[USRP-users] Signal transmission on a USRP X310

Marcus D. Leech patchvonbraun at gmail.com
Wed Jul 22 14:24:05 EDT 2020


On 07/22/2020 02:15 PM, Jerrid Plymale via USRP-users wrote:
>
> Hello Marcus,
>
> The tool I have been using for initial signal quality checking has 
> been the QT Waterfall sink in GNU Radio Companion to see if the 
> signals are looking correct. Upon seeing that it looked like I was 
> loosing data when I set the USRP sink’s center frequency above 1.3 
> GHz, I connected the output of the USRP to a spectrum analyzer to get 
> some more accurate measurements of the signal. After running some 
> tests, I found that at a center frequency less than 1.3 GHz, the 
> strength of the signal was somewhere around -70 dBm. When I would 
> increase the frequency to a value above 1.3 GHz, and no changes to 
> anything else (e.g., channel gain, sample rate), the strength dropped 
> to somewhere around -90 dBm. This was measured by tracking the peak 
> power from an FFT of the signal input to the spectrum analyzer. Would 
> it help to see the flowgraph?
>
> Best Regards,
>
> Jerrid Plymale
>
>
>
Yes, it would help to see the flow-graph, and to see what settings 
you're using in the TX path.  The output power from the UBX is not 
likely to be
   completely consistent across the entire tuneable range, but 20dB is 
way more than I would expect.



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