[time-nuts] Muffin Fan and Rb Oscillator

[Magnus Danielson]

On 17/07/11 20:45, Richard W. Solomon wrote:
> If I use a Muffin Fan to cool the Rb (both are mounted in the same box,
> in close proximity to each other), will the noise and/or vibration affect
> the stability of the Rb oscillator ?

You can expect the vibrations to be affecting the crystal oscillator of 
the rubidium, and while low-frequency part will be captured by the 
control loop, higher frequency will not so sidebands is not completely 
ruled out.

If you mount the fan and mount the rubidium with suspension you should 
kill most of that without too much effort.

Still, best way is to measure and decide if the side-bands is 
prohibiting for your use or not.

Long-term frequency should be fairly fine if you use a sensible control 
loop with gradual speed control and not too high PWM noise.

Cheers,
Magnus