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

paul swed paulswedb at gmail.com
Thu Oct 25 20:37:00 EDT 2018


Hello to the group.
Ulf looks like a lot of people are trying to help.
Earlier in the thread it was mentioned that there often is a tuning cap of
some fixed value.
I have actually slightly adjusted those to fix as an example a HP 10811.
Typically its a single cap.
But it can't hurt to try changing it if you can figure out the cap.
Regards
Paul
WB8TSL

On Thu, Oct 25, 2018 at 7:14 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> One fairly real possibility - it can’t be repaired. The  tuning range of a
> BVA based oscillator is pretty
> small. It may be that the crystal has simply aged further than it can be
> tuned.
>
> Assuming the device is still operating properly, there are a lot of uses
> for a working “1Hz off” 5 MHz
> OCXO …..
>
> Bob
>
> > On Oct 25, 2018, at 3:38 PM, Mark Goldberg <marklgoldberg at gmail.com>
> wrote:
> >
> > 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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