Alan Melia wrote:
Some synth sig-gens use the reference divided down to drive the PSU (Marconi
2955 for instance) for the same reason I think

Some Rubidiums lock their pump frequency to the OCXO. This can cause harmonics on the output. I once saw it on a rubidium, the jitter was unexpectedly high for compared to what the phasenoise plot would make you expect, but when scoping the signal it was clearly seen.

Cheers,
Magnus

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