Re: [Discuss-gnuradio] Problems when receiving after transmit

[Dan Halperin]

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I should add that I've duplicated this with multiple USRPs of different
revisions and different revisions of the RFX 2400 (the 12-26-2006
version as well). So I don't think I broke my hardware... I've also
duplicated it at multiple frequencies.

- -Dan

Dan Halperin wrote:
> Just-powered on USRP rev 4.2 with RFX2400 rev 2-6-2006. Current SVN.
> 
> usrp_rx_cfile.py -f 2.485G -d 8 -s pre.dat
> usrp_siggen.py -i 16 -f 2.485G
> usrp_rx_cfile.py -f 2.485G -d 8 -s post.dat
> 
> In the first set of data, the noise level is what I'd expect and
> everything works hunky-dory. After the siggen, however, it all goes
> haywire, the noise floor becomes huge even though an adjacent USRP sees
> nothing. See
> <http://www.cs.washington.edu/homes/dhalperi/random/pre_and_post.jpg>
> for graphs of the raw sample amplitudes.
> 
> Can anyone duplicate / explain this? Thanks!
> 
> -Dan

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