On 10/06/2017 03:33 PM, Piotr Krysik via USRP-users wrote:
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
What is on this image is not normal - i.e. much better phase offsets I
can get on two synced RTL-SDR dongles, working under patched driver.
Questions:
1. Have anyone synchronized USRPs B210 up to having constant phase
offset between the devices?
2. If yes - how?
Best Regards,
Piotr Krysik
One thing to note is that UHD *DOES NOT* do timestamp alignment across
multiple UHD container objects, so you can expect there to be a random
phase-offset between the two halves in this scenario every time you run.
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