[Discuss-gnuradio] Passband anomaly with dual-channel LimeSDR

First, a pic of two FFTs from the two channels of LimeSDR, tuned exactly
the same.

http://www.ccera.ca/files/dual_channel_limesdr.png

Then the flow-graph that produced it:

http://www.ccera.ca/files/untitled.grc


The differences are somewhat subtle--one channel has a 5dB roll-off,
while the other doesn't. This may just be subtle analog differences in
the noise
spectrum. But it might be useful to check that filters are being set
properly in the two-channel scenario.

Also, the DC offset is quite large, but this may not be a "fair" test,
since the inputs are just "dangling" with no external signal at all.



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