On 2022-03-17 04:49, [email protected] wrote:
Hello,
I'm using usrp e312 for acquisitions on modulated signals and i have
undesired power variations in time domain (2 to 10%). Thanks to analog
devices tools, i discovered that disabling bb_dc_offset tracking on
AD9361 settled the problem. As far as I know, uhd only provides
"rf_dc_offset" and "iq_imbalance" control and this doesn't settle the
problem. My question is how, on an uspr e312, can I disable
bb_dc_offset tracking ? (Or at least modify bb_dc_offset loop parameters).
Thanks for any help,
Armand
Have you tried using offset tuning? This may or may not make a
difference in your case. But it's worth a try.
https://files.ettus.com/manual/page_general.html#general_tuning_process
If you use a tune_request structure, you can specify both the desired
"air" frequency and the offset, and UHD will automatically take care of
offsetting everything,
but still delivering the desired frequency within your baseband. You
will need to set the analog bandwidth wide enough to account for the offset.
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