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Next to the performance of the first LO and the first mixer, the performance of the various resolution filters does have a huge impact on the performance of a spectrum analyzer. To provide some understanding of what the tinySA resolution filters can (not) do I added a page to the wiki:

I just learned of the tinySA a few minutes ago via another list. I'd like to get more details on the filter implementation. I'm a retired seismic research scientist/programmer with almost 40 years of DSP experience. So I think I can probably help. I know a lot of ways to do DSP operations.

Have Fun!
Reg

On Thu, Jul 23, 2020 at 10:38 PM, Reginald Beardsley wrote:

I'd like to get more details on the filter implementation.

The resolution filters are fixed inside an IC and can not be changed