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Insulating washers [was: Radio noise when transmitting]

 
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jdubner



Joined: 17 Jul 2012
Posts: 35
Location: Independence, OR

PostPosted: Tue Mar 17, 2020 12:39 pm    Post subject: Insulating washers [was: Radio noise when transmitting] Reply with quote

Robert L. Nuckolls, III wrote on 3/17/2020 10:07:

Quote:
?? ... > ground loop caused by mounting the microphone
?? jack to airframe without and insulating washer.

https://tinyurl.com/t4kveee

?? ...

Yikes, those are some expensive pieces of phenolic! Not in terms of other
airplane parts measured in AMU ($1000 bills) of course but certainly in terms of
dollars per ounce.

In the past a friend has turned some on his lathe from some phenolic stock I had
on hand. Like nearly all machining operations, the setup is time consuming but
"production" is quite speedy.

I have also used 0.062-inch printed circuit board material (after cleaning off
the traces) to fabricate a rectangular strip that would mount jacks through
oversize clearance holes. Image attached.

The latter technique works for 1/8-inch jacks where no insulated mount is
available AFAIK.

--
Joe
RV-8A
Independence, OR


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