Thanks, Marcus. You're absolutely right. I didn't read carefully enough. Very Respectfully,
Dan CaJacob On Tue, Nov 11, 2014 at 11:33 AM, <mle...@ripnet.com> wrote: > Dan: > > That's generally good advice, with the single exception of the BASIC/LF > card family--they don't have any gain--they're just ADC/DAC buffers, so > it's generally safe to loop them directly. > > > > > On 2014-11-11 11:27, Dan CaJacob wrote: > > 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 >> >> > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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