[time-nuts] FEI-5660 Rubidium Oscillator

Bob Camp lists at rtty.us
Fri Mar 28 07:33:07 EDT 2014


Crystals are susceptible to vibration. That’s pretty well documented. They have resonances in the mount structure. They have a 2G tip sensitivity. 

Audio when it “impacts” an oscillator induces vibration. If your noise source is a rocket engine, then the vibration is “non trivial”. You do indeed see phase noise on the oscillator from audio …


On Mar 27, 2014, at 11:42 PM, Tom Van Baak <tvb at LeapSecond.com> wrote:

>> More seriously, I'm assuming you're advocating rock for the thermal mass 
>> and/or mechanical.  What about a 100 pound box of sand?
> Mechanical. I figured a OCXO might be susceptible to microphonics, especially in a recording studio. But if it's down to the level of 1 lsb of the digital sampling, then no worries.
> Has anyone on the list ever measured this effect, even on a cheap crystal?
> /tvb
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