phase difference between Tx/Rx1 Tx/Rx2

Hi,

    I have a USRP x310 and 2 UBX daughterboard. I'd like to send a signal using RFA TX/RX port, and receive the signal from RFA RX2 and RFB RX2 port. I am interested to get the phase difference between the RFA TX/RX and RFA RX2,  RFA TX/RX  and RFB RX2, how to do that? Is any grc block that I can use?

Thanks,

Xiang Ma

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Xiang Ma, Ph.D. Student

College of Engineering

Utah State University

E-mail:marxwolfs@gmail.com