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

Bob kb8tq kb8tq at n1k.org
Tue Dec 12 17:44:57 UTC 2017


Hi

I would bet that the design changed a bit since 1983. That is a “long time ago” 
in terms of OCXO design. Since we are picking up this stuff surplus or pulling 
it out of older gear, who knows what era this or that example might come from. 

Bob

> On Dec 12, 2017, at 12:32 PM, 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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