On 26/03/2025 12:09, Rob Kossler wrote:
Hi Marcus,
I think that the gain is set from the "radio" block which operates at
the master clock rate rather than the downconverted rate. It doesn't
make sense to me why the latency of the gain setting would be related
to the downconverted sample rate.
Rob
Let us ignore for a moment the gain-setting hardware on the radio. Let's
pretend that some noticeable signal parameter,
as seen at the antenna plane, changes suddenly--like the signal level
comes up by 5dB. How long before that effect is
actually seen in the sample stream? That will depend on the (very
small) group delay in the analog hardware, and the delay
in the DDC filters, which DOES scale with sample-rate, because
different filters are switched-in depending on the commanded
sample rate, and those filters have non-zero length...
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