radio noise
On Nov 26, 9:18*am, Orval Fairbairn
wrote:
In article
,
*et wrote:
I have a radio question. * Glasair 1TD with Icom radio, older headset..
When the engine is running and charging 14.5 volts the radio howls
when I transmit. * Engine off, battery voltage, no noise. * *If I put
a small screwdriver in the small hole in the headset and turn it down
1/2 turn, no noise. * If I then take the headset and plug it in my old
Cherokee, it won't transmit until I turn it back up.
Are all headsets this voltage sensetive? * Or just older ones? *Is
there a fix?
thanks
Ed
You need a capacitor between the alternator o/p and ground, to suppress
noise. All the aviation supply houses sell noise suppressors.
It's not that kind of noise, it's a loud howl when I try to transmit,
receives great. It will also howl after I shut down the engine,
until the battery voltage drops a little, then it transmits great.
Never does it when receiving.
Ed
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