Re: [Discuss-gnuradio] Running tunnel.py/benchmark tx.py (OFDM) with XCVR2450?

[Florian Schlembach]

> The XCVR2450 hardware is incapable of full-duplex operation. It *cannot*
> transmit and receive at the same time.

Yes, you are right but consider we are transmitting ping requests just 
for a very short moment (since they are also containing only 84 bytes) 
with a frequency of 1 Hz. Hence, we are occupying the channel only for a 
very short-termed moment.

We have right now in this moment found out or at least got a clue why it 
isn't running.
We have inserted a sleep of roughly 50ms before the 
self.tb.txpath.send_pkt(payload) in order to give the RX/TX switching 
some time. The packet is now sent back and the ping request indicates a 
delay of 56ms (including the sleeping delay of 50ms).

Does anybody has a clue why the RX/TX switching is not established fast 
enough? Is there some code missing what dictates the UHD interface to 
switch? In another application using UHD natively we are not 
experiencing such a strange behavior.