Forum: GNU Radio Zeroing out packets at RX2 if transmitted by own RFX900's TX/RX

63ea46c80a349494f5acff0edfed1b44?d=identicon&s=25 Amy Kumar (Guest)
on 2013-08-10 23:13
(Received via mailing list)
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
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