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Radio Noise

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larryflo(at)prodigy.net
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Posted: Sun Sep 13, 2009 4:55 pm Post subject: Radio Noise

I have a bunch of noise in my headset, which is not ambient noise.  I have isolated it to the regulator and/or alternator.  I built a SeaRey with a 912 UL Rotax engine which has an intenral alternator.  I would have preferred to use one of the Radio Shack filters but they are off the market.  Is there a good substitute?  Ameriking? [quote][b]

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sun Sep 13, 2009 11:21 pm Post subject: Re: Radio Noise

Have you fitted the large (approx. 25,000 uF) capacitor to the regulator DC output?  This is covered in some of the Rotax info and installation manuals for some of the homebuilt market radios. best to use a 105 degree C rated capacitor and not in the cabin area.

Ralph

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_________________
Ralph - CH701 / 2200a

larryflo(at)prodigy.net
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Posted: Mon Sep 14, 2009 3:16 am Post subject: Radio Noise

Yes, There is a 22,000 installed.



Sent from my iPhone



On Sep 14, 2009, at 3:21 AM, "jetboy" <sanson.r(at)xtra.co.nz> wrote:






Have you fitted the large (approx. 25,000 uF) capacitor to the regulator DC output?  This is covered in some of the Rotax info and installation manuals for some of the homebuilt market radios. best to use a 105 degree C rated capacitor and not in the cabin area.

Ralph



--------

Ralph - CH701 / 2200a





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douglist(at)macnauchtan.c
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Posted: Mon Sep 14, 2009 9:15 am Post subject: Radio Noise

At 04:13 -0700 9/14/09, Larry Florman wrote:

 	  Quote: 	
		  

Yes, There is a 22,000 installed.



On Sep 14, 2009, at 3:21 AM, "jetboy" <sanson.r(at)xtra.co.nz> wrote:


Have you fitted the large (approx. 25,000 uF) capacitor to the regulator DC output?


	


If the noise can be described as a whine you may have a bad diode in the alternator. I donno about the Rotax but perhaps it has diodes mounted externally?



One test is to see if the pitch of the whine changes  with engine speed. Another is an oscilloscope connected to the power bus.



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