[time-nuts] End of Range Oscilloquartz 8600-3

[Dana Whitlow]

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 at 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_palmer at 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_r_k at 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
> >
> >
>
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