Dear Sarah,
with 50 dB attenuation in place, you'll definitely want some gain! Best regards, Marcus On 09/18/2017 02:36 PM, Sarah Tran via USRP-users wrote: > > Hello! > > > > I am trying to use 2 N210's connected by a MIMO cable to execute the > uhd example program txrx_loopback_to_file. I have one host machine and > would like one SDR to transmit the signal and the other SDR to receive > it to a file. I would like to eventually modify the code so that I can > make a bit error rate tester between the two N210's, but I was trying > to get the threading to work first. > > > > I have the args: --tx-args="addr=192.168.10.2" > --rx-args="addr=192.168.10.3" --type="float" --nsamps=1e6 > --tx-rate=5e6 --rx-rate=5e6 --tx-freq=900e6 --rx-freq=900e6 > --tx-ant="TX/RX" --rx-ant="TX/RX" --ref="mimo" --wave-type="SINE" > --wave-freq="2000" > > > > I am using matlab to convert the binary file "usrp_samples.dat" into a > complex array and I plot the results. I have attached the plot. > > > > The results I get from the receive function do not resemble a sine > wave; it looks more like noise. I have 50 db (50 ohm) attenuation > inline with the cable that is connecting the two usrps (I am not > actually transmitting over the air). However when I run the code, I > see that LED’s indicating that they are transmitting and receiving as > they should, but the results are not what is expected. > > > > I am fairly new to usrp and C++, so any help or direction as to what > could be the problem would be greatly appreciated. Thank you for your > time! > > > > -Sarah Leony > > Electrical Engineer > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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