[USRP-users] Frequency offset between two USRPs B210 synchronized with use of Octoclock-G

Piotr Krysik perper at o2.pl
Fri Oct 6 15:47:17 EDT 2017


W dniu 06.10.2017 o 21:33, Piotr Krysik via USRP-users pisze:
> Hello everyone,
>
> I synchronized two USRPs B210 with use of Octoclock-G and the attached
> gnuradio-companion flowgraph.
>
> I've connected signal generator generating sinusoid to both devices (it
> was on frequency 694.5MHz while USRPs were tuned to 694.3MHz, signal
> power was about -40dBm). What I would expect is to see constant phase
> offset between signals received by both USRPs (perhaps changing slightly
> with temperature etc.). However what I see is constant changes of phase
> that corresponds to frequency offset between two devices. Moreover this
> frequency offset changes significantly from one execution of a flowgraph
> to another (look at the image):
>
> relative phase of two B210's
>
Missing image of phase offsets in the attachment.

Best Regards,
Piotr Krysik


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