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Re: [Discuss-gnuradio] uhd running parallel tx/rx flowgraphs

From: Andre Puschmann
Subject: Re: [Discuss-gnuradio] uhd running parallel tx/rx flowgraphs
Date: Sun, 26 Feb 2012 13:13:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2

On 02/26/2012 10:38 AM, Apurv Bhartia wrote:
> Hi,
> I'm running Ubuntu 11.10 + UHD 003.004.000 + USRP2.
> I'm trying to run a transceiver script for OFDM, which has both the tx
> and rx flowgraphs (very similar to tunnel.py except the TUN interface).
> But, I can't seem to receive anything successfully in that case. Even
> the preamble correlation fails, it barely sees anything substantial in
> the air at the RF end.
> On the other hand, if I just disable the uhd_transmitter in the script,
> the receiver then works just about great.
> I've run the transceiver script earlier on USRP2 with the eth driver -
> could it be something to do with the UHD? Is it possible that the
> transmitter is in some way locking the receiver?
> P.S: Individually, tx and rx work just fine.

You did not mention which daughterboard you're using. If it's the
XCVR2450 db and you continuously transmit you sort of block your
receiver indeed. That's because the XCVR2450 is only half-duplex.


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