I have mounted OCXOs, Rbs, and PLOs on small rubber motor mounts - the
kind like for fan vibration reduction and such. The problem is that it's
more of a guessing/empirical task, with no idea of the actual
susceptibility of the device, or the mounting attenuation specs or
degree of improvement, without doing actual mechanical vibration tests.
If you have access to a commercial shake table or driver, you can
readily make such tests. You can make crude DIY shaker setups with
motors or big loudspeakers to rattle things around, and with proper
instrumentation, measure the acceleration, displacement, frequency, etc.
It can get quite complicated though. In any case, with DUTs like these,
you also have to isolate the effects of magnetic emissions from the
mover, from the true mechanical displacement effects, by adequate
shielding and distance, and making comparative measurements. It's a lot
of stuff to go through.
I think the simplest approach, and most effective in all axes, would be
to mount the unit in a box of rubbery foam padding material. Of course,
with an OCXO, you don't want it to insulate too well - the power has to
be dissipated, and the foam has to handle the operating case
temperature, so the thermal and material issues would need to be worked out.
If the available space is too small for at least a cm or so foam all
around, you can look for small vibration isolation mounts, which should
be available in all sorts of characteristics. Another possibility is to
suspend the unit assembly on a thin rubber sheet, or from metal
expansion springs or rubber o-rings tensioned in opposing directions as
needed. For metal springs, you'd want to use lightest "k" ones as
possible, that will adequately support the mass, with bits of foam
shoved inside them to dampen self-resonances. Anyway, there are a lot of
of options, but you still won't know how well they work without actual
testing.
Ed
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