int(sps/2.0)
+
+		##################################################
+		# Blocks
+		##################################################
+		self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
+		self.noaa_hrpt_deframer_0 = noaa.hrpt_deframer()
+		self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000)
+		self.gr_file_sink_0 = gr.file_sink(gr.sizeof_short*1, output_filename)
+		self.gr_file_sink_0.set_unbuffered(False)
+		self.file_source = gr.file_source(gr.sizeof_short*1, input_filename, False)
+		self.digital_clock_recovery_mm_xx_0 = digital.clock_recovery_mm_ff(sps/2.0, clock_alpha**2/4.0, 0.5, clock_alpha, max_clock_offset)
+		self.digital_binary_slicer_fb_0 = digital.binary_slicer_fb()
+		self.decoder = noaa.hrpt_decoder(True,False)
+		self.cs2cf = gr.interleaved_short_to_complex()
+		self.agc = gr.agc_cc(1e-5, 1.0, 1.0/32768.0, 1.0)
+
+		##################################################
+		# Connections
+		##################################################
+		self.connect((self.file_source, 0), (self.cs2cf, 0))
+		self.connect((self.pll, 0), (self.gr_moving_average_xx_0, 0))
+		self.connect((self.cs2cf, 0), (self.agc, 0))
+		self.connect((self.agc, 0), (self.pll, 0))
+		self.connect((self.noaa_hrpt_deframer_0, 0), (self.gr_file_sink_0, 0))
+		self.connect((self.noaa_hrpt_deframer_0, 0), (self.decoder, 0))
+		self.connect((self.gr_moving_average_xx_0, 0), (self.digital_clock_recovery_mm_xx_0, 0))
+		self.connect((self.digital_clock_recovery_mm_xx_0, 0), (self.digital_binary_slicer_fb_0, 0))
+		self.connect((self.digital_binary_slicer_fb_0, 0), (self.noaa_hrpt_deframer_0, 0))
+
+	def get_input_filename(self):
+		return self.input_filename
+
+	def set_input_filename(self, input_filename):
+		self.input_filename = input_filename
+
+	def get_output_filename(self):
+		return self.output_filename
+
+	def set_output_filename(self, output_filename):
+		self.output_filename = output_filename
+
+	def get_decim(self):
+		return self.decim
+
+	def set_decim(self, decim):
+		self.decim = decim
+
+	def get_pll_alpha(self):
+		return self.pll_alpha
+
+	def set_pll_alpha(self, pll_alpha):
+		self.pll_alpha = pll_alpha
+		self.pll.set_alpha(self.pll_alpha)
+		self.pll.set_beta(self.pll_alpha**2/4.0)
+
+	def get_clock_alpha(self):
+		return self.clock_alpha
+
+	def set_clock_alpha(self, clock_alpha):
+		self.clock_alpha = clock_alpha
+		self.digital_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0)
+		self.digital_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha)
+
+	def get_sym_rate(self):
+		return self.sym_rate
+
+	def set_sym_rate(self, sym_rate):
+		self.sym_rate = sym_rate
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def get_sample_rate(self):
+		return self.sample_rate
+
+	def set_sample_rate(self, sample_rate):
+		self.sample_rate = sample_rate
+		self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def get_sps(self):
+		return self.sps
+
+	def set_sps(self, sps):
+		self.sps = sps
+		self.set_hs(int(self.sps/2.0))
+		self.digital_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
+
+	def get_max_clock_offset(self):
+		return self.max_clock_offset
+
+	def set_max_clock_offset(self, max_clock_offset):
+		self.max_clock_offset = max_clock_offset
+
+	def get_max_carrier_offset(self):
+		return self.max_carrier_offset
+
+	def set_max_carrier_offset(self, max_carrier_offset):
+		self.max_carrier_offset = max_carrier_offset
+		self.pll.set_max_offset(self.max_carrier_offset)
+
+	def get_hs(self):
+		return self.hs
+
+	def set_hs(self, hs):
+		self.hs = hs
+		self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
+
+if __name__ == '__main__':
+	parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
+	parser.add_option("-F", "--input-filename", dest="input_filename", type="string", default="usrp.dat",
+		help="Set usrp.dat [default=%default]")
+	parser.add_option("-o", "--output-filename", dest="output_filename", type="string", default="frames.dat",
+		help="Set frames.dat [default=%default]")
+	parser.add_option("-d", "--decim", dest="decim", type="intx", default=32,
+		help="Set None [default=%default]")
+	parser.add_option("-p", "--pll-alpha", dest="pll_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
+		help="Set None [default=%default]")
+	parser.add_option("-s", "--clock-alpha", dest="clock_alpha", type="eng_float", default=eng_notation.num_to_str(0.01),
+		help="Set None [default=%default]")
+	(options, args) = parser.parse_args()
+	tb = hrpt_demod(input_filename=options.input_filename, output_filename=options.output_filename, decim=options.decim, pll_alpha=options.pll_alpha, clock_alpha=options.clock_alpha)
+	tb.run()
+
diff --git a/gr-noaa/examples/usrp_rx_hrpt.grc b/gr-noaa/examples/usrp_rx_hrpt.grc
new file mode 100644
index 0000000000..26af48ff0b
--- /dev/null
+++ b/gr-noaa/examples/usrp_rx_hrpt.grc
@@ -0,0 +1,1975 @@
+<?xml version='1.0' encoding='ASCII'?>
+<flow_graph>
+  <timestamp>Thu Oct 27 13:26:39 2011</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>usrp_rx_hrpt</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>USRP HRPT Receiver</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>4096,4096</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>wx_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2*math.pi*100e3/sample_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(575, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sym_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>600*1109</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(301, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sps</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>sample_rate/sym_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(397, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(sps/2.0)</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(499, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>id</key>
+      <value>gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>RX Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>saved_gain</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>0, 1, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(340, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_text_box</key>
+    <param>
+      <key>id</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frequency</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>saved_freq</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>formatter</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>0, 0, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(199, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>id</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>PLL Alpha</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>saved_pll_alpha</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>0, 2, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(479, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>id</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Clock Alpha</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>saved_clock_alpha</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>0, 3, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(618, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>notebook</key>
+    <param>
+      <key>id</key>
+      <value>displays</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.NB_TOP</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>['Spectrum','Demod']</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>2,0,1,4</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(12, 249)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_fftsink2</key>
+    <param>
+      <key>id</key>
+      <value>rx_fft</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>RX Spectrum</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>baseband_freq</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>y_per_div</key>
+      <value>5</value>
+    </param>
+    <param>
+      <key>y_divs</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>ref_level</key>
