Re: [Discuss-gnuradio] Noise floor falls ~5dB when TX is started

[Ruben Undheim]

Sorry, it was accidentally posted before I was finished writing... 

...To make sure that I receive well, I
made myself a simple script like this:
#!/usr/bin/
from gnuradio import usrp
u= usrp.sink_c()

and run that after I've started the board.

Does anyone have any suggestion for what might be the cause of this strange behavior?
What happens when the usrp sink is initialized that would cause the receive noise floor to fall?

Regards, Ruben

2011/5/5 Ruben Undheim <address@hidden>

I've discovered that after I turn on the USRP and start receiving there is some noise which because of some strange
reason disappear when I start the transmitting part of the board. For frequencies around 150MHz with the WBX-board
and USRP1, the noise floor is reduced by 5dB, and seriously improves reception. To make sure that I receive well, I
made myself a simple script like this:
#!/usr/bin/
from gnuradio import usrp
u= usrp.sink_c