I looked at the photos, but can't make any sense of your comments about the multivibrator. Was this a joke?
Dana On Tue, Dec 12, 2017 at 11:37 AM, Bob Albert via time-nuts < time-nuts@febo.com> wrote: > You found the secret. There is no RF wiring to the crystal. The > oscillator frequency is determined elsewhere, with a free running > multivibrator that is approximately on the right frequency. All this talk > about precision is baloney; the circuit is stable enough to fool even the > experts. > And it's not even April 1 yet. > Bob > On Tuesday, December 12, 2017, 9:32:44 AM PST, Ed Palmer < > ed_pal...@sasktel.net> wrote: > > It sounds like yours is different from my 8601. How old is yours? From > the label inside it looks like mine is from 1983. > > Internal pictures are here: > > http://s701.photobucket.com/user/edpalmer42/library/Oscilloquartz%208601% > 20Oscillator > > If you click on 'view as story' you'll see some comments that I added to > the pictures. > > Ed > > On 2017-12-12 11:00 AM, <ulf_...@yahoo.com> wrote: > > Emailed Oscilloquartz that now has another name: Advaoptical... This in > my capacity as aresearch engineer at Onsala Space Observatory.And the > oscillator is at my work bench. Nothingprivate/hobby about this. > > The answer was that since we do not have a service agreement,they would > not disclose any information. > > (Compare this with Keysight who has a free downlad area for oldmanuals. > IMO the Keysight approach benifits their businessin the long term). > > So... > > I went along and started to dissassemble the 8600-3. > > The outer case was easy. Inside is a PCB with RF buffersand temperature > regulation circuitry. > > Then there is a thermo bottle with the ovenized oscillator.This unit is > connected to the PCB using two flex cables. > > The oscillator unit can simply be extracted from thebottle using an > Metric 3 mm screw lightly screwed inone of the holes in the oscillator > assembly. > > The assembly can be accessed by carfully unscrewingthe flex-cable end > from the other mechanics. No needto touch the three small screws at the lid. > > Now it is starting to get intersting. I have not foundthe RF wiring into > the crystal. The PCB in this unitseems to deal only with temperature > regulation.Possibly, the RF is routed together with some heaterwinding. > > Or the crystal and the oscillator parts is sealedin such a way that > there will be no wayto dissassemble it. There are several thermistorsglued > inside to various parts of the oscillator/ovenassembly. That will make any > further attemptsdifficult as the connecting wires are thin and delicateif > they needs to be unsoldered. > > The construction is a nice piece of engineering.I'll give them that. > > Right now, I cannot see any typical oscillatorcircuitry (pF, nH, RF > transistors) etc. > > I think I'll contemplate on the next movefor a day or so... > > > > Ulf Kylenfall > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.