[time-nuts] Z3801A EFC Error

SAIDJACK at aol.com SAIDJACK at aol.com
Sun Jul 10 19:50:47 UTC 2011


Hi John,
 
use gravity.
 
Turn the unit upside down, and see if it makes the error go away. Try all 6 
 faces.

Maybe you find one where the g-sensitivity of the crystal brings the  efc 
to below 90% again.
 
Easy and non-invasive to do. You may see a couple of ppb change in crystal  
frequency as you turn the unit over.
 
bye,
Said
 
 
In a message dated 7/10/2011 08:42:15 Pacific Daylight Time,  
ed_palmer at sasktel.net writes:

>  It's possible that the EFC could keep trending downward as the unit 
>  stabilizes, and if that continues to be the direction there should be 
>  no problem.  But if it starts to go up, I'll run out of tuning room  
> soon. Assuming there's no other hardware problem, I'd think the  normal 
> way to address this would be to twiddle the oscillator's  coarse 
> frequency trimmer to get it centered in the tuning  range.
>
> Before I tear into the box, is there a coarse frequency  adjustment 
> accessible on the dual-oven 10811?  If that's not an  option, any other 
> suggestions on what might be going wrong and how to  cure it?
>
> John




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