[R-1051] Frequency Standard Module

[paul swed]

Steve
The modules are quite old so lots can go wrong in the regenerative
dividers. Heck how did they ever work in the first place? Black magic.
That said The ceramic caps do oxidize with age and essentially when you
adjust them they can go totally to heck with noisy spots. If possible
obtain replacements I think ceramics are still around and they need to be
new. NOS essentially can have the same issue.
I have also seen the coils disintegrate. But that would not cause the issue
you are describing.
Good luck in the New Year.
Regards
Paul
WB8TSL

On Tue, Dec 30, 2014 at 4:44 PM, Steve Hobensack <stevehobensack at hotmail.com
> wrote:

> I am troubleshooting a spare frequency standard module. It goes squirrely
> after about 15 minutes warmup. The
>  oven and crystal are okay. The problem seems to be that one of the
> phase locked oscillators jumps out of lock. I have figured out which
> ceramic trimmer does what. Some adjust for lock, some adjust for max
> signal. I have a frequency counter and selective level meter, and I can
> power the module up on the bench with a 28v and a 20v dc supply. What
> would be a
>  typical value of terminating resistor for the outputs when adjusting
> the ceramic trimmers, shooting for maximum signal across the resistor?
> Thanks
> Steve N8YE
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