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Subject: Re: Jabiru alternator noise-what really causes

 
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1rv4



Joined: 11 Sep 2006
Posts: 24
PostPosted: Mon Jul 08, 2013 5:26 am    Post subject: Subject: Re: Jabiru alternator noise-what really causes Reply with quote
“ Is the microphone jack electrically isolated
from the airframe? Further, does it's ground wire
route in parallel with mic audio and ptt lines
back to the radio?”
Not sure about the mic audio and ptt grounds but will check when I get back from holiday. We did isolate the jacks.Noise is the same whether its intercom or radio, only time it disappears is when we take the alternator out of the mix.

“ P.S. Where are the alternator and battery
grounded? To the Forest=of=Tabs?”

The battery is grounded on the engine firewall side to the forest of tabs, the alternator is case grounded to the engine, it has two leads from it that go to the regulator. These leads are twisted for their full length. It has been described as a dynamo more than an alternator, where the rectification takes place at the regulator? These two wires are carrying A/C as far as I can tell.

Thanks for the input

Chris
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