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 <[email protected]> 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 <[email protected]> > 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 <[email protected]> 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 <[email protected]> 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 < > >>> [email protected]> 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 > >>>> > >>>> _______________________________________________ > >>>> time-nuts mailing list -- [email protected] > >>>> To unsubscribe, go to > >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>>> and follow the instructions there. > >>> > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>> and follow the instructions there. > >>> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
