Hi, The problem was solved.
It seems that I didn’t select GPSDO as source. MATLAB doesn’t allow to select GPSDO (or I don’t know how). With GnuRadio I was able to select GPSDO and the frequency error is now around 30 Hz in 3.75GHz. Br, Teemu From: Derek Kozel [mailto:derek.ko...@ettus.com] Sent: Tuesday, May 22, 2018 3:07 PM To: Teemu Veijalainen <teemu.veijalai...@outlook.com> Cc: usrp-users@lists.ettus.com Subject: Re: [USRP-users] B210 Frequency Offset 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<mailto: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 [cid:image001.png@01D3F2B4.E60DB750] _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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