6 files changed, 0 insertions, 619 deletions
diff --git a/gnuradio-examples/python/hier/dect/Makefile.am b/gnuradio-examples/python/hier/dect/Makefile.am
deleted file mode 100644
index 5ab1589aea..0000000000
--- a/gnuradio-examples/python/hier/dect/Makefile.am
+++ /dev/null
@@ -1,28 +0,0 @@
-#
-# Copyright 2007 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.
-# 
-
-EXTRA_DIST = 			\
-	README			\
-	dect_receiver.py	\
-	usrp_source.py		\
-	usrp_dect.py
-
-MOSTLYCLEANFILES = *.pyc *~
diff --git a/gnuradio-examples/python/hier/dect/README b/gnuradio-examples/python/hier/dect/README
deleted file mode 100644
index c8853f185b..0000000000
--- a/gnuradio-examples/python/hier/dect/README
+++ /dev/null
@@ -1,46 +0,0 @@
-This directory contains a work in progress service monitor for DECT
-digital cordless phone base stations and handsets.
-
-
-Status
-------
-
-2007 Apr 27 - Converted to new hier_block2 format
-2007 Apr 03 - Development on hold.
-2007 Feb 11 - Added GMSK demodulation and option to log to file
-2007 Feb 10 - Able to tune and log filtered baseband to file
-
-
-Files
------
-
-usrp_dect.py     - DECT receiver application
-
-dect_receiver.py - Top-level hierarchical block (new type) implementing 
-                   receiver
-
-usrp_source.py   - Hierarchical block (new type) implementing a USRP 
-                   complex source, with convenience functions for tuning, 
-                   gain, decimation, etc.
-
-gmsk2.py         - Hierarchical block (new type) implementing GMSK
-                   modulation and demodulation.  This will eventually go
-                   into the core blksimpl directory
-
-DECT Modulation Details
------------------------
-
-In the US, the FCC has allocated four carrier frequencies for DECT usage:
-
-Channel		Frequency
--------		---------
-   1		1921.536 MHz
-   2		1923.264 MHz
-   3		1924.992 MHz
-   4		1926.720 MHz
-
-These are spaced at 1.728 MHz intervals.
-
-The DECT PHY uses GMSK with a 0.5 bandwidth-time product at 1.152 Msym/sec,
-for an occupied bandwidth (99% power) of 1.186 MHz (1.03 x symbol rate.)
-
diff --git a/gnuradio-examples/python/hier/dect/dect_receiver.py b/gnuradio-examples/python/hier/dect/dect_receiver.py
deleted file mode 100644
index 80ea93794a..0000000000
--- a/gnuradio-examples/python/hier/dect/dect_receiver.py
+++ /dev/null
@@ -1,81 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 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.
-# 
-
-from gnuradio import gr, optfir
-from usrp_source import usrp_source_c
-from gmsk2 import gmsk2_demod
-
-_dect_symbol_rate = 1.152e6
-_dect_occupied_bandwidth = _dect_symbol_rate * 1.03 # BT=0.5
-_dect_channel_bandwidth = 1.728e6
-
-# Top-level hierarchical block that implements DECT demodulation and
-# decoding.
-class dect_receiver(gr.top_block):
-    def __init__(self, options):
-	gr.top_block.__init__(self, "dect_receiver")
-        self._options = options
-
-        # Need greater than 2 samples per symbol. This makes a decimation
-        # rate of 26 and a samples per symbol of 2.136752
-        if_rate = 2.461538e6
-        self._usrp = usrp_source_c(which=0,
-                                   subdev_spec=options.rx_subdev_spec,
-                                   if_rate=if_rate,
-                                   gain=options.gain,
-                                   freq=options.freq,
-                                   calibration=options.calibration,
-                                   verbose=options.verbose)
-
-        # Filter baseband to 1.186 MHz passband, 1.728 MHz stopband
-        chan_taps = optfir.low_pass(1.0,              # Gain
-                                    if_rate,          # Sample rate
-                                    _dect_occupied_bandwidth/2, # One sided modulation bandwidth
-                                    _dect_channel_bandwidth/2,  # One sided channel bandwidth
-                                    1.0,              # Passband ripple (db)
-                                    60)               # Stopband attenuation (db)
-        if self._options.verbose:
-            print "Channel filter has", len(chan_taps), "taps"
-        self._channel_filter = gr.freq_xlating_fir_filter_ccf(1,         # Decimation rate
-                                                              chan_taps, # Filter taps
-                                                              0.0,       # Offset frequency
-                                                              if_rate)   # Sample rate
-
-        self._demod = gmsk2_demod(samples_per_symbol=if_rate/_dect_symbol_rate,
-                                  verbose=options.verbose)
-
-        self._sink = gr.null_sink(gr.sizeof_char)
-        self.connect(self._usrp, self._channel_filter, self._demod, self._sink)
-
-        # Log baseband to file if requested
-        if options.log_baseband is not None:
-            if options.verbose:
-                print "Logging baseband to file", options.log_baseband
-            self.baseband_log = gr.file_sink(gr.sizeof_gr_complex, options.log_baseband)
-            self.connect(self._channel_filter, self.baseband_log)
-
-        # Log demodulator output to file if requested
-        if options.log_demod is not None:
-            if options.verbose:
-                print "Logging demodulator to file", options.log_demod
-            self.demod_log = gr.file_sink(gr.sizeof_char, options.log_demod)
-            self.connect(self._demod, self.demod_log)
diff --git a/gnuradio-examples/python/hier/dect/gmsk2.py b/gnuradio-examples/python/hier/dect/gmsk2.py
deleted file mode 100644
index f26c566552..0000000000
--- a/gnuradio-examples/python/hier/dect/gmsk2.py
+++ /dev/null
@@ -1,278 +0,0 @@
-#
-# GMSK modulation and demodulation.  
