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

Christopher Hoover ch at murgatroid.com
Tue Dec 12 19:11:05 EST 2017


I got into the package out of the dewar of my FTS 1200-100 without breaking
it:

https://photos.google.com/share/AF1QipPxJF0Fn6_
gSjXQzk3OhoAhvgqizxmo4A41bIdyk8FrpkNIOfW5Q5feLwLsO4od8Q?key=
NmRRejU0eEYtVUQ4ZURTMnE4cXZEOWtIVmtQZTZB

-ch
73 de AI6KG


On Tue, Dec 12, 2017 at 3:50 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> Hi Ed,
>
> Thanks for the pictures. I had to change the dewar flask on one of mine,
> so I saw about the same thing some 10 years ago or so, but memory.
> Didn't go all the way into the oscillator.
>
> The oscillator picture is mirrored.
>
> Cheers,
> Magnus
>
>
> On 12/12/2017 06:32 PM, Ed Palmer 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/Oscilloq
>> uartz%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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