Dc offset is different from unit to unit

GNU Radio
1

Hi list,
I need to compensate usrp dc offset. but the dc offset is different
from unit to unit. so do I need to calibrate each unit dc offset or
there is a universal value that work
for each unit?

Regards

2

James,

In the case of DC calibration for tx, we’d recommend running the dc
calibration routines provided with UHD for each unit. The cal routines
make it a relatively easy process.

In theory, if the average DC offset is non-zero you may be able to apply
an average correction and see some improvement - but less than a
per-unit calibration. I don’t have have any data on hand for an average
DC offset.

I’m cross-posting to the usrp-users list, which is more oriented to USRP
specific questions.

Best Regards
John M.

3

Hi John,
Thanks. But how to deal with rx dc offset?