-#
-#
-# Copyright 2005,2006,2007 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.
-# 
-
-# See gnuradio-examples/python/digital for examples
-
-from gnuradio import gr
-from gnuradio import modulation_utils
-from math import pi
-import numpy
-from pprint import pprint
-import inspect
-
-# default values (used in __init__ and add_options)
-_def_samples_per_symbol = 2
-_def_bt = 0.35
-_def_verbose = False
-_def_log = False
-
-_def_gain_mu = 0.05
-_def_mu = 0.5
-_def_freq_error = 0.0
-_def_omega_relative_limit = 0.005
-
-
-# /////////////////////////////////////////////////////////////////////////////
-#                              GMSK modulator
-# /////////////////////////////////////////////////////////////////////////////
-
-class gmsk2_mod(gr.hier_block2):
-
-    def __init__(self,
-                 samples_per_symbol=_def_samples_per_symbol,
-                 bt=_def_bt,
-                 verbose=_def_verbose,
-                 log=_def_log):
-        """
-	Hierarchical block for Gaussian Minimum Shift Key (GMSK)
-	modulation.
-
-	The input is a byte stream (unsigned char) and the
-	output is the complex modulated signal at baseband.
-
-	@param samples_per_symbol: samples per baud >= 2
-	@type samples_per_symbol: integer
-	@param bt: Gaussian filter bandwidth * symbol time
-	@type bt: float
-        @param verbose: Print information about modulator?
-        @type verbose: bool
-        @param debug: Print modualtion data to files?
-        @type debug: bool       
-	"""
-        gr.hier_block2.__init__(self,
-                                "gmsk2_mod",                               # Block typename
-                                gr.io_signature(1,1,gr.sizeof_char),       # Input signature
-                                gr.io_signature(1,1,gr.sizeof_gr_complex)) # Output signature
-
-        self._samples_per_symbol = samples_per_symbol
-        self._bt = bt
-
-        if not isinstance(samples_per_symbol, int) or samples_per_symbol < 2:
-            raise TypeError, ("samples_per_symbol must be an integer >= 2, is %r" % (samples_per_symbol,))
-
-	ntaps = 4 * samples_per_symbol			# up to 3 bits in filter at once
-	sensitivity = (pi / 2) / samples_per_symbol	# phase change per bit = pi / 2
-
-	# Turn it into NRZ data.
-	self.nrz = gr.bytes_to_syms()
-
-	# Form Gaussian filter
-        # Generate Gaussian response (Needs to be convolved with window below).
-	self.gaussian_taps = gr.firdes.gaussian(
-		1,		       # gain
-		samples_per_symbol,    # symbol_rate
-		bt,		       # bandwidth * symbol time
-		ntaps	               # number of taps
-		)
-
-	self.sqwave = (1,) * samples_per_symbol       # rectangular window
-	self.taps = numpy.convolve(numpy.array(self.gaussian_taps),numpy.array(self.sqwave))
-	self.gaussian_filter = gr.interp_fir_filter_fff(samples_per_symbol, self.taps)
-
-	# FM modulation
-	self.fmmod = gr.frequency_modulator_fc(sensitivity)
-		
-        if verbose:
-            self._print_verbage()
-         
-        self.connect(self, self.nrz, self.gaussian_filter, self.fmmod, self)
-
-        if log:
-            self._setup_logging()
-
-    def samples_per_symbol(self):
-        return self._samples_per_symbol
-
-    def bits_per_symbol(self=None):     # staticmethod that's also callable on an instance
-        return 1
-    bits_per_symbol = staticmethod(bits_per_symbol)      # make it a static method.
