[time-nuts] FEI-5660 Rubidium Oscillator

[EWKehren at aol.com]

All Rb's have XO's and with the exception of the HP5065C all Rb's influence 
 long term stability only the only exception is the HP which uses a TC 
below  0.1.sec, and as Corbe demonstrated ADEV is controlled below 1 sec. by the 
cell.  The same can not be said with other Rb's.
Bert Kehren
 
 
In a message dated 3/28/2014 7:33:45 A.M. Eastern Daylight Time,  
lists at rtty.us writes:

Hi

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  …

Bob

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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