On 06/10/17 19:47, Piotr Krysik via USRP-users wrote:
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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Hi Piotr,
While I have a slightly different h/w configuration
(2xN200, one GPSDO connected through MIMO cable (i.e. I use slightly
different time/clock sources; and 2 SBXs) and while I have modified the
Python code to use timed_commands per the ettus sync page , I have not
been able to get a consistent relative phase offset between the devices
on successive GRC runs. I have been struggling for quite a while -
hopefully, you will get a resolution quickly and I believe it might also
fix my problem!
Kind Regards,
John
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