[time-nuts] Adjusting nominal frequency of FTS 1200-100 OCXO?

Christopher Hoover ch at murgatroid.com
Mon Sep 19 20:47:13 EDT 2016


Hi Adrian,

Thank you for your reply.

Is this board deep inside the OCXO?

I haven't ventured past the  output amplifier board stack at the "front."
The styrofoam insulation seems pretty fragile from age and heat.

-christopher
73 de AI6KG


On Mon, Sep 19, 2016 at 12:28 PM, Adrian <rfnuts at arcor.de> wrote:

> Christopher,
>
> my 4060 has been locking exactly 0.5 Hz off of the correct frequency.
> The 1000B has had a contact problem on the edge connector.
> Over the years, an insulating black layer had built up between the
> solder and the gold plating of the contacts.
> I had to re-solder each of them carefully twice to get it working reliably.
>
> Regards,
> Adrian
>
> Christopher Hoover schrieb:
> > I've been debugging a FTS 4050 with the 5000M module.
> >
> > It looks like the problem is the FTS 1200-100 OCXO.   It seems to have
> aged
> > to the point that it is very low in frequency.   (Chuck Harris reported a
> > similar situation a long time ago.)
> >
> > I have it out of the 5000M and determined that I need to give it +8.8V on
> > the control to get it within 50uHz of 5 MHz.
> >
> > The power draw after a short warm up is < 2.5W (on this hot day); it
> looks
> > like the oven is behaving.
> >
> > Has anyone figured out how  to adjust the nominal frequency of an FTS
> 1200
> > -100 to recover the EFC range?
> >
> > Also, anyone have a schematic for any model of the FTS 1200?
> >
> > Thanks,
> > -christopher
> > 73 de AI6KG
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