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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