[time-nuts] E1938A Frequency Adjust Question

[Rick Karlquist]

There is no trimmer.  You have to replace a fixed chip capacitor.
The capacitor is on the flex circuit that connects to the
crystal.  Schematics have been posted; ask on the reflector.
What tuning voltage were you using when you got the 6.6 Hz
low reading?  If zero, then you need to be applying some tuning
voltage.  It is unlikely that only 10 years of aging would
have caused you to run out of tuning range.

Rick
N6RK




Richard W. Solomon wrote:
> I finally got to hooking up the E1938A I got. When
> compared to my GPS based reference, I find it is
> 6.6 Hz low.
>
> Is there a frequency adjust trimmer on the board ?
> I don't have a schematic for it.
>
> Thanks, Dick, W1KSZ
>
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