From 5bfda44b8d4093c81779c05c98f3bbd310f198df Mon Sep 17 00:00:00 2001
From: n4hy <n4hy@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Wed, 1 Oct 2008 20:42:43 +0000
Subject: pll bandwidth optimized to more nearly meet Carson's rule. The 19
kHz pilot recovery will soon be replace by polyphase channelizer trick
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9694 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
(limited to 'gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py')
diff --git a/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py b/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py
index 80f2b84660..84992955a2 100755
--- a/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py
+++ b/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py
@@ -81,13 +81,13 @@ class wfm_rx_block (stdgui2.std_top_block):
self.u = usrp.source_c() # usrp is data source
adc_rate = self.u.adc_rate() # 64 MS/s
- usrp_decim = 160
+ usrp_decim = 200
self.u.set_decim_rate(usrp_decim)
- usrp_rate = adc_rate / usrp_decim # 400 kS/s
+ usrp_rate = adc_rate / usrp_decim # 320 kS/s
chanfilt_decim = 1
demod_rate = usrp_rate / chanfilt_decim
audio_decimation = 10
- audio_rate = 6*demod_rate / audio_decimation/5 # 48 kHz
+ audio_rate = 3*demod_rate / audio_decimation/2 # 48 kHz
if options.rx_subdev_spec is None:
options.rx_subdev_spec = pick_subdevice(self.u)
@@ -100,12 +100,13 @@ class wfm_rx_block (stdgui2.std_top_block):
usrp_rate, # sampling rate
90e3, # passband cutoff
30e3, # transition bandwidth
- 60) # stopband attenuation
-# print len(chan_filt_coeffs)
+ 70, # stopband attenuation
+ gr.firdes.WIN_BLACKMAN)
+ print len(chan_filt_coeffs)
chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
- self.rchan_sample = blks2.rational_resampler_fff(6,5)
- self.lchan_sample = blks2.rational_resampler_fff(6,5)
+ self.rchan_sample = blks2.rational_resampler_fff(3,2)
+ self.lchan_sample = blks2.rational_resampler_fff(3,2)
#self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
--
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