-
-    def _print_verbage(self):
-        print "bits per symbol = %d" % self.bits_per_symbol()
-        print "Gaussian filter bt = %.2f" % self._bt
-
-
-    def _setup_logging(self):
-        print "Modulation logging turned on."
-        self.connect(self.nrz, gr.file_sink(gr.sizeof_float, "nrz.dat"))
-        self.connect(self.gaussian_filter, gr.file_sink(gr.sizeof_float, "gaussian_filter.dat"))
-        self.connect(self.fmmod, gr.file_sink(gr.sizeof_gr_complex, "fmmod.dat"))
-
-    def add_options(parser):
-        """
-        Adds GMSK modulation-specific options to the standard parser
-        """
-        parser.add_option("", "--bt", type="float", default=_def_bt,
-                          help="set bandwidth-time product [default=%default] (GMSK)")
-    add_options=staticmethod(add_options)
-
-    # FIXME: figure out what has to change for gr.hier_block2 version
-    #def extract_kwargs_from_options(options):
-    #    """
-    #    Given command line options, create dictionary suitable for passing to __init__
-    #    """
-    #    return modulation_utils.extract_kwargs_from_options(gmsk_mod.__init__,
-    #                                                        ('self', 'fg'), options)
-    #extract_kwargs_from_options=staticmethod(extract_kwargs_from_options)
-
-
-# /////////////////////////////////////////////////////////////////////////////
-#                            GMSK demodulator
-# /////////////////////////////////////////////////////////////////////////////
-
-class gmsk2_demod(gr.hier_block2):
-
-    def __init__(self,
-                 samples_per_symbol=_def_samples_per_symbol,
-                 gain_mu=_def_gain_mu,
-                 mu=_def_mu,
-                 omega_relative_limit=_def_omega_relative_limit,
-                 freq_error=_def_freq_error,
-                 verbose=_def_verbose,
-                 log=_def_log):
-        """
-	Hierarchical block for Gaussian Minimum Shift Key (GMSK)
-	demodulation.
-
-	The input is the complex modulated signal at baseband.
-	The output is a stream of bits packed 1 bit per byte (the LSB)
-
-	@param samples_per_symbol: samples per baud
-	@type samples_per_symbol: integer
-        @param verbose: Print information about modulator?
-        @type verbose: bool
-        @param log: Print modualtion data to files?
-        @type log: bool 
-
-        Clock recovery parameters.  These all have reasonble defaults.
-        
-        @param gain_mu: controls rate of mu adjustment
-        @type gain_mu: float
-        @param mu: fractional delay [0.0, 1.0]
-        @type mu: float
-        @param omega_relative_limit: sets max variation in omega
-        @type omega_relative_limit: float, typically 0.000200 (200 ppm)
-        @param freq_error: bit rate error as a fraction
-        @param float
-	"""
-
-        gr.hier_block2.__init__(self,
-                                "gmsk2_demod",                             # Block typename
-                                gr.io_signature(1,1,gr.sizeof_gr_complex), # Input signature
-                                gr.io_signature(1,1,gr.sizeof_char))       # Output signature
-                                
-        self._samples_per_symbol = samples_per_symbol
-        self._gain_mu = gain_mu
-        self._mu = mu
-        self._omega_relative_limit = omega_relative_limit
-        self._freq_error = freq_error
-        
-        if samples_per_symbol < 2:
-            raise TypeError, "samples_per_symbol >= 2, is %f" % samples_per_symbol
-
-        self._omega = samples_per_symbol*(1+self._freq_error)
-
-	self._gain_omega = .25 * self._gain_mu * self._gain_mu        # critically damped
-
-	# Demodulate FM
-	sensitivity = (pi / 2) / samples_per_symbol
-	self.fmdemod = gr.quadrature_demod_cf(1.0 / sensitivity)
-
-	# the clock recovery block tracks the symbol clock and resamples as needed.
