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LED lights intercom interference - Ferrite needed?

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william(at)wbliss.co.uk
Guest

Posted: Sun Oct 28, 2018 1:51 pm Post subject: LED lights intercom interference - Ferrite needed?

Hi all



I have installed bright LED's into the cowling for improved visual 

conspicuity. When the engine is not running I now have audible 

breakthrough white noise through the headsets in time with the Skyflash 

strobe light (which is mounted on the tail). I have had no problems with 

the strobe system up until now. While flying the white noise was 

continuous but I was able to partially stop it by altering the intercom 

squelch. I then found I had no interference on one frequency but still 

had lots on another frequency. Radio communications do not seem to be 

affected.  The LED and Strobe circuits run off separate contact breaker 

switches. Radio and Transponder are Trig which work ok up to now.



There is no high frequency noise suppresion in the LED wiring. I will 

try running the power cable through a ferrite ring close to the LED 

unit. Any suggestions?



William Bliss G-WUFF Mono

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Burrilla

Joined: 25 Apr 2015
Posts: 182

Posted: Mon Oct 29, 2018 12:30 am Post subject: LED lights intercom interference - Ferrite needed?

Sounds like you’ve disturbed something in installing the new wiring.



First thing I would check is that everything is earthed to a common Earth Bus and that all the connections are tight.



How are you powering the new LED? some converters that drop the 12V to LED voltages, 1.2 - 1.4 volt, produce noise from a switching circuit. does the noise stop if you pull the LED breaker?



Alan



 	  Quote: 	
		   On 28 Oct 2018, at 21:43, William Bliss <william(at)wbliss.co.uk> wrote:

 

 

 

 Hi all

 

 I have installed bright LED's into the cowling for improved visual conspicuity. When the engine is not running I now have audible breakthrough white noise through the headsets in time with the Skyflash strobe light (which is mounted on the tail). I have had no problems with the strobe system up until now. While flying the white noise was continuous but I was able to partially stop it by altering the intercom squelch. I then found I had no interference on one frequency but still had lots on another frequency. Radio communications do not seem to be affected.  The LED and Strobe circuits run off separate contact breaker switches. Radio and Transponder are Trig which work ok up to now.

 

 There is no high frequency noise suppresion in the LED wiring. I will try running the power cable through a ferrite ring close to the LED unit. Any suggestions?

 

 William Bliss G-WUFF Mono

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r.vogel(at)ggs.ch
Guest

Posted: Mon Oct 29, 2018 2:21 pm Post subject: LED lights intercom interference - Ferrite needed?

Hi William



I have the same problem caused by the switching voltage regulator inside 

the LED spot

light in the cowling. One ferrite core was not enough to fix this problem.

I will test an EMI Suppression Filter, close to the LED, as next step 

and will inform you about the result.



Ruedi Vogel

Am 28.10.2018 um 22:43 schrieb William Bliss:

 	  Quote: 	
		   



 Hi all



 I have installed bright LED's into the cowling for improved visual 

 conspicuity. When the engine is not running I now have audible 

 breakthrough white noise through the headsets in time with the 

 Skyflash strobe light (which is mounted on the tail). I have had no 

 problems with the strobe system up until now. While flying the white 

 noise was continuous but I was able to partially stop it by altering 

 the intercom squelch. I then found I had no interference on one 

 frequency but still had lots on another frequency. Radio 

 communications do not seem to be affected.  The LED and Strobe 

 circuits run off separate contact breaker switches. Radio and 

 Transponder are Trig which work ok up to now.



 There is no high frequency noise suppresion in the LED wiring. I will 

 try running the power cable through a ferrite ring close to the LED 

 unit. Any suggestions?



 William Bliss G-WUFF Mono




	


-- 

Ruedi Vogel, 3380 Wangen a.A.

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