Zeroing out packets at RX2 if transmitted by own RFX900's TX/RX

GNU Radio
1

Hi

My goal is that when the USRP N200 R4 is transmitting packets, the
receive
antenna on it’s own daughterboard should not receive the transmitted
packets.

For this, I am trying to zero out the samples of packets(GMSK) received
by
the RX2 antenna (on RFX900 daughterboard ) precisely for the duration of
time when the TX/RX antenna is transmitting packets, by modifying the
FPGA
image.

There are certain subtle points I need to take care of:

  1. My understanding is that ‘tx_run’ will give a ‘1’ for the time
    duration
    between ‘sob’ and ‘eob’ as encountered by the FPGA.
    Am I right or wrong ?

  2. If I try to zero out the incoming received samples at RX2 during this
    duration(when tx_run=1), it will not solve the purpose because the time
    by
    when the packet/signal is actually transmitted in air by the TX/RX
    antenna,
    by that time the zeroing out at RX2 would have stopped (as tx_run is no
    longer ‘1’).
    Am I right or wrong ?

What would be the best way to do this?
Any suggestions would be appreciated.

Amy