+      <value>-5</value>
+    </param>
+    <param>
+      <key>ref_scale</key>
+      <value>2.0</value>
+    </param>
+    <param>
+      <key>fft_size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>fft_rate</key>
+      <value>15</value>
+    </param>
+    <param>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>avg_alpha</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>win</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value>640, 360</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>0, 0, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value>displays, 0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(477, 457)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100e-6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(705, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_agc_xx</key>
+    <param>
+      <key>id</key>
+      <value>agc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>1e-6</value>
+    </param>
+    <param>
+      <key>reference</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>max_gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(301, 705)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_pll_cf</key>
+    <param>
+      <key>id</key>
+      <value>pll</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>beta</key>
+      <value>pll_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>max_offset</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(469, 713)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'addr'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(194, 253)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>uhd_usrp_source</key>
+    <param>
+      <key>id</key>
+      <value>uhd_usrp_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>dev_addr</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>sync</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_rate</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>num_mboards</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ref_source0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>nchan</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>center_freq0</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>gain0</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw0</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq11</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain11</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant11</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw11</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq12</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain12</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant12</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw12</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq13</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain13</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant13</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw13</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq14</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain14</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant14</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw14</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq15</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain15</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant15</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw15</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq16</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain16</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant16</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw16</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq17</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain17</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant17</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw17</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq18</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain18</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant18</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw18</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq19</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain19</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant19</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw19</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq20</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain20</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant20</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw20</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq21</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain21</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant21</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw21</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq22</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain22</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant22</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw22</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq23</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain23</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant23</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw23</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq24</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain24</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant24</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw24</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq25</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain25</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant25</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw25</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq26</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain26</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant26</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw26</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq27</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain27</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant27</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw27</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq28</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain28</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant28</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw28</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq29</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain29</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant29</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw29</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq30</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain30</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant30</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw30</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq31</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain31</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant31</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw31</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(49, 713)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_static_text</key>
+    <param>
+      <key>id</key>
+      <value>addr_text</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>USRP Addr</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>str_converter</value>
+    </param>
+    <param>
+      <key>formatter</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>1, 0, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(828, 20)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_static_text</key>
+    <param>
+      <key>id</key>
