1rv4
Joined: 11 Sep 2006
Posts: 24
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 Posted: Sun Jul 07, 2013 8:02 am Post subject: Jabiru alternator noise-what really causes it? |
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Hi All
A friend of mine has purchased a Zodiac 601 with a Jabiru engine. The problem was originally lots of noise in the headsets. We rewired the grounding , installed a forest of tabs on the firewall proper ground strap to the engine. This cleared up all the noise and the receive side of the radio is clear. The problem now is when transmitting there is a loud side tone type noise along with the verbal transmission, this noise gets worse with higher rpm.. The transmission of voice is clear and fairly loud, but the hum that accompanies it is very annoying to controllers. We disconnected the alternator (dynamo) and the noise disappears. The alternator puts out about 15 amps and is a bit on the small side for his application. Jabiru suggests twisting the two alternator wires together which we did and we also shielded them with no change. My question is what actually causes this, and is there a way to get rid of it? It is a Microaire radio, using the built in intercom. I did try a capacitor on the main bus to ground with little or no effect.
Thanks Chris
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