Re: [Discuss-gnuradio] USRP N200, RFX 1800 not receiving signal

[Marcus D. Leech]

On 24/08/2011 9:41 AM, Urs Hunkeler wrote:
> Hi,
>
> My USRP N200 / RFX 1800 combination seems to not receive any useful 
> signal. The software seems to work, there are no error messages, and 
> the USRP seems to sample noise but does not even show a signal from a 
> signal generator.
>
> Has anybody an idea what I might be doing wrong, or what else I could 
> try?
>
> I use Ubuntu and installed/compiled the latest GNUradio / UHD 
> software. I used the uhd_fft.py script to test the radio. I tried 
> different frequencies, both antennas and different transmit power 
> level on the signal generator (-110dBm - -10dBm). The only thing I see 
> is noise, which changes slightly when I change the gain.
>
> The command to start uhd_fft.py was:
>
> uhd_fft.py -A RX2 -f 2G --samp-rate=16M
Since 16M isn't a "proper" sample rate for a N200, perhaps that's the 
problem.

Try 1.0M, 2.0M, 2.5M, 5.0M, 10M

If it's just a narrowband signal, you don't need very much host-side 
bandwidth.