On Wed, Mar 26, 2025 at 12:32 PM Marcus D. Leech <patchvonbr...@gmail.com> wrote:
> 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... > > True. But if the comparison is between the gain setting time stamp and the Rx samples time stamp (inserted at the radio) it still seems that it would be sample rate independent (with the caveat that the time stamp resolution may have to change to the decimated sample rate with some type of quantization)
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