+      <value>rate_text</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Baseband Rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>formatter</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>1, 1, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(973, 20)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>import math, os</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(9, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>os.environ['HOME']+'/.gnuradio/config.conf'</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(13, 168)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'frames.hrpt'</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'filename'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(990, 255)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>saved_clock_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'clock_alpha'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(832, 254)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>saved_pll_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'pll_alpha'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(674, 254)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>saved_gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>35</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'gain'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>gain</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(515, 255)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>saved_freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1698e6</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'freq'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(358, 254)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>4e6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(198, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>wxgui_scopesink2</key>
+    <param>
+      <key>id</key>
+      <value>demod_scope</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Post-Demod</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>sym_rate*2.0</value>
+    </param>
+    <param>
+      <key>v_scale</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>v_offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>t_scale</key>
+      <value>10.0/sym_rate</value>
+    </param>
+    <param>
+      <key>ac_couple</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>xy_mode</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value>0, 0, 1, 1</value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value>displays, 1</value>
+    </param>
+    <param>
+      <key>trig_mode</key>
+      <value>gr.gr_TRIG_MODE_AUTO</value>
+    </param>
+    <param>
+      <key>y_axis_label</key>
+      <value>Counts</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(666, 542)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_moving_average_xx</key>
+    <param>
+      <key>id</key>
+      <value>gr_moving_average_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>length</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0/hs</value>
+    </param>
+    <param>
+      <key>max_iter</key>
+      <value>4000</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(682, 713)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_sink</key>
+    <param>
+      <key>id</key>
+      <value>virtual_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>baseband</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1138, 729)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_clock_recovery_mm_xx</key>
+    <param>
+      <key>id</key>
+      <value>digital_clock_recovery_mm_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>omega</key>
+      <value>sps/2.0</value>
+    </param>
+    <param>
+      <key>gain_omega</key>
+      <value>clock_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>gain_mu</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>omega_relative_limit</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(896, 697)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>baseband</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(173, 971)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_binary_slicer_fb</key>
+    <param>
+      <key>id</key>
+      <value>digital_binary_slicer_fb_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(423, 975)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_deframer</key>
+    <param>
+      <key>id</key>
+      <value>deframer</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(762, 975)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_decoder</key>
+    <param>
+      <key>id</key>
+      <value>decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>output</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(974, 925)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_sink</key>
+    <param>
+      <key>id</key>
+      <value>frame_sink</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>unbuffered</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(973, 1024)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>deframer</source_block_id>
+    <sink_block_id>frame_sink</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>deframer</source_block_id>
+    <sink_block_id>decoder</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>agc</source_block_id>
+    <sink_block_id>pll</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>agc</source_block_id>
+    <sink_block_id>rx_fft</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>uhd_usrp_source_0</source_block_id>
+    <sink_block_id>agc</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>pll</source_block_id>
+    <sink_block_id>gr_moving_average_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_moving_average_xx_0</source_block_id>
+    <sink_block_id>demod_scope</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_moving_average_xx_0</source_block_id>
+    <sink_block_id>digital_clock_recovery_mm_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_clock_recovery_mm_xx_0</source_block_id>
+    <sink_block_id>virtual_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0</source_block_id>
+    <sink_block_id>digital_binary_slicer_fb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_binary_slicer_fb_0</source_block_id>
+    <sink_block_id>deframer</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-noaa/examples/usrp_rx_hrpt.py b/gr-noaa/examples/usrp_rx_hrpt.py
new file mode 100755
index 0000000000..e603e768e9
--- /dev/null
+++ b/gr-noaa/examples/usrp_rx_hrpt.py
@@ -0,0 +1,462 @@
+#!/usr/bin/env python
+##################################################
+# Gnuradio Python Flow Graph
+# Title: USRP HRPT Receiver
+# Generated: Thu Oct 27 13:26:42 2011
+##################################################
+
+from gnuradio import digital
+from gnuradio import eng_notation
+from gnuradio import gr
+from gnuradio import noaa
+from gnuradio import uhd
+from gnuradio import window
+from gnuradio.eng_option import eng_option
+from gnuradio.gr import firdes
+from gnuradio.wxgui import fftsink2
+from gnuradio.wxgui import forms
+from gnuradio.wxgui import scopesink2
+from grc_gnuradio import wxgui as grc_wxgui
+from optparse import OptionParser
+import ConfigParser
+import math, os
+import wx
+
+class usrp_rx_hrpt(grc_wxgui.top_block_gui):
+
+	def __init__(self):
+		grc_wxgui.top_block_gui.__init__(self, title="USRP HRPT Receiver")
+
+		##################################################
+		# Variables
+		##################################################
+		self.sym_rate = sym_rate = 600*1109
+		self.sample_rate = sample_rate = 4e6
+		self.config_filename = config_filename = os.environ['HOME']+'/.gnuradio/config.conf'
+		self.sps = sps = sample_rate/sym_rate
+		self._saved_pll_alpha_config = ConfigParser.ConfigParser()
+		self._saved_pll_alpha_config.read(config_filename)
+		try: saved_pll_alpha = self._saved_pll_alpha_config.getfloat('usrp_rx_hrpt', 'pll_alpha')
+		except: saved_pll_alpha = 0.01
+		self.saved_pll_alpha = saved_pll_alpha
+		self._saved_gain_config = ConfigParser.ConfigParser()
+		self._saved_gain_config.read(config_filename)
+		try: saved_gain = self._saved_gain_config.getfloat('usrp_rx_hrpt', 'gain')
+		except: saved_gain = 35
+		self.saved_gain = saved_gain
