Hi,
I modified the usrp_decimation to 210, which gives me an ouput of 476190
Hz for the audio sample output. This was the closest I could get it to work at
48KHz.
I still get broken FM audio output, and I constantly get the audio buffer
under-run aUaU messages on the console.
Could someone please help me get the correct FM receiver output settings?
I'm using the following command line parameters to start the program:
./usrp2_wfm_rcv.py -e eth2 -f 104.4 -V 0.0 -g 31 -O hw:0,0
Here is a patch of the modifications that I've made to the script so far:
diff --git a/gnuradio-examples/python/usrp2/usrp2_wfm_rcv.py
b/gnuradio-examples/python/usrp2/usrp2_wfm_rcv.py
index 1783660..84b7ef9 100755
--- a/gnuradio-examples/python/usrp2/usrp2_wfm_rcv.py
+++ b/gnuradio-examples/python/usrp2/usrp2_wfm_rcv.py
@@ -69,11 +69,12 @@ class wfm_rx_block (stdgui2.std_top_block):
self.u = usrp2.source_32fc(options.interface, options.mac_addr)
adc_rate = self.u.adc_rate() # 100 MS/s
- usrp_decim = 312
+ usrp_decim = 210
self.u.set_decim(usrp_decim)
usrp_rate = adc_rate / usrp_decim # ~320 kS/s
chanfilt_decim = 1
demod_rate = usrp_rate / chanfilt_decim
+ print "demod_rate = %d" % (demod_rate)
audio_decimation = 10
audio_rate = demod_rate / audio_decimation # ~32 kHz
@@ -87,7 +88,8 @@ class wfm_rx_block (stdgui2.std_top_block):
dbid == 0x0040 or #usrp_dbid.TV_RX_REV_3
dbid == 0x0043 or #usrp_dbid.TV_RX_MIMO
dbid == 0x0044 or #usrp_dbid.TV_RX_REV_2_MIMO
- dbid == 0x0045 ): #usrp_dbid.TV_RX_REV_3_MIMO
+ dbid == 0x0045 or #usrp_dbid.TV_RX_REV_3_MIMO
+ dbid == 0x0053 ): #usrp_dbid.WBX
print "This daughterboard does not cover the required frequency
range"
print "for this application. Please use a BasicRX or TVRX
daughterboard."
raw_input("Press ENTER to continue anyway, or Ctrl-C to exit.")
Elvis Dowson
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