Hello Teemu, Have you set the B200 to use the GPSDO as the time and frequency source? Not doing so could be the cause of the frequency offset. http://files.ettus.com/manual/page_sync.html
Regards, Derek On Tue, May 22, 2018 at 12:41 PM, Teemu Veijalainen via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi, > > > > I’ve 2x USRP B210 with board mounted GPSDO (TCXO). I’m controlling the > USRP’s with MATLAB and configured the other to send CW at 3.75GHz and other > to receive with the same frequency. The radios are connected with 50cm SMA > cable and 30 dB attenuator. > > > > I know there should be some frequency offset, however the received signal > is around 1.7 kHz off and I think that is too much. The GPSDO should > provide accuracy of 75 ppb in unlocked condition so I’m expecting to see > frequency offset maximum a few hundred Hz. Therefore, I’m asking is this > normal or am I missing something? > > > > Br, > > Teemu > > > > USRP Configuration > > - Tx&Rx InterpolationFactor=512 > - Tx&Rx MasterClockRate=5120000 > - Tx Gain=55 & Rx Gain=64 > > > > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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