+		self._saved_freq_config = ConfigParser.ConfigParser()
+		self._saved_freq_config.read(config_filename)
+		try: saved_freq = self._saved_freq_config.getfloat('usrp_rx_hrpt', 'freq')
+		except: saved_freq = 1698e6
+		self.saved_freq = saved_freq
+		self._saved_clock_alpha_config = ConfigParser.ConfigParser()
+		self._saved_clock_alpha_config.read(config_filename)
+		try: saved_clock_alpha = self._saved_clock_alpha_config.getfloat('usrp_rx_hrpt', 'clock_alpha')
+		except: saved_clock_alpha = 0.01
+		self.saved_clock_alpha = saved_clock_alpha
+		self._addr_config = ConfigParser.ConfigParser()
+		self._addr_config.read(config_filename)
+		try: addr = self._addr_config.get('usrp_rx_hrpt', 'addr')
+		except: addr = ""
+		self.addr = addr
+		self.rate_text = rate_text = sample_rate
+		self.pll_alpha = pll_alpha = saved_pll_alpha
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(config_filename)
+		try: output_filename = self._output_filename_config.get('usrp_rx_hrpt', 'filename')
+		except: output_filename = 'frames.hrpt'
+		self.output_filename = output_filename
+		self.max_clock_offset = max_clock_offset = 100e-6
+		self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
+		self.hs = hs = int(sps/2.0)
+		self.gain = gain = saved_gain
+		self.freq = freq = saved_freq
+		self.clock_alpha = clock_alpha = saved_clock_alpha
+		self.addr_text = addr_text = addr
+
+		##################################################
+		# Blocks
+		##################################################
+		self._freq_text_box = forms.text_box(
+			parent=self.GetWin(),
+			value=self.freq,
+			callback=self.set_freq,
+			label="Frequency",
+			converter=forms.float_converter(),
+		)
+		self.GridAdd(self._freq_text_box, 0, 0, 1, 1)
+		self.displays = self.displays = wx.Notebook(self.GetWin(), style=wx.NB_TOP)
+		self.displays.AddPage(grc_wxgui.Panel(self.displays), "Spectrum")
+		self.displays.AddPage(grc_wxgui.Panel(self.displays), "Demod")
+		self.GridAdd(self.displays, 2, 0, 1, 4)
+		_clock_alpha_sizer = wx.BoxSizer(wx.VERTICAL)
+		self._clock_alpha_text_box = forms.text_box(
+			parent=self.GetWin(),
+			sizer=_clock_alpha_sizer,
+			value=self.clock_alpha,
+			callback=self.set_clock_alpha,
+			label="Clock Alpha",
+			converter=forms.float_converter(),
+			proportion=0,
+		)
+		self._clock_alpha_slider = forms.slider(
+			parent=self.GetWin(),
+			sizer=_clock_alpha_sizer,
+			value=self.clock_alpha,
+			callback=self.set_clock_alpha,
+			minimum=0.0,
+			maximum=0.5,
+			num_steps=100,
+			style=wx.SL_HORIZONTAL,
+			cast=float,
+			proportion=1,
+		)
+		self.GridAdd(_clock_alpha_sizer, 0, 3, 1, 1)
+		self.uhd_usrp_source_0 = uhd.usrp_source(
+			device_addr=addr,
+			io_type=uhd.io_type.COMPLEX_FLOAT32,
+			num_channels=1,
+		)
+		self.uhd_usrp_source_0.set_samp_rate(sample_rate)
+		self.uhd_usrp_source_0.set_center_freq(freq, 0)
+		self.uhd_usrp_source_0.set_gain(0, 0)
+		self.rx_fft = fftsink2.fft_sink_c(
+			self.displays.GetPage(0).GetWin(),
+			baseband_freq=freq,
+			y_per_div=5,
+			y_divs=8,
+			ref_level=-5,
+			ref_scale=2.0,
+			sample_rate=sample_rate,
+			fft_size=1024,
+			fft_rate=15,
+			average=True,
+			avg_alpha=0.1,
+			title="RX Spectrum",
+			peak_hold=False,
+			size=(640, 360),
+		)
+		self.displays.GetPage(0).GridAdd(self.rx_fft.win, 0, 0, 1, 1)
+		self._rate_text_static_text = forms.static_text(
+			parent=self.GetWin(),
+			value=self.rate_text,
+			callback=self.set_rate_text,
+			label="Baseband Rate",
+			converter=forms.float_converter(),
+		)
+		self.GridAdd(self._rate_text_static_text, 1, 1, 1, 1)
+		_pll_alpha_sizer = wx.BoxSizer(wx.VERTICAL)
+		self._pll_alpha_text_box = forms.text_box(
+			parent=self.GetWin(),
+			sizer=_pll_alpha_sizer,
+			value=self.pll_alpha,
+			callback=self.set_pll_alpha,
+			label="PLL Alpha",
+			converter=forms.float_converter(),
+			proportion=0,
+		)
+		self._pll_alpha_slider = forms.slider(
+			parent=self.GetWin(),
+			sizer=_pll_alpha_sizer,
+			value=self.pll_alpha,
+			callback=self.set_pll_alpha,
+			minimum=0.0,
+			maximum=0.5,
+			num_steps=100,
+			style=wx.SL_HORIZONTAL,
+			cast=float,
+			proportion=1,
+		)
+		self.GridAdd(_pll_alpha_sizer, 0, 2, 1, 1)
+		self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
+		self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000)
+		_gain_sizer = wx.BoxSizer(wx.VERTICAL)
+		self._gain_text_box = forms.text_box(
+			parent=self.GetWin(),
+			sizer=_gain_sizer,
+			value=self.gain,
+			callback=self.set_gain,
+			label="RX Gain",
+			converter=forms.float_converter(),
+			proportion=0,
+		)
+		self._gain_slider = forms.slider(
+			parent=self.GetWin(),
+			sizer=_gain_sizer,
+			value=self.gain,
+			callback=self.set_gain,
+			minimum=0,
+			maximum=100,
+			num_steps=100,
+			style=wx.SL_HORIZONTAL,
+			cast=float,
+			proportion=1,
+		)
+		self.GridAdd(_gain_sizer, 0, 1, 1, 1)
+		self.frame_sink = gr.file_sink(gr.sizeof_short*1, output_filename)
+		self.frame_sink.set_unbuffered(False)
+		self.digital_clock_recovery_mm_xx_0 = digital.clock_recovery_mm_ff(sps/2.0, clock_alpha**2/4.0, 0.5, clock_alpha, max_clock_offset)
+		self.digital_binary_slicer_fb_0 = digital.binary_slicer_fb()
+		self.demod_scope = scopesink2.scope_sink_f(
+			self.displays.GetPage(1).GetWin(),
+			title="Post-Demod",
+			sample_rate=sym_rate*2.0,
+			v_scale=0.5,
+			v_offset=0,
+			t_scale=10.0/sym_rate,
+			ac_couple=False,
+			xy_mode=False,
+			num_inputs=1,
+			trig_mode=gr.gr_TRIG_MODE_AUTO,
+			y_axis_label="Counts",
+		)
+		self.displays.GetPage(1).GridAdd(self.demod_scope.win, 0, 0, 1, 1)
+		self.deframer = noaa.hrpt_deframer()
+		self.decoder = noaa.hrpt_decoder(True,True)
+		self.agc = gr.agc_cc(1e-6, 1.0, 1.0, 1.0)
+		self._addr_text_static_text = forms.static_text(
+			parent=self.GetWin(),
+			value=self.addr_text,
+			callback=self.set_addr_text,
+			label="USRP Addr",
+			converter=forms.str_converter(),
+		)
+		self.GridAdd(self._addr_text_static_text, 1, 0, 1, 1)
+
+		##################################################
+		# Connections
+		##################################################
+		self.connect((self.deframer, 0), (self.frame_sink, 0))
+		self.connect((self.deframer, 0), (self.decoder, 0))
+		self.connect((self.agc, 0), (self.pll, 0))
+		self.connect((self.agc, 0), (self.rx_fft, 0))
+		self.connect((self.uhd_usrp_source_0, 0), (self.agc, 0))
+		self.connect((self.pll, 0), (self.gr_moving_average_xx_0, 0))
+		self.connect((self.gr_moving_average_xx_0, 0), (self.demod_scope, 0))
+		self.connect((self.gr_moving_average_xx_0, 0), (self.digital_clock_recovery_mm_xx_0, 0))
+		self.connect((self.digital_clock_recovery_mm_xx_0, 0), (self.digital_binary_slicer_fb_0, 0))
+		self.connect((self.digital_binary_slicer_fb_0, 0), (self.deframer, 0))
+
+	def get_sym_rate(self):
+		return self.sym_rate
+
+	def set_sym_rate(self, sym_rate):
+		self.sym_rate = sym_rate
+		self.set_sps(self.sample_rate/self.sym_rate)
+		self.demod_scope.set_sample_rate(self.sym_rate*2.0)
+
+	def get_sample_rate(self):
+		return self.sample_rate
+
+	def set_sample_rate(self, sample_rate):
+		self.sample_rate = sample_rate
+		self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
+		self.set_sps(self.sample_rate/self.sym_rate)
+		self.rx_fft.set_sample_rate(self.sample_rate)
+		self.uhd_usrp_source_0.set_samp_rate(self.sample_rate)
+		self.set_rate_text(self.sample_rate)
+
+	def get_config_filename(self):
+		return self.config_filename
+
+	def set_config_filename(self, config_filename):
+		self.config_filename = config_filename
+		self._addr_config = ConfigParser.ConfigParser()
+		self._addr_config.read(self.config_filename)
+		if not self._addr_config.has_section('usrp_rx_hrpt'):
+			self._addr_config.add_section('usrp_rx_hrpt')
+		self._addr_config.set('usrp_rx_hrpt', 'addr', str(self.addr))
+		self._addr_config.write(open(self.config_filename, 'w'))
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(self.config_filename)
+		if not self._output_filename_config.has_section('usrp_rx_hrpt'):
+			self._output_filename_config.add_section('usrp_rx_hrpt')
