[time-nuts] Counter OCXO behaviour

David davidwhess at gmail.com
Mon Jan 14 20:52:25 UTC 2013


The Racal Dana 1991/1992 OCXO has a big pair of pan head screws
exposed on the back.  One is coarse adjust and one is fine adjust.  I
have the TCXO version which also exposes the adjustment on the back so
you do not have to open anything to get to it.

You can see them here:

http://www.eevblog.com/forum/reviews/racal-dana-1992-teardown/?action=dlattach;attach=20937;image;PHPSESSID=a5230a2beafd27b99c07580940fe1574

On Mon, 14 Jan 2013 12:34:04 -0800, Ed Breya <eb at telight.com> wrote:

>Is it manually adjusted right at the oscillator? If so, just opening it 
>up and sticking a screwdriver in there gives it a thermal shock, and the 
>adjusted element will have mechanical stress that has to settle out too 
>- the value can change for a while.
>
>Ed



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