The frequency tag is inserted at some point shortly after the
command-set is issued to the hardware. There's no way for the various
bits and pieces to tell when the underlying (mostly analog) hardware has
converged to an "acceptable" steady-state operating mode. PLL
synthesizers don't instantly switch from one frequency to another,
digital (and analog) filters have group delays, etc.
The time to achieve steady-state can vary from hardware-type to
hardware-type, ambient temperature, size of the frequency step, etc.
On 2017-07-14 15:10, Eugene Grayver via USRP-users wrote:
> I am running some experiments to understand the timing of TwinRX tuning. A
> very simple experiment shows that the tag indicating a frequency change is
> not placed at the right sample. Here's a capture: The dashed line indicates
> the tag sample number. However, there's clearly something happening before
> the tag. Note that I am not using timed commands for this - just a regular
> tune request.
>
> _______________________
> Eugene Grayver, Ph.D.
> Aerospace Corp., Sr. Eng. Spec.
> Tel: 310.336.1274
> ________________________
>
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