07-10-2012 04:31 AM
I'm trying to built a little radar with the USRP 2920 ..
but I have a problem.
I connect the two port of tghe USRP (TX1 RX2) with a low loss cable of 50 cm..
after transmitting a chirp signal, sometimes i found my signal on rx port shifted by 180 degrees .. totally reversed
it's possible that is a problem of the LNA on board of the USRP ?.
I Had this problem also with the USRP 1 of Ettus
Solved! Go to Solution.
07-10-2012 10:31 AM
Can you post any pictures of what you are receiving and what you are transmitting? When does this shift happen and when does it not happen?
Since you also had the same problem with the USRP1 I would suspect the setup you have, maybe you are seeing a physical reflection or multipath interference.
I would try a loop back test using the 30db attenuator that comes with the USRP and see if it the shifting still persists.
07-11-2012 05:19 AM
07-12-2012 08:18 AM
Are you continuously sending the chirp signal or are you sending it only a few times (finite)?
It looks like you are only using one USRP to both send and receive, is this correct?
07-12-2012 11:01 PM