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

[Chris Howard]

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