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power wires to strobe power supply

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sarg314(at)comcast.net
Guest

Posted: Sat Jun 30, 2007 8:18 pm Post subject: power wires to strobe power supply

I was about to run a couple #16 wires to my Whelen HDACF strobe power 

supply when I noticed that the installation instructions say that 

"shielded wire is generally not necessary but has proven effective in 

reducing the possibility of radio interference."



Sounds like their lawyers wrote it. The HV wires to the strobes are of 

course shielded, but do the +12v and GND wires to the supply have to be 

shielded too?



--

Tom S.

RV-6A, electrical system

wgill10(at)comcast.net
Guest

Posted: Sat Jun 30, 2007 9:02 pm Post subject: power wires to strobe power supply

Tom,



I did just as you have suggested and have no problems not using shielded

wires TO the strobe power supply.



Bill



 

--

nuckollsr(at)cox.net
Guest

Posted: Mon Jul 02, 2007 1:36 pm Post subject: power wires to strobe power supply

At 09:16 PM 6/30/2007 -0700, you wrote:



 	  Quote: 	
		  



I was about to run a couple #16 wires to my Whelen HDACF strobe power 

supply when I noticed that the installation instructions say that 

"shielded wire is generally not necessary but has proven effective in 

reducing the possibility of radio interference."



Sounds like their lawyers wrote it. The HV wires to the strobes are of 

course shielded, but do the +12v and GND wires to the supply have to be 

shielded too?


	


   Shielding has a very limited effectiveness against

   only the rarest of noise propagation modes. If the

   device being powered up has passed DO-160 conducted

   emissions, then there's no value in having the power

   wires to that device be shielded. In fact, ANY device

   that's shown to benefit from shielding of power leads

   either as a potential antagonist or victim needs to

   go back to the drawing boards . . . and probably

   wouldn't pass DO-160 Conducted Emissions anyhow.

   Don't worry about shielding these power leads.



   Bob . . .

MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Thu Sep 30, 2010 9:31 am Post subject: Re: power wires to strobe power supply

I'm using aeroflash strobes, with non shielded wire.  I'm gettng the whoop whop whine sound.  I've kept the wires away from the antanna as best as possible.  I've attached as close to the  positve side of the terminal as possible and still the sound.  It comes through with the intercom on or off.  The aeroflash power supply comes with a ground lead, this is the only area that I have not used a return all the way to the ground and I regret it now, and they are at my wing tips.  Should I have gone directly to the ground tabs with an actual wire, would this make a difference in the sound.

_________________
Zodiac 601 HD
Jabiru 3300
Wood Sensinich 64x47
Finally Flying

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Sep 30, 2010 3:32 pm Post subject: power wires to strobe power supply

At 12:31 PM 9/30/2010, you wrote:

 	  Quote: 	
		  

<michaelherder(at)beckgroup.com>



I'm using aeroflash strobes, with non shielded wire.  I'm gettng the 

whoop whop whine sound.  I've kept the wires away from the antanna 

as best as possible.  I've attached as close to the  positve side of 

the terminal as possible and still the sound.  It comes through with 

the intercom on or off.  The aeroflash power supply comes with a 

ground lead, this is the only area that I have not used a return all 

the way to the ground and I regret it now, and they are at my wing 

tips.  Should I have gone directly to the ground tabs with an actual 

wire, would this make a difference in the sound.


	


    It takes TWO connections to LOOP. The fact that you

    hear the noise with the intercom OFF sugests that your

    headset jacks are not insulated from airframe ground.



    Have you installed insulating washers on your headset

    and microphone jacks?

   Bob . . .

MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Thu Sep 30, 2010 8:11 pm Post subject: Re: power wires to strobe power supply

I've only insulated my mic jacks.  I guess I'll insulationg my headph one jacks too.  Let me clarify this....  I hear the noise with the intercom on or off.  When the intercom is off it is bypassing the intercom in failsafe mode.



Flightcom 403 w/ stereo, Garmin SL 30 radio, Aeroflash strobes

_________________
Zodiac 601 HD
Jabiru 3300
Wood Sensinich 64x47
Finally Flying

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 02, 2010 9:03 am Post subject: power wires to strobe power supply

At 11:11 PM 9/30/2010, you wrote:

 	  Quote: 	
		  

<michaelherder(at)beckgroup.com>



I've only insulated my mic jacks.  I guess I'll insulationg my 

headph one jacks too.  Let me clarify this....  I hear the noise 

with the intercom on or off.  When the intercom is off it is 

bypassing the intercom in failsafe mode.


	


   The SIGNAL wires are switch between normal and fail-safe

   configurations, not the ground wires. It's the ground wires

   of the headset that are probably sharing current pathways

   with ground wires of the strobes that generate "the loop".



   Bob . . .

MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Sat Oct 02, 2010 10:18 am Post subject: Re: power wires to strobe power supply

Went to the hangar today and tried with the mic and headphone jacks off of the panel ( in my hand to make sure they were isolated) .  No luck, but a great thought.... NEXT?  THis is getting to be a bummer.

_________________
Zodiac 601 HD
Jabiru 3300
Wood Sensinich 64x47
Finally Flying

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 02, 2010 11:33 am Post subject: power wires to strobe power supply

At 01:18 PM 10/2/2010, you wrote:

 	  Quote: 	
		  

<michaelherder(at)beckgroup.com>



Went to the hangar today and tried with the mic and headphone jacks 

off of the panel ( in my hand to make sure they were isolated) .  No 

luck, but a great thought.... NEXT?  THis is getting to be a bummer.


	


   Then the 'loop' is somewhere else. Since the interference

   is detected with the intercom OFF suggests that the problem

   does not lie upstream of the intercom but downstream. Do all

   your panel mounted electro-whizzies enjoy a common ground?

        Bob . . .

                    ////

                   (o o)

    ===========o00o=(_)=o00o=========

    < Go ahead, make my day . . .   >

    < show me where I'm wrong.      >

    =================================

MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Sun Oct 03, 2010 9:50 am Post subject: Re: power wires to strobe power supply

I FOUND IT.  Strobe power supply wires to close and parallel with com and radio wires.   What type of interference is that considered?  And does shielding help it?

_________________
Zodiac 601 HD
Jabiru 3300
Wood Sensinich 64x47
Finally Flying

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 03, 2010 12:26 pm Post subject: power wires to strobe power supply

At 12:50 PM 10/3/2010, you wrote:


<michaelherder(at)beckgroup.com>



I FOUND IT.  Strobe power supply wires to close and parallel with com 

and radio wires.   What type of interference is that considered?



    Electro-magnetic coupling. See narrative on my first

    mini-van purchase at OSH way back when. Pages 16-10 to

    16-12 of the 'Connection.

   And does shielding help it?



    No.



    This coupling mode can be broken by any one

    of three ways:



    Preservation of the "parallel conductors

    configuration for inbound-outbound electrons

    in either (1) the antagonist's power lines

    or (2) the victim's signal lines or (3) increased

    spacing between the two pathways as described

    in the narrative on my mini-van and demonstrated

    again by your experience cited above.



    Good detective work!



    Bob . . .

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