[time-nuts] HP10811 losing EFC

J. Forster jfor at quik.com
Sat Jan 16 00:08:08 UTC 2010


Here's a guess: Is there an electrolytic capacitor that bypasses the EFC
to GND? Maybe that's bad. I don't have a schematic.

-John

==============



> Hi,
>
> I have two HP10811 oscillators that do not respond to EFC voltage.
> The latest to fail had been quite accurately set against a TBOLT,
> one morning (after being on standby in a HP5328A) it was off frequency
> and would not shift with EFC but would adjust with the coarse adjust.
> I have bought in two Phillips varicap diodes, BBY40 and BB149A,
> but before I did some damage fault finding in the HP10811s  I thought
> it wise to ask for any advice that was available.
> While I am playing with them I may try to readjust the temperature
> setting
> of the oven to get on top of the turnover. Can anyone point me to
> that article?
>
> cheers, Neville Michie
>
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