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Strobe Grounding

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mike(at)vision499.com
Guest

Posted: Thu Sep 29, 2016 7:51 pm Post subject: Strobe Grounding

I have installed a Whelen HDACF Power Supply in my composite aircraft 

and the instructions make no mention of grounding the shield in the 

cables to the strobes.



Should I ground the shield and if yes should it be one or both ends.



Thanks



Mike

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art(at)zemon.name
Guest

Posted: Fri Sep 30, 2016 4:01 am Post subject: Strobe Grounding

Mike,



The instructions for the AeroLEDS Pulsar show the shield connected to local ground at both ends.

    -- Art Z.



On Thu, Sep 29, 2016 at 10:48 PM,  <mike(at)vision499.com (mike(at)vision499.com)> wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: mike(at)vision499.com (mike(at)vision499.com)

 

 

 

 I have installed a Whelen HDACF Power Supply in my composite aircraft and the instructions make no mention of grounding the shield in the cables to the strobes.

 

 Should I ground the shield and if yes should it be one or both ends.

 

 Thanks

 

 Mike 	


-- 

https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel

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whd721

Joined: 01 Oct 2007
Posts: 15

Posted: Fri Sep 30, 2016 6:44 am Post subject: Strobe Grounding

This should be the subject of a discussion hopefully with input from Aeroleds.  

 I installed Aeroleds Pulsars.  I had major loud static noise during  the first flights.  

  

 In phone discussions with Aeroleds, I was instructed to disconnect the outboard shield grounds and insulate that end shield from any structure near the Aeroleds light.  This greatly reduced my static noise. 

  

 I still have a low level Aeroleds strobe sound ( But not at a level objectionable to me), but, I still have a significant static noise ( primarily on the ground during taxiing) but still occasionally in the air.  This winter I intend to try and  trace all the Aeroleds wiring and find an intermittent ground location or connection

  

  

 The Aeroleds schematic shows grounding the shield at both ends ( in my interpretation).  I can only offer, be very careful in the Aeroleds wiring and grounding.  You will not enjoy Aeroleds static noise!

  

 I would suggest Aeroleds should provide some additional guidance for their product as the installation schematic is not clear.

  

 I do like the Aeroleds products and hope this gets some clarification.

  

    	  Quote: 	
		   On Sep 30, 2016, at 4:54 AM, Art Zemon <art(at)zemon.name (art(at)zemon.name)> wrote:

   Mike,  

 The instructions for the AeroLEDS Pulsar show the shield connected to local ground at both ends.

  

     -- Art Z.  On Thu, Sep 29, 2016 at 10:48 PM,  <mike(at)vision499.com (mike(at)vision499.com)> wrote:  	  Quote: 	
		   --> AeroElectric-List message posted by:  mike(at)vision499.com (mike(at)vision499.com)    I have installed a Whelen HDACF Power Supply in my composite aircraft and the instructions make no mention of grounding the shield in the cables to the strobes.  Should I ground the shield and if yes should it be one or both ends.  Thanks  Mike 	
 

  

 --     https://CheerfulCurmudgeon.com/  "If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel

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_________________
whd721
RV9A
Beaverton, OR

edpav8r(at)yahoo.com
Guest

Posted: Fri Sep 30, 2016 8:40 am Post subject: Strobe Grounding

Mike,



See "Interconnecting Cable" and Fig 3, on page 2 of this document:



     http://www.whelen.com/install/136/13603.pdf



Eric

 	  Quote: 	
		   On Sep 29, 2016, at 8:48 PM, mike(at)vision499.com wrote:

 I have installed a Whelen HDACF Power Supply in my composite aircraft and the instructions make no mention of grounding the shield in the cables to the strobes.

 

 Should I ground the shield and if yes should it be one or both ends.

 

 Thanks

 

 Mike

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Sep 30, 2016 10:14 am Post subject: Strobe Grounding

 	  Quote: 	
		   

 I installed Aeroleds Pulsars.  I had major loud static noise during  the first flights.  	


   The word 'static' conjures up a mental

   picture of radio noise on an AM radio

   tuned off-station with thunder storms

   in the area. Or perhaps the noise heard

   near a high voltage transmission line where

   one or more insulators are failing. "Static"

   normally describes random, short duration

   impulses . . . no regularity reminiscent

   of a tone or musical note.



   Can you be a bit more descriptive? Also,

   did you conduct any investigative

   operations to determine whether the noise

   was coming in through antenna, power supply

   or system signal leads (See chapter 16

   in the 'Connection'.



 

  	  Quote: 	
		  In phone discussions with Aeroleds, I was instructed to disconnect the outboard shield grounds and insulate that end shield from any structure near the Aeroleds light.  This greatly reduced my static noise. 	


   This is a disturbing revelation. The AEROLED

   website speaks to STC and TSO qualification

   of products. These assertions argue with any

   narrative suggesting that treatment of shields

   had a profound effect on an objectionable

   emission of noise.



  	  Quote: 	
		  I still have a low level Aeroleds strobe sound ( But not at a level objectionable to me), but, I still have a significant static noise ( primarily on the ground during taxiing) but still occasionally in the air.  This winter I intend to try and trace all the Aeroleds wiring and find an intermittent ground location or connection 	


   Please go through the diagnostic exercises

   described in the 'Connection. Also, it would

   be VERY helpful if you could post a .wav or

   .mp3 recording of the sounds you hear.



   The qualification processes for dozens of

   products and systems I've shepherded through

   DO-160/MIL-STD-461 qualification would not

   have allowed a program to move forward with

   EMC deficiencies that you've described.



  	  Quote: 	
		  The Aeroleds schematic shows grounding the shield at both ends ( in my interpretation).  I can only offer, be very careful in the Aeroleds wiring and grounding.  You will not enjoy Aeroleds static noise!



 I would suggest Aeroleds should provide some additional guidance for their product as the installation schematic is not clear.



 I do like the Aeroleds products and hope this gets some clarification. 	


   Precisely. Shielding of wires is intended

   to break ELECTROSTATIC coupling between a

   potentially antagonistic signal (high voltage,

   fast rise) and a potential victim wire

   carrying low level data. The de-coupling process

   is guaranteed only to ward off exchange of

   unfriendly energy between conductors in

   adjacent wire bundles.



   Any time the existence or treatment of shields

   has an effect on RADIATED noise (stuff that

   comes in through the antennas), there is a

   SERIOUS problem with that product's design

   and qualification. I think it unlikely that

   you have any small-signal data or audio lines

   bundled with shielded wires in the strobe system;

   hence this thread suggests value in a more

   detailed investigation.



 



 

   Bob . . .

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