-	# the output of the block is a stream of soft symbols (float)
-	self.clock_recovery = gr.clock_recovery_mm_ff(self._omega, self._gain_omega,
-                                                      self._mu, self._gain_mu,
-                                                      self._omega_relative_limit)
-
-        # slice the floats at 0, outputting 1 bit (the LSB of the output byte) per sample
-        self.slicer = gr.binary_slicer_fb()
-
-        if verbose:
-            self._print_verbage()
-
-        self.connect(self, self.fmdemod, self.clock_recovery, self.slicer, self)
-
-        if log:
-            self._setup_logging()
-
-    def samples_per_symbol(self):
-        return self._samples_per_symbol
-
-    def bits_per_symbol(self=None):   # staticmethod that's also callable on an instance
-        return 1
-    bits_per_symbol = staticmethod(bits_per_symbol)      # make it a static method.
-
-    def _print_verbage(self):
-        print "bits per symbol = %d" % self.bits_per_symbol()
-        print "M&M clock recovery omega = %f" % self._omega
-        print "M&M clock recovery gain mu = %f" % self._gain_mu
-        print "M&M clock recovery mu = %f" % self._mu
-        print "M&M clock recovery omega rel. limit = %f" % self._omega_relative_limit
-        print "frequency error = %f" % self._freq_error
-
-
-    def _setup_logging(self):
-        print "Demodulation logging turned on."
-        self.connect(fmdemod, gr.file_sink(gr.sizeof_float, "fmdemod.dat"))
-        self.connect(clock_recovery, gr.file_sink(gr.sizeof_float, "clock_recovery.dat"))
-        self.connect(slicer, gr.file_sink(gr.sizeof_char, "slicer.dat"))
-
-    def add_options(parser):
-        """
-        Adds GMSK demodulation-specific options to the standard parser
-        """
-        parser.add_option("", "--gain-mu", type="float", default=_def_gain_mu,
-                          help="M&M clock recovery gain mu [default=%default] (GMSK/PSK)")
-        parser.add_option("", "--mu", type="float", default=_def_mu,
-                          help="M&M clock recovery mu [default=%default] (GMSK/PSK)")
-        parser.add_option("", "--omega-relative-limit", type="float", default=_def_omega_relative_limit,
-                          help="M&M clock recovery omega relative limit [default=%default] (GMSK/PSK)")
-        parser.add_option("", "--freq-error", type="float", default=_def_freq_error,
-                          help="M&M clock recovery frequency error [default=%default] (GMSK)")
-    add_options=staticmethod(add_options)
-
-    # FIXME: figure out what this is for gr.hier_block2 version
-    #def extract_kwargs_from_options(options):
-    #    """
-    #    Given command line options, create dictionary suitable for passing to __init__
-    #    """
-    #    return modulation_utils.extract_kwargs_from_options(gmsk_demod.__init__,
-    #                                                        ('self', 'fg'), options)
-    #extract_kwargs_from_options=staticmethod(extract_kwargs_from_options)
-
-#
-# Add these to the mod/demod registry
-#
-modulation_utils.add_type_1_mod('gmsk2', gmsk2_mod)
-modulation_utils.add_type_1_demod('gmsk2', gmsk2_demod)
diff --git a/gnuradio-examples/python/hier/dect/usrp_dect.py b/gnuradio-examples/python/hier/dect/usrp_dect.py
deleted file mode 100755
index 27259d8127..0000000000
--- a/gnuradio-examples/python/hier/dect/usrp_dect.py
+++ /dev/null
@@ -1,62 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 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.
-# 
-
-from gnuradio import gr, eng_notation
-from gnuradio.eng_option import eng_option
-from optparse import OptionParser
-from dect_receiver import dect_receiver
-import sys
-
-def main():
-	parser = OptionParser(option_class=eng_option)
-        parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
-                          help="select USRP Rx side A or B (default=first one with a daughterboard)")
-        parser.add_option("-f", "--freq", type="eng_float", default=None,
-                          help="set frequency to FREQ", metavar="FREQ")
-        parser.add_option("", "--calibration", type="eng_float", default=0.0,
-                          help="set frequency calibration offset to FREQ")
-        parser.add_option("-g", "--gain", type="eng_float", default=None,
-                          help="set gain in dB (default is midpoint)")
-	parser.add_option("-v", "--verbose", action="store_true", default=False,
-			  help="print extra debugging info")
-        parser.add_option("", "--log-baseband", default=None,
-                          help="log filtered baseband to file")
-        parser.add_option("", "--log-demod", default=None,
-                          help="log demodulator output to file")
-        (options, args) = parser.parse_args()
-
-	if len(sys.argv) == 1 or len(args) != 0:
-            parser.print_help()
-            sys.exit(1)
-	
-	# Create an instance of a hierarchical block
-	top_block = dect_receiver(options)
-			      
-	try:    
-            # Run forever
-            top_block.run()
-	except KeyboardInterrupt:
-            # Ctrl-C exits
-            pass
-
-if __name__ == '__main__':
-    main ()
diff --git a/gnuradio-examples/python/hier/dect/usrp_source.py b/gnuradio-examples/python/hier/dect/usrp_source.py
deleted file mode 100644
index 6a779840f2..0000000000
--- a/gnuradio-examples/python/hier/dect/usrp_source.py
+++ /dev/null
@@ -1,124 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 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.
