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

If I had to guess from the photos, I would try the resistors on standoffs next to the 20K pot at the bottom of the photo OSC_02. I assume the pot is the frequency adjustment. On Thu, Oct 25, 2018 at 8:38 PM paul swed wrote: > Hello to the group. > Ulf looks like a lot of people are trying to

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

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

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

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

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

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

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

It seems rather drastic to scrap a basically working unit for lack of info. If you can't find anything, then there's a wide range of possibilities - you've got nothing to loose then, so try tweaking the circuit design a little. It should be evident where the coarse tuning and oscillator

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

Hi Ulf, I will be happy to help you with the repair. I do have a B5400, which is a predecessor of the BVA series. I had it completely dismanteled some years ago. It has a significantly different design though. Nevertheless, I'm into OCXO stuff, and I might be able to help, probably only by having

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

Those are excellent images. Just needs a shot of the track side of the larger board. On Thu, Oct 25, 2018 at 8:38 PM Azelio Boriani wrote: > Images of the 8600 can be found here: > > A paper on the 8607 BVA with the oven schematic is here: >

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

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 wrote: > Hi > > Even with an “account”, most oscillator companies will not supply internal > details on

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

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

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

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