[time-nuts] time-nuts Digest, Vol 101, Issue 152

Bob Camp lists at rtty.us
Sun Dec 30 22:27:07 UTC 2012


A quartz crystal in insensitive to magnetic field. This being Time Nut's that's not the whole story. Ferrite core inductors can indeed exhibit a bit of static mag field sensitivity. Your OCXO may or may not have some in it.

In the case of AC fields you can always have induction. There will be a level that puts enough EMF on the EFC line to create a sideband. It's likely there are other places in the circuit that this or that EMF could create issues. 

All that said, the magnetic fields from a normal small fan are unlikely to give a conventional OCXO much trouble. 


On Dec 30, 2012, at 2:35 PM, Attila Kinali <attila at kinali.ch> wrote:

> On Fri, 21 Dec 2012 09:53:51 -0800
> Said Jackson <saidjack at aol.com> wrote:
>> Volker, I wonder if you also see fan-induced spurs in the phase
>> noise from 1Hz to 100Hz. I would not be surprised if the fan
>> vibration adds significant spurs to the 10811A crystal.
> How susceptible are OCXOs on magnetic fields?
> Most fans (even "computer" fans) have a quite strong, changing field.
> Or is that insignificant compared to other sources of noise?
> 			Attila Kinali
> -- 
> There is no secret ingredient
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