-# 
-
-from gnuradio import gr, usrp, eng_notation
-n2s = eng_notation.num_to_str
-
-# Hierarchical block implementing a USRP source for complex floats,
-# with convenience functions for gain, tune, decimation, etc.
-#
-class usrp_source_c(gr.hier_block2):
-    """
-    Create a USRP source object supplying complex floats.
-    """
-    def __init__(self, which=0, subdev_spec=None, gain=None, if_rate=None,
-                 freq=0.0, calibration=0.0, verbose=False):
-	# Call hierarchical block constructor
-	gr.hier_block2.__init__(self,
-                                "usrp_source_c",                           # Block typename
-				gr.io_signature(0,0,0),                    # Input signature
-				gr.io_signature(1,1,gr.sizeof_gr_complex)) # Output signature
-
-        self._verbose = verbose
-        self._u = usrp.source_c(which)
-        if self._verbose:
-            print 'ADC sample rate is', n2s(self._u.adc_rate()), "sps"
-        self.set_subdev(subdev_spec)
-        self.set_if_rate(if_rate)
-        self.set_gain(gain)
-        self.set_calibration(calibration)
-        self.tune(freq)
-        self.connect(self._u, self)
-
-    def set_subdev(self, subdev_spec):
-        if subdev_spec is None:
-            subdev_spec = self.pick_subdevice()
-        self._subdev = usrp.selected_subdev(self._u, subdev_spec)
-        self._u.set_mux(usrp.determine_rx_mux_value(self._u, subdev_spec))
-        if self._verbose:
-            print 'RX using', self._subdev.name(), 'daughterboard'
-            
-    def pick_subdevice(self):
-        """
-        The user didn't specify a subdevice.
-        If there's a daughterboard on A, select A.
-        If there's a daughterboard on B, select B.
-        Otherwise, select A.
-        """
-        if self._u.db[0][0].dbid() >= 0:       # dbid is < 0 if there's no d'board or a problem
-            return (0, 0)
-        if self._u.db[1][0].dbid() >= 0:
-            return (1, 0)
-        return (0, 0)
-
-    def set_if_rate(self, if_rate):
-        # If no IF rate specified, set to maximum decimation
-        if if_rate is None:
-            self._decim = 256
-        else:
-            self._decim = int(self._u.adc_rate()/if_rate)
-
-        self._u.set_decim_rate(self._decim)
-        self._if_rate = self._u.adc_rate()/self._decim
-
-        if self._verbose:
-            print "USRP decimation rate is", self._decim
-            print "USRP IF rate is", n2s(self._if_rate), "sps"
-            
-    def set_gain(self, gain):
-	# If no gain specified, set to midrange
-	if gain is None:
-	    g = self._subdev.gain_range()
-	    gain = (g[0]+g[1])/2.0
-        self._gain = gain
-        self._subdev.set_gain(self._gain)
-
-    def set_calibration(self, calibration):
-        self._cal = calibration
-        if self._verbose:
-            print "Using frequency calibration offset of", n2s(calibration), "Hz"
-            
-    def tune(self, freq):
-        """
-        Set the center frequency we're interested in.
-
-        @param target_freq: frequency in Hz
-        @type: bool
-
-        Tuning is a two step process.  First we ask the front-end to
-        tune as close to the desired frequency as it can.  Then we use
-        the result of that operation and our target_frequency to
-        determine the value for the digital down converter.
-        """
-        self._tune_result = usrp.tune(self._u, 0, self._subdev, freq+self._cal)
-        if self._tune_result:
-            if self._verbose:
-                print "Baseband frequency is", n2s(self._tune_result.baseband_freq), "Hz"
-                print "DXC frequency is", n2s(self._tune_result.dxc_freq), "Hz"
-                print "Center frequency is", n2s(freq), "Hz"
-                print "Residual frequency is", n2s(self._tune_result.residual_freq), "Hz"
-            return True
-        
-        return False
-
-if __name__ == '__main__':
-    src = usrp_source_c(verbose=True)