Hi Josh, On Jul 16, 2010, at 9:09 PM, Josh Blum wrote:
> This is a bug in the wbx reference divider code. It will be fixed soon. What > frequency were you requesting? I was entering 1e6 (1000000 Hz), which was an incorrect value I guess, since the WBX cannot receive 1 MHz, which resulted in the following error: terminate called after throwing an instance of 'std::invalid_argument' what(): key not found in dict I tried with 2e9 (2GHz), and since that was within a valid input range, now it gives me the following error: >>> gr_fir_fff: using SSE Current recv sock buff size: 50000000 bytes Current send sock buff size: 50000000 bytes Using: WBX TX (0x0053) Using: WBX RX (0x0052) RX samples per packet: 362 TX samples per packet: 363 Recv pirate num frames: 33967 gr_block_executor: source <gr_block uhd simple source (7)> produced no output. We're marking it DONE. I have attached the GRC file :
usrp2_wfm_rcv.grc
Description: Binary data
Do you have a working GRC example of WFM demodulation? I'm having difficultly
trying to covert the existing python script to GRC, since the libraries are
unfamiliar to me at the moment.
e.g. I don't know which GRC blocks correspond to the following code fragments:
# channel filter co-efficients
chan_filt_coeffs = optfir.low_pass (1, # gain
usrp_rate, # sampling rate
80e3, # passband cutoff
115e3, # stopband cutoff
0.1, # passband ripple
60) # stopband attenuation
chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
Best regards,
Elvis Dowson
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