[time-nuts] Looking for Z3801 OCXO

[ws at Yahoo]

John

If it is off very far the first thing I'd suspect is the inner oven.

 

Assuming the freq is still stable and low noise, one option is to rewire it,
and make the freq adjustment accessible.

Removing the original inner wiring wrap also provides many other advantages,
and no down side that I've found.

After modifying several, it now takes me about an hour to do. 

>From the outside you can not tell that it has been modified, unless I change
the crappy little blue shielded RF and EFC cables that it originally comes
with, which I now always do. 

It takes about five minutes on a correctly modified unit to readjust the
frequency. The adjuster nut and hole is accessible after temporarily
removing the bottom outer cover, thru a 3/8 inch access hole drilled in the
bottom of the outer oven that is placed *under* the bottom heater flap. 

It is easy to adjust thru the bottom of the unit and can be done without
powering down or disturbing the oscillator or either oven's power.

 

Picture attached of modified inside cabling, before the two shielded cables
are added.

No mess. Any goo gets cleaned up with alcohol or thrown away.

 

ws

 

 

********************

John Posted:

"Looking for Z3801 OCXO"

 

I have a Z3801A whose oscillator has aged out of correction range, and 

thus throws an EFC alarm.

 

Anyone have a still-in-range double-oven HP10811 from a unit that died 

for another reason?  If so, I'd be happy to acquire it.

 

(I tried disassembling one of the double-oven 10811s years ago and found 

that extracting the oscillator can from the outer oven, heater, and 

gooey insulation made such a mess that it would be impossible to 

reassemble.)

 

Thanks!

 

John

 

 

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