jerrytex
Joined: 10 Feb 2011
Posts: 12
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 Posted: Mon Oct 22, 2012 12:21 pm Post subject: turn coordinator causing noice in headset |
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I have had a good deal of electrical issues from strobe noise, to bad crimps that burned up wires. I have slowly but surely resolved alot of the issues. Recently I installed an LED landing light. During the course I found other wiring issues that have been resolved too. However I have strange problem now. I can hear my Falcon Electronic turn coordinator in my headset. It is whining very noticeably. What is weird is if I turn ON the landing light, the noise goes away. Turn the light off and the noise comes back. I worked on this for hours trying various things with no luck. Here are some things I tried and the results.
1. re-did all the grounds on everything. No change.
2. disconnected turn coordinator. Noise gone with or without the landing light on.
3. disconnect comm antenna at radio pigtail. Noise is gone.
4. hooked up rubber ducky antenna totally isolated from plane and the noise comes back.
5. hooked up turn coordinator directly to the battery (this fixed the strobe noise problem) totally isolating it from the bus power supply. Noise is the same.
In every instance though, I can turn on the landing light and the noise goes away. I don't get it?
It seems like it is coming in through the antenna but why would turning the landing light on make it go away. Anyone have any ideas? Filter maybe?
Plane is a Kitfox with 912 ul.
Icom radio IC A-200
Flightcom intercom
DM antenna
Lightspeed QFR headset
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