UHD Calibration

GNU Radio
1

I would like to say that I just received a new N210 and am very happy
with
the quality and performance of the device. I have started to
familiarize
myself with the included utilities and have run the uhd_cal_* routines.

My question is does repeated runs of the calibration increase the
performance? For example, does running the sequence
uhd_cal_tx_iq_ballance,
uhd_cal_tx_dc_offset, uhd_cal_tx_iq_ballance, uhd_cal_tx_dc_offset
produce
better calibration than just the sequence uhd_cal_tx_iq_ballance,
uhd_cal_tx_dc_offset?

Evan M.

2

On 12/13/2011 09:17 AM, Evan M. wrote:

I would like to say that I just received a new N210 and am very happy with
the quality and performance of the device. I have started to familiarize
myself with the included utilities and have run the uhd_cal_* routines.

Thanks!

My question is does repeated runs of the calibration increase the
performance? For example, does running the sequence uhd_cal_tx_iq_ballance,
uhd_cal_tx_dc_offset, uhd_cal_tx_iq_ballance, uhd_cal_tx_dc_offset produce
better calibration than just the sequence uhd_cal_tx_iq_ballance,
uhd_cal_tx_dc_offset?

I guess the idea is that the transmit calibration is somehow more
accurate after receive has been calibrated. Thats possible, but I
haven’t observed it in practice. If I had to make a recommendation, I
would say to run the RX IQ cal first.

-Josh

3

Evan M. wrote in post #1036544:

I would like to say that I just received a new N210 and am very happy
with
the quality and performance of the device. I have started to
familiarize
myself with the included utilities and have run the uhd_cal_* routines.

My question is does repeated runs of the calibration increase the
performance? For example, does running the sequence
uhd_cal_tx_iq_ballance,
uhd_cal_tx_dc_offset, uhd_cal_tx_iq_ballance, uhd_cal_tx_dc_offset
produce
better calibration than just the sequence uhd_cal_tx_iq_ballance,
uhd_cal_tx_dc_offset?

Evan M.

Another questions… should I terminate the inputs/outputs (i.e. 50ohm)?

-Mark