+		self._output_filename_config.set('usrp_rx_hrpt', 'filename', str(self.output_filename))
+		self._output_filename_config.write(open(self.config_filename, 'w'))
+		self._saved_clock_alpha_config = ConfigParser.ConfigParser()
+		self._saved_clock_alpha_config.read(self.config_filename)
+		if not self._saved_clock_alpha_config.has_section('usrp_rx_hrpt'):
+			self._saved_clock_alpha_config.add_section('usrp_rx_hrpt')
+		self._saved_clock_alpha_config.set('usrp_rx_hrpt', 'clock_alpha', str(self.clock_alpha))
+		self._saved_clock_alpha_config.write(open(self.config_filename, 'w'))
+		self._saved_pll_alpha_config = ConfigParser.ConfigParser()
+		self._saved_pll_alpha_config.read(self.config_filename)
+		if not self._saved_pll_alpha_config.has_section('usrp_rx_hrpt'):
+			self._saved_pll_alpha_config.add_section('usrp_rx_hrpt')
+		self._saved_pll_alpha_config.set('usrp_rx_hrpt', 'pll_alpha', str(self.pll_alpha))
+		self._saved_pll_alpha_config.write(open(self.config_filename, 'w'))
+		self._saved_gain_config = ConfigParser.ConfigParser()
+		self._saved_gain_config.read(self.config_filename)
+		if not self._saved_gain_config.has_section('usrp_rx_hrpt'):
+			self._saved_gain_config.add_section('usrp_rx_hrpt')
+		self._saved_gain_config.set('usrp_rx_hrpt', 'gain', str(self.gain))
+		self._saved_gain_config.write(open(self.config_filename, 'w'))
+		self._saved_freq_config = ConfigParser.ConfigParser()
+		self._saved_freq_config.read(self.config_filename)
+		if not self._saved_freq_config.has_section('usrp_rx_hrpt'):
+			self._saved_freq_config.add_section('usrp_rx_hrpt')
+		self._saved_freq_config.set('usrp_rx_hrpt', 'freq', str(self.freq))
+		self._saved_freq_config.write(open(self.config_filename, 'w'))
+
+	def get_sps(self):
+		return self.sps
+
+	def set_sps(self, sps):
+		self.sps = sps
+		self.set_hs(int(self.sps/2.0))
+		self.digital_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
+
+	def get_saved_pll_alpha(self):
+		return self.saved_pll_alpha
+
+	def set_saved_pll_alpha(self, saved_pll_alpha):
+		self.saved_pll_alpha = saved_pll_alpha
+		self.set_pll_alpha(self.saved_pll_alpha)
+
+	def get_saved_gain(self):
+		return self.saved_gain
+
+	def set_saved_gain(self, saved_gain):
+		self.saved_gain = saved_gain
+		self.set_gain(self.saved_gain)
+
+	def get_saved_freq(self):
+		return self.saved_freq
+
+	def set_saved_freq(self, saved_freq):
+		self.saved_freq = saved_freq
+		self.set_freq(self.saved_freq)
+
+	def get_saved_clock_alpha(self):
+		return self.saved_clock_alpha
+
+	def set_saved_clock_alpha(self, saved_clock_alpha):
+		self.saved_clock_alpha = saved_clock_alpha
+		self.set_clock_alpha(self.saved_clock_alpha)
+
+	def get_addr(self):
+		return self.addr
+
+	def set_addr(self, addr):
+		self.addr = addr
+		self._addr_config = ConfigParser.ConfigParser()
+		self._addr_config.read(self.config_filename)
+		if not self._addr_config.has_section('usrp_rx_hrpt'):
+			self._addr_config.add_section('usrp_rx_hrpt')
+		self._addr_config.set('usrp_rx_hrpt', 'addr', str(self.addr))
+		self._addr_config.write(open(self.config_filename, 'w'))
+		self.set_addr_text(self.addr)
+
+	def get_rate_text(self):
+		return self.rate_text
+
+	def set_rate_text(self, rate_text):
+		self.rate_text = rate_text
+		self._rate_text_static_text.set_value(self.rate_text)
+
+	def get_pll_alpha(self):
+		return self.pll_alpha
+
+	def set_pll_alpha(self, pll_alpha):
+		self.pll_alpha = pll_alpha
+		self._pll_alpha_slider.set_value(self.pll_alpha)
+		self._pll_alpha_text_box.set_value(self.pll_alpha)
+		self.pll.set_alpha(self.pll_alpha)
+		self.pll.set_beta(self.pll_alpha**2/4.0)
+		self._saved_pll_alpha_config = ConfigParser.ConfigParser()
+		self._saved_pll_alpha_config.read(self.config_filename)
+		if not self._saved_pll_alpha_config.has_section('usrp_rx_hrpt'):
+			self._saved_pll_alpha_config.add_section('usrp_rx_hrpt')
+		self._saved_pll_alpha_config.set('usrp_rx_hrpt', 'pll_alpha', str(self.pll_alpha))
+		self._saved_pll_alpha_config.write(open(self.config_filename, 'w'))
+
+	def get_output_filename(self):
+		return self.output_filename
+
+	def set_output_filename(self, output_filename):
+		self.output_filename = output_filename
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(self.config_filename)
+		if not self._output_filename_config.has_section('usrp_rx_hrpt'):
+			self._output_filename_config.add_section('usrp_rx_hrpt')
+		self._output_filename_config.set('usrp_rx_hrpt', 'filename', str(self.output_filename))
+		self._output_filename_config.write(open(self.config_filename, 'w'))
+
+	def get_max_clock_offset(self):
+		return self.max_clock_offset
+
+	def set_max_clock_offset(self, max_clock_offset):
+		self.max_clock_offset = max_clock_offset
+
+	def get_max_carrier_offset(self):
+		return self.max_carrier_offset
+
+	def set_max_carrier_offset(self, max_carrier_offset):
+		self.max_carrier_offset = max_carrier_offset
+		self.pll.set_max_offset(self.max_carrier_offset)
+
+	def get_hs(self):
+		return self.hs
+
+	def set_hs(self, hs):
+		self.hs = hs
+		self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
+
+	def get_gain(self):
+		return self.gain
+
+	def set_gain(self, gain):
+		self.gain = gain
+		self._gain_slider.set_value(self.gain)
+		self._gain_text_box.set_value(self.gain)
+		self._saved_gain_config = ConfigParser.ConfigParser()
+		self._saved_gain_config.read(self.config_filename)
+		if not self._saved_gain_config.has_section('usrp_rx_hrpt'):
+			self._saved_gain_config.add_section('usrp_rx_hrpt')
+		self._saved_gain_config.set('usrp_rx_hrpt', 'gain', str(self.gain))
+		self._saved_gain_config.write(open(self.config_filename, 'w'))
+
+	def get_freq(self):
+		return self.freq
+
+	def set_freq(self, freq):
+		self.freq = freq
+		self._freq_text_box.set_value(self.freq)
+		self.rx_fft.set_baseband_freq(self.freq)
+		self.uhd_usrp_source_0.set_center_freq(self.freq, 0)
+		self._saved_freq_config = ConfigParser.ConfigParser()
+		self._saved_freq_config.read(self.config_filename)
+		if not self._saved_freq_config.has_section('usrp_rx_hrpt'):
+			self._saved_freq_config.add_section('usrp_rx_hrpt')
+		self._saved_freq_config.set('usrp_rx_hrpt', 'freq', str(self.freq))
+		self._saved_freq_config.write(open(self.config_filename, 'w'))
+
+	def get_clock_alpha(self):
+		return self.clock_alpha
+
+	def set_clock_alpha(self, clock_alpha):
+		self.clock_alpha = clock_alpha
+		self._clock_alpha_slider.set_value(self.clock_alpha)
+		self._clock_alpha_text_box.set_value(self.clock_alpha)
+		self._saved_clock_alpha_config = ConfigParser.ConfigParser()
+		self._saved_clock_alpha_config.read(self.config_filename)
+		if not self._saved_clock_alpha_config.has_section('usrp_rx_hrpt'):
+			self._saved_clock_alpha_config.add_section('usrp_rx_hrpt')
+		self._saved_clock_alpha_config.set('usrp_rx_hrpt', 'clock_alpha', str(self.clock_alpha))
+		self._saved_clock_alpha_config.write(open(self.config_filename, 'w'))
+		self.digital_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0)
+		self.digital_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha)
+
+	def get_addr_text(self):
+		return self.addr_text
+
+	def set_addr_text(self, addr_text):
+		self.addr_text = addr_text
+		self._addr_text_static_text.set_value(self.addr_text)
+
+if __name__ == '__main__':
+	parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
+	(options, args) = parser.parse_args()
+	tb = usrp_rx_hrpt()
+	tb.Run(True)
+
diff --git a/gr-noaa/examples/usrp_rx_hrpt_nogui.grc b/gr-noaa/examples/usrp_rx_hrpt_nogui.grc
new file mode 100644
index 0000000000..5936c94c83
--- /dev/null
+++ b/gr-noaa/examples/usrp_rx_hrpt_nogui.grc
@@ -0,0 +1,1472 @@
+<?xml version='1.0' encoding='ASCII'?>
+<flow_graph>
