On 26/03/2025 06:13, je.amg...@gmail.com wrote:
I'm using timed commands to set the RX gain at a precise moment with
the following command:
set_command_time(md.time_spec + uhd::time_spec_t(0.02), 0);
However, I noticed that there is a delay between the specified time
and the actual time when the gain is applied. This delay is
significantly larger than the component latency responsible for
changing the gain and appears to depend on the sampling frequency.
Specifically, the delay is approximately 20 samples.
I’m trying to understand why this delay is much greater than the
expected component latency and why it scales with the sampling
frequency. Any insights on this behavior?
Regards.
Jamaleddine
A change in signals presented to the head of the DDC chain will take
some number of sample times to propagate through the
finite-length filters in the DDC. They don't (and, indeed, cannot)
have zero group delay.
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