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Date: Tue, 14 Feb 2006 10:14:50 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Radio noise
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Bulent Aliev wrote:

> 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?


The fact that you have multiple antagonist leads me to believe that you 
might not have a common ground for your radios.  90% of radio noise 
problems are eliminated by simply bringing all avionics grounds to a 
single point.

-- 
         ,|"|"|,               Ernest Christley     |
----===<{{(oQo)}}>===----     Dyke Delta Builder    |
        o|  d  |o          www.ernest.isa-geek.org  |