+  <timestamp>Thu Oct 27 13:48:57 2011</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>usrp_rx_hrpt_nogui</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>USRP HRPT Receiver</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>4096,4096</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>no_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2*math.pi*100e3/sample_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(575, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sym_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>600*1109</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(301, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sps</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>sample_rate/sym_rate</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(397, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(sps/2.0)</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(499, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100e-6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(705, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>import math, os</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(9, 106)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>os.environ['HOME']+'/.gnuradio/config.conf'</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(13, 168)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>4e6</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(198, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'clock_alpha'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(833, 104)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'pll_alpha'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(675, 104)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>35</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'gain'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>gain</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(516, 105)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1698e6</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'freq'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(359, 104)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'frames.hrpt'</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'filename'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(991, 105)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_clock_recovery_mm_xx</key>
+    <param>
+      <key>id</key>
+      <value>digital_clock_recovery_mm_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>omega</key>
+      <value>sps/2.0</value>
+    </param>
+    <param>
+      <key>gain_omega</key>
+      <value>clock_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>gain_mu</key>
+      <value>clock_alpha</value>
+    </param>
+    <param>
+      <key>omega_relative_limit</key>
+      <value>max_clock_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(897, 341)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_sink</key>
+    <param>
+      <key>id</key>
+      <value>virtual_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>baseband</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1139, 373)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>uhd_usrp_source</key>
+    <param>
+      <key>id</key>
+      <value>uhd_usrp_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>dev_addr</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>sync</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_rate</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>num_mboards</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ref_source0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ref_source7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>nchan</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>sample_rate</value>
+    </param>
+    <param>
+      <key>center_freq0</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>gain0</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw0</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq11</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain11</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant11</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw11</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq12</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain12</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant12</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw12</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq13</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain13</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant13</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw13</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq14</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain14</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant14</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw14</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq15</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain15</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant15</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw15</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq16</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain16</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant16</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw16</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq17</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain17</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant17</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw17</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq18</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain18</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant18</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw18</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq19</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain19</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant19</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw19</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq20</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain20</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant20</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw20</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq21</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain21</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant21</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw21</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq22</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain22</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant22</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw22</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq23</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain23</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant23</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw23</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq24</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain24</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant24</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw24</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq25</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain25</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant25</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw25</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq26</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain26</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant26</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw26</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq27</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain27</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant27</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw27</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq28</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain28</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant28</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw28</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq29</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain29</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant29</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw29</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq30</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain30</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant30</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw30</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>center_freq31</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>gain31</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ant31</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bw31</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(50, 357)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_pll_cf</key>
