[time-nuts] Still looking for a schematic drawing for Oscilloquartz 8600-3 (945.860.011.03 S/N 422)

Mark Goldberg marklgoldberg at gmail.com
Thu Oct 25 15:38:21 EDT 2018


I agree they likely won't provide a schematic and will want it back for
repair. If it is a proprietary design for someone, they may not even repair
it for you and certainly won't give you any info. I was at least able to
get a little info from Wenzel about a similar oscillator I was looking at
and they gave me hints about what the one I had was not, basically not
telling me info but keeping me from heading down the wrong path. If you ask
nicely via email and are understanding about their situation with
proprietary products, maybe they will be of some help.

I have reverse engineered a couple of oscillators. You don't have to
reverse engineer the whole thing, just the frequency adjustment section. I
don't know anything about this oscillator but you can determine what the
available adjustment is, a pot or a trimmer cap. If it is a pot, is there
another resistor that sets the course adjustment? If it is a trimmer cap,
there is usually a parallel cap that sets the course adjustment. Possibly
those could be replaced with different values to get the adjustment range
back. Worth a try.

If you can look at the circuit around the crystal, you likely can determine
what the oscillator topology is.

Can you tell if the oven is working? Typically it will draw more current on
startup and then reduce the current draw after a while when it gets to
temperature. I've found broken heater wires before.

Regards,

Mark


On Thu, Oct 25, 2018 at 11:26 AM paul swed <paulswedb at gmail.com> wrote:

> Ulf
> I have no details. But perhaps off list we could reverse engineer it.
> Simply a suggestion. Especially since you have it open.
> Regards
> Paul
> WB8TSL
>
> On Thu, Oct 25, 2018 at 2:15 PM Bob kb8tq <kb8tq at n1k.org> wrote:
>
> > Hi
> >
> > Even with an “account”, most oscillator companies will not supply
> internal
> > details on their product. That’s in part
> > to protect their IP. It also reflects the complexity of tracing back to
> > exactly what doc’s apply to an older unit. The
> > normal drill is for you to send it back and they take a look at it. They
> > then quote a repair charge and you either
> > go ahead with it or have them send it back.
> >
> > Bob
> >
> > > On Oct 25, 2018, at 1:56 PM, Ulf Kylenfall via time-nuts <
> > time-nuts at lists.febo.com> wrote:
> > >
> > >
> > > Many monts ago I approached the list regarding an Oscilloquartz
> > 8600-3(945.860.011.03 s/n 422) 5 MHz Ovenized Crystal Oscillator. It had
> > aged and was 1 Hz off and couldnot be braught back to 5.000.000 MHz.
> > > Since I did not have "an account" with Oscilloquartz or what they are
> > calledtoday, I was not able to get any help from them.
> > > There was one answer off the list from someone who could possibly
> > helpbut that person either forgot or did not have any relevant
> > informationto share.
> > > A box with the dismantled unit has been laying on my shelf for months
> > and I am therefore asking again. If there is no information about
> thisunit
> > available I will scrap it. I do not know of any other forumto ask.
> > > Best Regards
> > >
> > > Ulf KylenfallSM6GXV
> > >
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