Re: Alternator noise on Xmit only

MikeMl <wa7ark@[EMAIL PROTECTED]
> writes:

>> Short from microphone connector ground to chassis.

>Bingo,

>Proper installation of aircraft mic and headphone jacks requires the    
>use of insulating bu****ng where the threaded sleeve on the jack would   
>otherwise come in electrical contact with the airframe.                 

And those those who've not seen them, you need shoulder washers.



...[======| |======]
PANEL|         |****PANEL
.......[==| |==]
...[======| |======]



The outer [here lower] washer is two-step; the inner part centers the
jack in the panel hole.  Sometimes the inner [here upper] washer is flat,
sometimes it's the same as the lower. Both are usually made of phenolic
or such; but could be any insulator.

And note that if any mike jack wiggles loose/gets off-center, you can get
a short. It's an easy thing to inspect.

And if the jack is mounted on a plastic panel; you can skip the whole
issue. I don't know how many are.


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