On Dec 29, 2007, at 4:03 PM, Matt Ettus wrote:
Your message stated you wanted to do "simultaneous TX/RX". If you
want to switch back and forth, then you do not want simultaneous,
which is a good thing. You want to use the auto t/r switching mode.
Just to clarify, and IIRC so please correct:
The "auto_tr()" mode works as follows: If -nothing- is on the TX
stream on the USRP hardware (e.g. data is stalled, by whatever
means), then RX will happen. If -anything- is going across USRP TX
hardware (e.g. all 0's, your desired signal, whatever), then TX will
happen.
The best way to make use of "auto_tr()" is via packets, not
streams ... thus my comment about not yet trying out a "gr_stall"
block for streaming, since I haven't really tried "packets" yet.
Given my PPT example, it makes more sense to use half-duplex on 1
antenna (not auto_tr), or full-duplex on 2 antennas (not auto_tr),
rather than try to packetize the data stream to make use of auto_tr.
Thus, if your application can be easily packetized, then the use of
"auto_tr" is warranted. Otherwise, either use different antennas or
manually switch the USRP_TX object on and off.
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