+    <param>
+      <key>id</key>
+      <value>pll</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha</key>
+      <value>pll_alpha</value>
+    </param>
+    <param>
+      <key>beta</key>
+      <value>pll_alpha**2/4.0</value>
+    </param>
+    <param>
+      <key>max_offset</key>
+      <value>max_carrier_offset</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(470, 357)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_agc_xx</key>
+    <param>
+      <key>id</key>
+      <value>agc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>1e-6</value>
+    </param>
+    <param>
+      <key>reference</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>max_gain</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(302, 349)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_moving_average_xx</key>
+    <param>
+      <key>id</key>
+      <value>gr_moving_average_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>length</key>
+      <value>hs</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0/hs</value>
+    </param>
+    <param>
+      <key>max_iter</key>
+      <value>4000</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(683, 357)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>gr_file_sink</key>
+    <param>
+      <key>id</key>
+      <value>frame_sink</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>file</key>
+      <value>output_filename</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>unbuffered</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(809, 595)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_deframer</key>
+    <param>
+      <key>id</key>
+      <value>deframer</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(598, 546)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_binary_slicer_fb</key>
+    <param>
+      <key>id</key>
+      <value>digital_binary_slicer_fb_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(259, 546)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>baseband</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(40, 542)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>noaa_hrpt_decoder</key>
+    <param>
+      <key>id</key>
+      <value>decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>output</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(810, 496)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_config</key>
+    <param>
+      <key>id</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>config_file</key>
+      <value>config_filename</value>
+    </param>
+    <param>
+      <key>section</key>
+      <value>'usrp_rx_hrpt'</value>
+    </param>
+    <param>
+      <key>option</key>
+      <value>'addr'</value>
+    </param>
+    <param>
+      <key>writeback</key>
+      <value>addr</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(195, 103)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>digital_clock_recovery_mm_xx_0</source_block_id>
+    <sink_block_id>virtual_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>gr_moving_average_xx_0</source_block_id>
+    <sink_block_id>digital_clock_recovery_mm_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>pll</source_block_id>
+    <sink_block_id>gr_moving_average_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>uhd_usrp_source_0</source_block_id>
+    <sink_block_id>agc</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>agc</source_block_id>
+    <sink_block_id>pll</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_binary_slicer_fb_0</source_block_id>
+    <sink_block_id>deframer</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0</source_block_id>
+    <sink_block_id>digital_binary_slicer_fb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>deframer</source_block_id>
+    <sink_block_id>decoder</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>deframer</source_block_id>
+    <sink_block_id>frame_sink</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-noaa/examples/usrp_rx_hrpt_nogui.py b/gr-noaa/examples/usrp_rx_hrpt_nogui.py
new file mode 100755
index 0000000000..4fc5642ffa
--- /dev/null
+++ b/gr-noaa/examples/usrp_rx_hrpt_nogui.py
@@ -0,0 +1,268 @@
+#!/usr/bin/env python
+##################################################
+# Gnuradio Python Flow Graph
+# Title: USRP HRPT Receiver
+# Generated: Thu Oct 27 13:49:01 2011
+##################################################
+
+from gnuradio import digital
+from gnuradio import eng_notation
+from gnuradio import gr
+from gnuradio import noaa
+from gnuradio import uhd
+from gnuradio.eng_option import eng_option
+from gnuradio.gr import firdes
+from optparse import OptionParser
+import ConfigParser
+import math, os
+
+class usrp_rx_hrpt_nogui(gr.top_block):
+
+	def __init__(self):
+		gr.top_block.__init__(self, "USRP HRPT Receiver")
+
+		##################################################
+		# Variables
+		##################################################
+		self.sym_rate = sym_rate = 600*1109
+		self.sample_rate = sample_rate = 4e6
+		self.sps = sps = sample_rate/sym_rate
+		self.config_filename = config_filename = os.environ['HOME']+'/.gnuradio/config.conf'
+		self._pll_alpha_config = ConfigParser.ConfigParser()
+		self._pll_alpha_config.read(config_filename)
+		try: pll_alpha = self._pll_alpha_config.getfloat('usrp_rx_hrpt', 'pll_alpha')
+		except: pll_alpha = 0.01
+		self.pll_alpha = pll_alpha
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(config_filename)
+		try: output_filename = self._output_filename_config.get('usrp_rx_hrpt', 'filename')
+		except: output_filename = 'frames.hrpt'
+		self.output_filename = output_filename
+		self.max_clock_offset = max_clock_offset = 100e-6
+		self.max_carrier_offset = max_carrier_offset = 2*math.pi*100e3/sample_rate
+		self.hs = hs = int(sps/2.0)
+		self._gain_config = ConfigParser.ConfigParser()
+		self._gain_config.read(config_filename)
+		try: gain = self._gain_config.getfloat('usrp_rx_hrpt', 'gain')
+		except: gain = 35
+		self.gain = gain
+		self._freq_config = ConfigParser.ConfigParser()
+		self._freq_config.read(config_filename)
+		try: freq = self._freq_config.getfloat('usrp_rx_hrpt', 'freq')
+		except: freq = 1698e6
+		self.freq = freq
+		self._clock_alpha_config = ConfigParser.ConfigParser()
+		self._clock_alpha_config.read(config_filename)
+		try: clock_alpha = self._clock_alpha_config.getfloat('usrp_rx_hrpt', 'clock_alpha')
+		except: clock_alpha = 0.01
+		self.clock_alpha = clock_alpha
+		self._addr_config = ConfigParser.ConfigParser()
+		self._addr_config.read(config_filename)
+		try: addr = self._addr_config.get('usrp_rx_hrpt', 'addr')
+		except: addr = ""
+		self.addr = addr
+
+		##################################################
+		# Blocks
+		##################################################
+		self.uhd_usrp_source_0 = uhd.usrp_source(
+			device_addr=addr,
+			io_type=uhd.io_type.COMPLEX_FLOAT32,
+			num_channels=1,
+		)
+		self.uhd_usrp_source_0.set_samp_rate(sample_rate)
+		self.uhd_usrp_source_0.set_center_freq(freq, 0)
+		self.uhd_usrp_source_0.set_gain(0, 0)
+		self.pll = noaa.hrpt_pll_cf(pll_alpha, pll_alpha**2/4.0, max_carrier_offset)
+		self.gr_moving_average_xx_0 = gr.moving_average_ff(hs, 1.0/hs, 4000)
+		self.frame_sink = gr.file_sink(gr.sizeof_short*1, output_filename)
+		self.frame_sink.set_unbuffered(False)
+		self.digital_clock_recovery_mm_xx_0 = digital.clock_recovery_mm_ff(sps/2.0, clock_alpha**2/4.0, 0.5, clock_alpha, max_clock_offset)
