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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

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

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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