Thanks Martin for your reply. I gave a larger gain, but still doesn't work.
And I think I was using AM modulation in my tx_path, wasn't it? And I used
usrp_am_mw_rcv.py to receive my transmitted signal. Should I use
gr.interp_fir_filter_fff() on the transmitter side for am modulation? Are
the parameters correct in optfir.low_pass()?
interp_factor = usrp_rate/audio_rate
interp_taps = optfir.low_pass (interp_factor, # gain
usrp_rate, # sampling rate
8e3, # passband cutoff
8e3
12e3, # stopband cutoff
12e3
1.0, # passband ripple
60) # stopband
attenuation
print 'len(interp_taps)',len(interp_taps)
self.interpolator = gr.interp_fir_filter_fff (interp_factor,
interp_taps)
Thanks in advance for any reply.
Brook
Martin Braun-3 wrote:
>
> I can't spot an exact problem, but two things do come to mind:
> 1) Your gain is awfully low, you're hardly using the dynamic range of
> the ADC. Try something like 20000.
> 2) Use an analog modulation, such as AM (w/ carrier) or FM.
>
> MB
> --
> Dipl.-Ing. Martin Braun Phone: +49-(0)721-608 3790
> Institut fuer Nachrichtentechnik Fax: +49-(0)721-608 6071
> Universitaet Karlsruhe (TH) http://www.int.uni-karlsruhe.de/
>
>
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