[USRP-RIO] IQ imbalance in stock streaming example

[Nicola_TUD]

Hi,

we are using the following setup:

• A USRP-RIO is connected via PCI card to a desktop PC
• An external signal generator is used to produce a test signal
• The test signal is split 3-way and distributed to USRP Ch0, USRP Ch1 as well as a spectrum analyzer

The USRP receiver clearly shows some severe IQ imbalance, while the spectrum analyzer produces the expected result.

Is this the expected receiver characteristics of the USRP-RIO?

Is there a way to calibrate the device or do we need to estimate and compensate the imbalance manually?

Nicola