[time-nuts] FEI FE-5650A and FE-5680A caution

Murray Greenman Murray.Greenman at rakon.com
Thu Apr 7 20:32:11 UTC 2011


Jerry has described the situation fairly well. You take pot luck, and
the Chinese supplier does not know which are which.

Out of four units I have, two are remote controllable, one is fixed at
(reasonably close to) 10MHz, while the fourth had no output at all. I've
since discovered that this last unit has a 1pps output, and I was also
able to recover a useful 60MHz output from it by digging inside.

If you end up with a fixed ~10MHz unit, it's still useful as a portable
reference. It doesn't matter what the exact frequency is, so long as
it's stable and repeatable (within your measurement requirements) and
has a nice low ageing rate.

Murray ZL1BPU




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