On 13/11/2023 16:48, Steve Hamn wrote:
Thanks for the response. Reading that page about the tune_request_t it
says "/The daughterboards that support this functionality are: WBX
(all revisions), WBX-120, SBX (all revisions), SBX-120, CBX, CBX-120,
UBX, UBX-160/" so will that work for the N320? I actually am trying to
avoid the DC signal and have manually tuned 2MHz above the LO
(fc=220MHz, BW=2MHz-4MHz) but still see this behavior.
The N320 uses an architecture that pretty-much *requires* that
offset-tuning work, in my previous response, I had mis-read
your message--sorry.
Your strategy would be to offset-tune so that the DC anomaly is just
outside your passband, as defined by your sample rate.
Another thing is that when debugging issues like this, it can be VERY
VERY useful to perform some kind of spectral analysis
on the data. You may well have an interfering signal that is
dominating your samples, and without doing an FFT, you'd
never know.
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