[time-nuts] Adding EFC

[Brian Kirby]

The original Shera GPS controller was designed for the HP10811 
oscillator in their frequency counter.

Brooks Shera, W5OJM, A GPS-Base Frequency Standard

On 10/3/2010 5:45 PM, Perry Sandeen wrote:
> List
>
> The HP 10811 type oscillator is used for both the HP 5370B TIC, the HP 3586B SLV with the high stability option, and the HP 5335 frequency counter which I have.  But none of them make use of the EFC option that I’m aware of.  They do use EFC for the HP 3336B frequency generator that I have.  Considering the instruments cost it seems like a strange omission to me.
>
> I can get a manual adjustment down to an error of about .04 Hz at 15 MHz compared to my Lucne GPS using a great deal of patience and having a bit of luck.
>
> Can or has anyone hacked these instruments to add EFC?  I don’t mind being the firs to try but I’d rather not re-invent the wheel.
> Regards,
>
> Perrier
>
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