How to isolate the signals between TX/RX and RX2 on the USRP N210?

Hello everyone,
    I want to use one USRP N210 to transmit and receive signals simultaneously. But when I try to transmit signals from TX/RX and receive signals from RX2(the transmitted and received signals are on the same center frequency), I found that the there are signals leaked from TX/RX to RX2.  What can I do if I want to isolate the signals between TX/RX and RX2?
   Thanks very much!

Hello -
I believe two questions are being asked on this thread:
1. Isolation:  The internal switch provides about 30dB of isolation between TX/RX and RX2. As with most transcievers, if you transmit and recieve on the same frequency at the same time you will recieve your own transmission as well.
2. Spurs: The USRP represents and optimized price vs performance and some images and spurs will occur.  Often they can be predicted as you mention. One thing you can do is use the CORDIC to acquire a signal at IF and then digitally shift I and Q to the ceneter frequency and bandwidth of interest.   This is done by setting the 'lo' via a property node and 'center frequency' to different values.
Other NI RF instrumentation options are available if you're looking for  RF performance.  The NI 5791 was recenty released and may be of interest.
Best Regards,
Erik

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