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Strobe noise

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luckymacy(at)comcast.net
Guest

Posted: Wed Apr 19, 2006 3:27 am Post subject: Strobe noise

The archives show strobe noise isn't unique and I have some too.  It's pretty low level and sometimes even seems to go away in my front seat headsets when I have my intercom turned off (but not always).  However, when the intercom is turned on the strobe sound is amplified to the point where I won't take a passenger.  Oly the strobe noise causes such a problem.  Everything seems to fine with the strobes off.



So the rear seat headset jacks/wire are bringing the noise into the radio which is made worse when the intercom is powered on or the strobes needed to be grounded differently to begin with, or both, or something else!

I have an RV8, the battery is in the back and grounded on a nearby longeron.  The two strobe power supplies are at the wing tips and grounded locally.  I could extend the strobe grounds to  bring it all the way back into the fuse but then left with multiple choices on where to ground as I am using Van's electrical system "kit".

Ground the strobes to the battery, to the comm radio post, put in RF caps and leave the rest alone, and how to troubleshoot for root cause the Rear Seat jacks which might actually be the problem?  Any ideas?  It's tough to work on the plane when the weather is so NICE for flying!



The archives show strobe noise isn't unique and I have some too. It's pretty low level and sometimes even seems to go away in my front seat headsets when I have my intercom turned off (but not always). However, when the intercom is turned on the strobe sound is amplified to the point where I won't take a passenger. Oly the strobe noise causes such a problem. Everything seems to fine with the strobes off.



So the rear seat headset jacks/wire are bringing the noise into the radio which is made worse when the intercom is powered on or the strobes needed to be grounded differently to begin with, or both, or something else!





I have an RV8, the battery is in the back and grounded on a nearby longeron. The two strobe power supplies are at the wing tips and grounded locally. I could extend the strobe grounds to bring it all the way back into the fuse but then left with multiple choices on where to ground as I am using Van's electrical system "kit".





Ground the strobes to the battery, to the comm radio post, put in RF caps and leave the rest alone, and how to troubleshoot for root cause the Rear Seat jacks which might actually be the problem? Any ideas? It's tough to work on the plane when the weather is so NICE for flying!

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rv8ch

Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

Posted: Wed Apr 19, 2006 4:05 am Post subject: Strobe noise

 	  Quote: 	
		   So the rear seat headset jacks/wire are bringing the noise into the

 radio which is made worse when the intercom is powered on or the

 strobes needed to be grounded differently to begin with, or both, or

 something else! 


	


Lucky,  Are your headset jacks isolated from the airframe?  Does

the noise match the flashing of the strobes, or is is more

continuous?



-- 

Mickey Coggins

http://www.rv8.ch/

#82007 finishing

do not archive

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_________________
Mickey Coggins
http://www.rv8.ch/

luckymacy(at)comcast.net
Guest

Posted: Wed Apr 19, 2006 6:06 am Post subject: Strobe noise

Noise matches the strobes.



I didn't think to relook at the passenger jacks but doesn't one or both have an insulating washer that's installed in order to work at all and if they were installed wrong wouldn't I also be getting every electrical pulse generated in the plane like the alternator too?



This issue is only a problem when the strobes are turned on.



I was afraid to write this up without first relooking over all the drawings and such but I keep convincing myself when I'm actually in the plane that it's most likely just a strobe power supply grounding issue.



-------------- Original message -------------- 

From: Mickey Coggins <mick-matronics(at)rv8.ch> 



 	  Quote: 	
		   

 

 > So the rear seat headset jacks/wire are bringing the noise into the 

 > radio which is made worse when the intercom is powered on or the 

 > strobes needed to be grounded differently to begin with, or both, or 

 > something else! 

 

 Lucky, Are your headset jacks isolated from the airframe? Does 

 the noise match the flashing of the strobes, or is is more 

 continuous? 

 

 -- 

 Mickey Coggins 

 http://www.rv8.ch/ 

 #82007 finishing 

 

 

 do not archive 

 

 

 

 

 

 

 

 

 

 

 

 


	




Noise matches the strobes.



I didn't think to relook at the passenger jacks but doesn't one or both have an insulating washer that's installed in order to work at all and if they were installed wrong wouldn't I also be getting every electrical pulse generated in the plane like the alternator too?



This issue is only a problem when the strobes are turned on.



I was afraid to write this up without first relooking over all the drawings and such but I keep convincing myself when I'm actually in the plane that it's most likely just a strobe power supply grounding issue.



-------------- Original message -------------- 

From: Mickey Coggins mick-matronics(at)rv8.ch 



 -- AeroElectric-List message posted by: Mickey Coggins <MICK-MATRONICS(at)RV8.CH>

 

  So the rear seat headset jacks/wire are bringing the noise into the 

  radio which is made worse when the intercom is powered on or the 

  strobes needed to be grounded differently to begin with, or both, or 

  something else! 

 

 Lucky, Are your headset jacks isolated from the airframe? Does 

 the noise match the flashing of the strobes, or is is more 

 continuous? 

 

 -- 

 Mickey Coggins 

 http://www.rv8.ch/ 

 #82007 finishing 

 

 

 do not archive 

 

 

 

 _-  - The

 AeroElectric-List Email Forum - 

 

 

 

 

 

 

 

&g

t;

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