+		self.digital_binary_slicer_fb_0 = digital.binary_slicer_fb()
+		self.deframer = noaa.hrpt_deframer()
+		self.decoder = noaa.hrpt_decoder(True,True)
+		self.agc = gr.agc_cc(1e-6, 1.0, 1.0, 1.0)
+
+		##################################################
+		# Connections
+		##################################################
+		self.connect((self.gr_moving_average_xx_0, 0), (self.digital_clock_recovery_mm_xx_0, 0))
+		self.connect((self.pll, 0), (self.gr_moving_average_xx_0, 0))
+		self.connect((self.uhd_usrp_source_0, 0), (self.agc, 0))
+		self.connect((self.agc, 0), (self.pll, 0))
+		self.connect((self.digital_binary_slicer_fb_0, 0), (self.deframer, 0))
+		self.connect((self.digital_clock_recovery_mm_xx_0, 0), (self.digital_binary_slicer_fb_0, 0))
+		self.connect((self.deframer, 0), (self.decoder, 0))
+		self.connect((self.deframer, 0), (self.frame_sink, 0))
+
+	def get_sym_rate(self):
+		return self.sym_rate
+
+	def set_sym_rate(self, sym_rate):
+		self.sym_rate = sym_rate
+		self.set_sps(self.sample_rate/self.sym_rate)
+
+	def get_sample_rate(self):
+		return self.sample_rate
+
+	def set_sample_rate(self, sample_rate):
+		self.sample_rate = sample_rate
+		self.set_max_carrier_offset(2*math.pi*100e3/self.sample_rate)
+		self.set_sps(self.sample_rate/self.sym_rate)
+		self.uhd_usrp_source_0.set_samp_rate(self.sample_rate)
+
+	def get_sps(self):
+		return self.sps
+
+	def set_sps(self, sps):
+		self.sps = sps
+		self.set_hs(int(self.sps/2.0))
+		self.digital_clock_recovery_mm_xx_0.set_omega(self.sps/2.0)
+
+	def get_config_filename(self):
+		return self.config_filename
+
+	def set_config_filename(self, config_filename):
+		self.config_filename = config_filename
+		self._clock_alpha_config = ConfigParser.ConfigParser()
+		self._clock_alpha_config.read(self.config_filename)
+		if not self._clock_alpha_config.has_section('usrp_rx_hrpt'):
+			self._clock_alpha_config.add_section('usrp_rx_hrpt')
+		self._clock_alpha_config.set('usrp_rx_hrpt', 'clock_alpha', str(self.clock_alpha))
+		self._clock_alpha_config.write(open(self.config_filename, 'w'))
+		self._pll_alpha_config = ConfigParser.ConfigParser()
+		self._pll_alpha_config.read(self.config_filename)
+		if not self._pll_alpha_config.has_section('usrp_rx_hrpt'):
+			self._pll_alpha_config.add_section('usrp_rx_hrpt')
+		self._pll_alpha_config.set('usrp_rx_hrpt', 'pll_alpha', str(self.pll_alpha))
+		self._pll_alpha_config.write(open(self.config_filename, 'w'))
+		self._gain_config = ConfigParser.ConfigParser()
+		self._gain_config.read(self.config_filename)
+		if not self._gain_config.has_section('usrp_rx_hrpt'):
+			self._gain_config.add_section('usrp_rx_hrpt')
+		self._gain_config.set('usrp_rx_hrpt', 'gain', str(self.gain))
+		self._gain_config.write(open(self.config_filename, 'w'))
+		self._freq_config = ConfigParser.ConfigParser()
+		self._freq_config.read(self.config_filename)
+		if not self._freq_config.has_section('usrp_rx_hrpt'):
+			self._freq_config.add_section('usrp_rx_hrpt')
+		self._freq_config.set('usrp_rx_hrpt', 'freq', str(self.freq))
+		self._freq_config.write(open(self.config_filename, 'w'))
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(self.config_filename)
+		if not self._output_filename_config.has_section('usrp_rx_hrpt'):
+			self._output_filename_config.add_section('usrp_rx_hrpt')
+		self._output_filename_config.set('usrp_rx_hrpt', 'filename', str(self.output_filename))
+		self._output_filename_config.write(open(self.config_filename, 'w'))
+		self._addr_config = ConfigParser.ConfigParser()
+		self._addr_config.read(self.config_filename)
+		if not self._addr_config.has_section('usrp_rx_hrpt'):
+			self._addr_config.add_section('usrp_rx_hrpt')
+		self._addr_config.set('usrp_rx_hrpt', 'addr', str(self.addr))
+		self._addr_config.write(open(self.config_filename, 'w'))
+
+	def get_pll_alpha(self):
+		return self.pll_alpha
+
+	def set_pll_alpha(self, pll_alpha):
+		self.pll_alpha = pll_alpha
+		self._pll_alpha_config = ConfigParser.ConfigParser()
+		self._pll_alpha_config.read(self.config_filename)
+		if not self._pll_alpha_config.has_section('usrp_rx_hrpt'):
+			self._pll_alpha_config.add_section('usrp_rx_hrpt')
+		self._pll_alpha_config.set('usrp_rx_hrpt', 'pll_alpha', str(self.pll_alpha))
+		self._pll_alpha_config.write(open(self.config_filename, 'w'))
+		self.pll.set_alpha(self.pll_alpha)
+		self.pll.set_beta(self.pll_alpha**2/4.0)
+
+	def get_output_filename(self):
+		return self.output_filename
+
+	def set_output_filename(self, output_filename):
+		self.output_filename = output_filename
+		self._output_filename_config = ConfigParser.ConfigParser()
+		self._output_filename_config.read(self.config_filename)
+		if not self._output_filename_config.has_section('usrp_rx_hrpt'):
+			self._output_filename_config.add_section('usrp_rx_hrpt')
+		self._output_filename_config.set('usrp_rx_hrpt', 'filename', str(self.output_filename))
+		self._output_filename_config.write(open(self.config_filename, 'w'))
+
+	def get_max_clock_offset(self):
+		return self.max_clock_offset
+
+	def set_max_clock_offset(self, max_clock_offset):
+		self.max_clock_offset = max_clock_offset
+
+	def get_max_carrier_offset(self):
+		return self.max_carrier_offset
+
+	def set_max_carrier_offset(self, max_carrier_offset):
+		self.max_carrier_offset = max_carrier_offset
+		self.pll.set_max_offset(self.max_carrier_offset)
+
+	def get_hs(self):
+		return self.hs
+
+	def set_hs(self, hs):
+		self.hs = hs
+		self.gr_moving_average_xx_0.set_length_and_scale(self.hs, 1.0/self.hs)
+
+	def get_gain(self):
+		return self.gain
+
+	def set_gain(self, gain):
+		self.gain = gain
+		self._gain_config = ConfigParser.ConfigParser()
+		self._gain_config.read(self.config_filename)
+		if not self._gain_config.has_section('usrp_rx_hrpt'):
+			self._gain_config.add_section('usrp_rx_hrpt')
+		self._gain_config.set('usrp_rx_hrpt', 'gain', str(self.gain))
+		self._gain_config.write(open(self.config_filename, 'w'))
+
+	def get_freq(self):
+		return self.freq
+
+	def set_freq(self, freq):
+		self.freq = freq
+		self._freq_config = ConfigParser.ConfigParser()
+		self._freq_config.read(self.config_filename)
+		if not self._freq_config.has_section('usrp_rx_hrpt'):
+			self._freq_config.add_section('usrp_rx_hrpt')
+		self._freq_config.set('usrp_rx_hrpt', 'freq', str(self.freq))
+		self._freq_config.write(open(self.config_filename, 'w'))
+		self.uhd_usrp_source_0.set_center_freq(self.freq, 0)
+
+	def get_clock_alpha(self):
+		return self.clock_alpha
+
+	def set_clock_alpha(self, clock_alpha):
+		self.clock_alpha = clock_alpha
+		self._clock_alpha_config = ConfigParser.ConfigParser()
+		self._clock_alpha_config.read(self.config_filename)
+		if not self._clock_alpha_config.has_section('usrp_rx_hrpt'):
+			self._clock_alpha_config.add_section('usrp_rx_hrpt')
+		self._clock_alpha_config.set('usrp_rx_hrpt', 'clock_alpha', str(self.clock_alpha))
+		self._clock_alpha_config.write(open(self.config_filename, 'w'))
+		self.digital_clock_recovery_mm_xx_0.set_gain_omega(self.clock_alpha**2/4.0)
+		self.digital_clock_recovery_mm_xx_0.set_gain_mu(self.clock_alpha)
+
+	def get_addr(self):
+		return self.addr
+
+	def set_addr(self, addr):
+		self.addr = addr
+		self._addr_config = ConfigParser.ConfigParser()
+		self._addr_config.read(self.config_filename)
+		if not self._addr_config.has_section('usrp_rx_hrpt'):
+			self._addr_config.add_section('usrp_rx_hrpt')
+		self._addr_config.set('usrp_rx_hrpt', 'addr', str(self.addr))
+		self._addr_config.write(open(self.config_filename, 'w'))
+
+if __name__ == '__main__':
+	parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
+	(options, args) = parser.parse_args()
+	tb = usrp_rx_hrpt_nogui()
+	tb.start()
+	raw_input('Press Enter to quit: ')
+	tb.stop()
+
author	Tom Rondeau <trondeau@vt.edu>	2012-04-02 22:51:55 -0400
committer	Tom Rondeau <trondeau@vt.edu>	2012-04-02 22:51:55 -0400
commit	350726ae56d46d2c7c1adf71b7049369a428d455 (patch)
tree	81749fb01891f6eb7c536ceb95f67a3ef68d9019 /gr-noaa/examples
parent	54b761bfced5574377c1e1a0295fbe3720c104b8 (diff)