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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Radio noise
Date: Tue, 14 Feb 2006 21:15:33 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


On Feb 14, 2006, at 10:14 AM, Ernest Christley wrote:

> 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     |

Well, I just came from the hangar, 9PM and have not made any  
progress. Tried everything suggested. Disconnected the radio/AP  
grounds and run them directly to the battery - same problem
Opened the AP and extra grounded the unit - Nada
Everything that can make noise is making it?
Capacitors as suggested by Chad, did not make any difference.
I'll have to sleep on it. Too tired and frustrated.
Buly