[Heathkit] OT: Philps PM6673 120 MHz counter / OCXO references

[Tom Frobase]

I took a different approach, using a precision oscillator left over from a
cell site and a GPS both found on eBay i constructed a GPS trained
oscillator and then synced all my stuff.  tom, N3LLL

On Fri, Mar 6, 2015 at 3:51 AM, Robert Myers <rsmyers at rogers.com> wrote:

> For my Philips PM6673 (120 MHz frequency counter) there is an optional
> 'precise' 10 MHz reference OCXO with part # PM9691 that can be easily
> installed.  I know this because it is listed in the PM6673 manual that I am
> reading as an available option; and the manual shows how to install it
> (certainly it would be better than the basic XTAL reference oscillator in
> there now).
>
>
>
> Now, I have noticed there also exists out there an optional 'ultra precise'
> 10 MHz OCXO with part # PM9692.  But I can't quite tell if it would fit
> into
> my PM6673 in exactly the same way as the aforementioned PM9691 (i.e., with
> the same mounting screws, and using the same voltages to run it, same form
> factor, same wiring, etc.).  I can't tell for sure because I don't see that
> one listed as an optional OCXO in any PM6673 manuals that I have come
> across.
>
>
>
> It could be that I simply have a manual for the PM6673 that is not quite
> the
> most recent - and that while the 'ultra precise' PM9692 OCXO is not listed
> in *that* manual, it may indeed be shown as a listed option in a more
> recent
> manual.  I don't know.
>
>
>
> It could also be that the 'ultra precise' PM9692 OCXO is indeed a direct
> replacement for the (less) 'precise' PM9691 OCXO, and so fits nicely into
> my
> PM6673, but that this became available as an option after the most recent
> PM6673 manual had been printed, and so is not listed as an option in *any*
> of the PM6673 manuals - even though it is.  I don't know.
>
>
>
> Does anyone know for sure if the 'ultra precise' optional PM9692 OCXO can
> be
> installed exactly the same as the (less) 'precise' optional PM9691 OCXO in
> my PM6673?
>
>
>
> Thanks,
>
> --- Rob Myers, VE3JQL
>
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