Re: [Discuss-gnuradio] BasicRX boards and AM transmission

[Don Ward]

"Philip Heron" <address@hidden> wrote:

> Martin Braun wrote:
> > RXing with the USRP simply doesn't work, though, neither with 
> > usrp_rx_nogui.py nor with anything I could come up with. I get lots more 
> > noise than expected and usually I get a very loud buzz or whistle which 
> > is a lot louder than the TXed signal. Has anyone else had this problem?
>
> Hi Martin,
>
> Just a quick "me too!". I don't have a USRP yet but I did try using GNU 
> Radio to receive AM radio signals with a BT878 chip. With a slightly 
> modified am_rcv.py I could hear the station, but it was very weak and 
> drowned out by lots of noise. The capture was fine as I was able to get 
> good audio (as good as AM can be anyway) with the Dream DRM receiver in 
> analogue mode, using GNU Radio to shift the target carrier down to 12kHz.
>
> -Phil

I don't think it is the USRP and I don't think it is anything inherent in 
GNU Radio.  I have been using the USRP (with LFRX) and GNU Radio for 
HF/MF/LF reception for a while now with great success.  My recollection is 
that am_rcv.py had some problems (e.g., specifying the if_rate in the design 
of the audio filter); I have not looked at usrp_rx_nogui.py.

Unless your hardware is broken, I'll bet you can find a remedy in the 
software.

-- Don W.