Hi Lucas, You say you connected TXA to RXA directly via a cox cable? Did you put an attenuator inline? I am afraid you may have damaged your RX side by transmitting directly into it without protection. Most USRPs can be damaged with input power greater than -10 dBm. Disconnect that cable immediately and try testing the RX side alone to make sure that it is not damaged. Then, if you want to go back to a looback test, make sure that you put about 60 dB of attenuation between the RX and TX ports.
The noise you were seeing was almost certainly not a problem with your source block, but your RX being over-driven (dying). Good luck. Very Respectfully, Dan CaJacob On Tue, Nov 11, 2014 at 11:07 AM, Lucas Lopez <luckas1...@gmail.com> wrote: > hi everyone. i was working with the USRP1. I'm testing a MOD/DEMOD DBPSK. > I have only one USRP, so, i connected TX_A( from daughterboard LFTX-LF) > to RX_A ( from daughterborad LFRX-LF) with a coaxil. All system works > well without URSP but when i taste with the USRP i get so much noise and > the SNR give me -infinite. I checked the problem comes from "uhd ursp > sourse" block, that make me think the problem is the noise from URSP. some > suggestions? > Regards. > Lucas. > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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