[time-nuts] 5370A clock buffer board jitter/noise?

Bob Stewart bob at evoria.net
Tue Mar 22 23:37:00 EDT 2016


I started getting noise spikes of up to 500ps on my 5370 the other day.  When I switch to external clock and use the PRS-45A, the noise goes away.  In fact, the noise issue is way better than with the 10811.  I swapped in a different 10811, and the noise doesn't seem to have returned, but it was intermittent, so I may not have waited long enough.  However, even when the 500ps spikes aren't there, both 10811s have too much noise, compared to the PRS.  So, is there some common cause for this on the clock buffer board that anyone's run into?

Also, I did pop the bottom off the 10811 from the 5370, and I noticed that the thermal fuse seems to have very thin wires compared to the socket holes it plugs into.  Could this be a source of additional noise?

Bob - AE6RV


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