On 2026-01-14 14:57, David Raeman via USRP-users wrote:
Hello,
I have a project currently hosted on a USRP E320 that involves
distributed signal coherence. During development I sometimes do
over-the-wire testing using an Octoclock’s 10MHz and PPS outputs to
synchronize multiple radios on the bench.
I’m starting to investigate the viability of rehosting this
application on a USRP B206mini to reduce size and cost. As far as I
can discern, this radio only has a single port that can accept either
a 10MHz reference input or a PPS input. Is it possible to somehow use
the radio with both clock and PPS outputs from an Octoclock with
out-of-the-box UHD? If not, would it be viable for me to add a bit of
FPGA logic and UHD tweaks such that software can specify a GPIO pin as
the PPS input while using the SMA as the 10MHz input? Or are there
hardware or systems constraints that would preclude that approach?
Thanks!
David Raeman
Synoptic Engineering
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You could probably add some FPGA functionality to implement a separate
PPS input.
But I should warn you that the clock servo in the B205x series is simply
NOT UP TO THE TASK of building-out multi-unit coherent applications.
The mutual phase-noise is way too high. The B205 was never intended for
such applications to begin with, and the clock servo just doesn't work
that well._______________________________________________
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