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rexjan(at)bigpond.com
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 Posted: Sun Mar 26, 2006 5:36 pm Post subject: Radio Noise |
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Michael Laundy <mikelaundy(at)yahoo.co.uk> wrote:
..............
| Quote: | Had major problems with the radio (brand new ICOM
IC A24E). Very loud interference almost impossible
to hear ground stations, and they told me after
landing my transmissions were unreadable just a very
loud buzz every time I transmitted. I am not sure if
it is aircraft interference or a fault on the
radio. has anyone else had this problem?
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Hi ! Michael,
I am a retired electronics tech but sometimes that still doesn't help. Anyway I have an Icom A20 mounted on my panel. It works fine now ! It is fed power from the plane and has an external antenna. It is connected through the intercomm. I bought the plane secondhand and it came with lot's of noise in the radio and intercomm. I made up a filter cicuit to feed the power to the radio and the intercomm. This solved all my problems. The circuit is very simple and anyone with very basic electronics skills could make it. If you would like the circuit contact me direct and I'll send it to you with a few comments.
Now another instance we just sorted for a friend with a Rotax 277 in a 95-10 Ultralight. He uses a Delcom AIR960 handheld radio in the plane. He has a headset on it and that's it. With the engine stopped or at low RPM it was fine but by the time you got up to arond 5,000 RPM or more no one had a hope of deciphering his transmissions. He could recieve fine. We tried lot's of things with no luck. His radio was fine in my plane and my radio was fine in his. Just his radio in his plane and only on transmit at higher RPM was a problem. I have David Clark HD10-30 headsets and we tried one of mine in his plane with his radio and that cured the problem. Don't ask me why because I can't explain that but it did. Anyway in the end we just changed his microphone for a David Clark M-1 and it's fine. We tried many other headsets and none were any good. Some worse than others. As I say I can't explain this but I am passing it on in case it helps.
Rex.
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Rex Hefferan
Joined: 10 Jan 2006
Posts: 147
Location: Olney Springs, Colorado USA "NOT a Kitpig"
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