I had the same problem on my AVID when I started flying it. The only thing I could get some improvement was to add a high quality capacitor on the alternator. The best I found was the one Aircraft Spruce is selling. My alternator is running with internal regulator. If you are running an external regulator, you may need filtering on these lines too. Keep in mind, the effectiveness of filtering this kind of noise depends on having the filter as close to the source of the noise as possible.
For this same reason, every motor will have to be filtered separate.

Richard Sohn
N-2071U



----- Original Message ----- From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 13, 2006 5:59 PM
Subject: [FlyRotary] Radio noise

Here is a problem for you large brained engineers:
My radio is picking up noise from all the electrical motors including  the alternator. I took the alternator to the shop and checked "as  new". When I disconnect the coax from the radio, the noises stop,  which leads me to believe the antenna coax is picking up the  interference somehow. Guy at the airport suggested a clamp-on ferrite  filter on the coax. I bought one tonight, but did not have time to  test it.
The offenders are: fuel pumps, nose gear motor and alternator.
Any Ideas?


Buly
CZ MK-IV

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