Re: Alternator noise on Xmit only

So running a grounding wire from the jack to the radio tray is not enough?

I installed a jack to run the audio from my 496 to the audio panel in the 
radio stack and at first just used the instrument panel as ground.  I did 
get a significant amount of noise.  Then I added a ground wire from the
plug 
to the radio tray and got rid of the extra sound effects.

-- 
Best Regards,
Mike

http://photoshow.comcast.net/mikenoel


"David Lesher" <wb8foz@[EMAIL PROTECTED]
> wrote in message 
news:g4diiv$adp$1@[EMAIL PROTECTED]
> 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.
>
>
> -- 
> A host is a host from coast to coast.................wb8foz@[EMAIL PROTECTED]
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