TwinRX self-calibration

[robert2025]

Hi All, 

I have a X310 with two (2) TwinRX daughterboards so I need to calibrate the daughterboards for IQ imbalance.

I tried to apply the calibration utilities from UHD manual, https://files.ettus.com/manual/page_calibration.html.

Using the function "uhd_cal_rx_iq_balance" with different arguments but I got the same common error: 

“Could not find radio on mboard 0 that matches subdev A:0”

But I tried three (3) different versions, please see the 3 lines below

1. uhd_cal_rx_iq_balance --args="type=x300,addr=”192.168.40.2”,subdev=TwinRX" --subdev=”A:0”
2. uhd_cal_rx_iq_balance --args="type=x300,addr=”192.168.40.2”,subdev=TwinRX" --subdev=”RX1”
3. uhd_cal_rx_iq_balance --args="type=x300,addr=”192.168.40.2”,subdev=TwinRX" --subdev=”A:0 A1 B:0 B1”

My understanding is that utility function would provide a complex value that represents the IQ imbalance compensation.

Could you please provide any help regarding the correct arguments?

Many thanks for any help.

Roberto B.

[robert2025]

The problem was that I need to run these utilities commands as root.