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

[Bob kb8tq]

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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