[time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3

[paul swed]

I took a quick look at the spec sheet.
It appears coarse adjustment is an option M and would actually be a pot.
That speaks to another tuning diode for coarse? Or a pot on pot arrangement.
That sounds ugly.
Regards
Paul
WB8TSL

On Fri, Dec 8, 2017 at 10:17 AM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> It is quite possible that nothing is actually broken and that the crystal
> has simply drifted
> outside the tuning range. It should be pretty easy to spot the coarse
> tuning device once
> the package is open. I would bet you will find a selected capacitor across
> the coarse tune or in
> series with the coarse tune. Changing the value of that cap should bring
> things back on
> frequency. I would avoid changing caps across the EFC tuning diode.
>
> Bob
>
> > On Dec 8, 2017, at 8:05 AM, Ulf Kylenfall via time-nuts <
> time-nuts at febo.com> wrote:
> >
> >
> > Gentlemen,
> > We have an Oscilloquartz OCXO 8600-3that cannot any longer be adjusted
> into 5,000,000 Hz.It is about 1 Hz out of 5 MHz and turning
> coarse/fineadjustment potentiometers cannot bring the frequencyinto its
> specification.
> > Oven temperature is about + 80C accordingto the thermistor and the
> operating voltageis at 24 VDC.
> > Have Googled but the only thing that turns upis datasheets w/o any
> details.
> > Before I take it apart and start lookingfor obviously broken components,
> isthere anyone that has a CLIP on this unit?
> > 73
> >
> > Ulf Kylenfall - SM6GXV
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