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Alternator Noise

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larryflo(at)prodigy.net
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Posted: Sun Sep 13, 2009 5:10 pm Post subject: Alternator Noise

I have built a SeaRey witha Rotax 912.  It has an internal alternator.  I have a tremendous amount of noise in the headset.  I have isolated the problem to the regulator or alternator.  The Radio Shack filters are no longer available.   Any suggestions?  Ameriking? [quote][b]

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nuckollsr

Joined: 24 Mar 2009
Posts: 95
Location: Medicine Lodge, KS

Posted: Mon Sep 14, 2009 4:38 am Post subject: Re: Alternator Noise

Keep in mind that perhaps thousands of similar alternator/regulator systems are flying where the builders have reported no problems with noise in their electronics. This strongly suggests that the optimum solution to your problem is to deduce the difference between how your components are installed and wired as compared to other systems flying.



Can you describe the your radio/audio system and how you configured the ground system for your electrical and avionics?



One of the reasons that filters are becoming difficult to find is because folks who design and manufacture accessories have learned how to make them perform well (tolerate normal and expected noise levels) in vehicular DC power systems. The optimum solution for your problem may well be a change to configuration as opposed to adding the cost, weight and complexity of a filter (which may not fix the problem).



Bob . . .

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larryflo(at)prodigy.net
Guest

Posted: Mon Sep 14, 2009 6:47 am Post subject: Alternator Noise

Bob,

My SeaRey is so tightly wired tha to troubleshoot woul be a massive event ( i.e. Remove wings, lift engine, drain cooling, etc). 

I have a Microaire transceiver and transponder, a PS Engineering intercom. I explicitly followed the wiring instruction. The com antenna is mounted on top forward of the engine.



Even the panel is an ordeal to deal with.  I guess I am looking for a way around my inadequacies.

On Sep 14, 2009, at 8:38 AM, "nuckollsr" <bob.nuckolls(at)aeroelectric.com> wrote:






Keep in mind that perhaps thousands of similar alternator/regulator systems are flying where the builders have reported no problems with noise in their electronics. This strongly suggests that the optimum solution to your problem is to deduce the difference between how your components are installed and wired as compared to other systems flying.



Can you describe the your radio/audio system and how you configured the ground system for your electrical and avionics?



One of the reasons that filters are becoming difficult to find is because folks who design and manufacture accessories have learned how to make them perform well (tolerate normal and expected noise levels) in vehicular DC power systems. The optimum solution for your problem may well be a change to configuration as opposed to adding the cost, weight and complexity of a filter (which may not fix the problem).



Bob . . .





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 62911#262911

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jay(at)horriblehyde.com
Guest

Posted: Mon Sep 14, 2009 7:25 am Post subject: Alternator Noise

Do you have a large capacitor between the outgoing positive of the regulator

and ground, as suggested on Z-16?



Jay



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larryflo(at)prodigy.net
Guest

Posted: Mon Sep 14, 2009 11:14 am Post subject: Alternator Noise

Yes



Sent from my iPhone



On Sep 14, 2009, at 11:23 AM, "Jay Hyde" <jay(at)horriblehyde.com> wrote:






Do you have a large capacitor between the outgoing positive of the regulator

and ground, as suggested on Z-16?



Jay



--

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larryflo(at)prodigy.net
Guest

Posted: Mon Sep 14, 2009 11:14 am Post subject: Alternator Noise

Yep.



Sent from my iPhone



On Sep 14, 2009, at 11:23 AM, "Jay Hyde" <jay(at)horriblehyde.com> wrote:






Do you have a large capacitor between the outgoing positive of the regulator

and ground, as suggested on Z-16?



Jay



--

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