[time-nuts] getting a grip on 10811 drift (trying to read my instruments)

[Neville Michie]

I have found a pic of the dry joint,
this one was just a dry joint with resin insulating the connection,
the other never had any solder applied.
cheers, Neville Michie






On 17/11/2012, at 11:09 AM, Chris Howard wrote:

> 
> Maybe that is my problem.  I definitely have a problem.
> 
> I am able to get the EFC to work on some occasions.
> Usually it will work if I run the trimmer all the way
> out and toggle the power.  I can then adjust the trimmer
> and get things working.  But if I give the box a rap
> the frequency jumps and I get into the "mode" of
> the EFC not working.  I can trimmer it up and it will
> look fine but no EFC.
> 
> I will check out that ferule thing.  I'm not sure what you
> are describing but will look for it.
> 
> Chris
> 
> 
> 
> On 11/16/2012 5:53 PM, Neville Michie wrote:
>> I have had two 10811 with EFC problems that turned out to be lack of soldering of one internal joint.
>> This is a large PTFE ferule with several leads including the varactor and trimmer going into it. For many 
>> years the leads all contacted but finally one lead developed an oxide film. A soldering iron fixed them very quickly.
>> The serial numbers were widely separated, so it was not an unlucky batch problem.
>> cheers, 
>> Neville Michie
> 
> 
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