[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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