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/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
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