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Avoiding strobe noise?

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a.s.elliott(at)cox.net
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Posted: Thu May 15, 2008 6:20 am Post subject: Avoiding strobe noise?

I am building a 601XL (all aluminum), and have located the COMM antenna on  the bottom of the fuselage between the seats.  (It's a taildragger, so this  is behind the gear.)  I have the primary battery under the right seat and  am holding off locating the second battery until I see how the W&B turns  out.

  

 It has turned out to be convenient, wiring-wise, to locate the strobe  power supply, an XPAK-604X-HR, under the left seat.  In this location, the  coax to the COMM antenna and at least one of the wires to the strobe heads will  end up in close proximity.

  

 My question is:  Assuming the coax is properly terminated and the  strobe cables' shields are properly grounded at one end, is there going to  be a problem with strobe noise interfering with communications?  (The  strobe cables have a foil shield with a drain wire. The drain wire is grounded  to the wing structure at the tip.)

  

 If a problem is likely, are there any additional precautions I could take  to avoid one?

  

 Thanks,

 Andy Elliott, Mesa, AZ

N601GE (reserved)

601XL/TD, Corvair,  building...

   [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Thu May 15, 2008 11:40 am Post subject: Avoiding strobe noise?

At 07:16 AM 5/15/2008 -0700, you wrote:



 	  Quote: 	
		  I am building a 601XL (all aluminum), and have located the COMM antenna on 

the bottom of the fuselage between the seats.  (It's a taildragger, so 

this is behind the gear.)  I have the primary battery under the right seat 

and am holding off locating the second battery until I see how the W&B 

turns out.



It has turned out to be convenient, wiring-wise, to locate the strobe 

power supply, an XPAK-604X-HR, under the left seat.  In this location, the 

coax to the COMM antenna and at least one of the wires to the strobe heads 

will end up in close proximity.



My question is:  Assuming the coax is properly terminated and the strobe 

cables' shields are properly grounded at one end, is there going to be a 

problem with strobe noise interfering with communications?  (The strobe 

cables have a foil shield with a drain wire. The drain wire is grounded to 

the wing structure at the tip.)



If a problem is likely, are there any additional precautions I could take 

to avoid one?




	


   Every time someone reports a "noise problem cured

   by repositioning wiring" it was a demonstration of

   some OTHER root cause.



   When products are qualified to be used on airplanes,

   they are qualified to both control emissions and

   withstand certain stresses that are known to exist

   in the aircraft environment.



   The wiring you've cited are not particularly

   communicative with respect to noise . . . assuming

   that the installation of said wires is in accordance

   with manufacturer's instructions.



   In the heavy iron birds, we are seldom blessed with

   enough room to run all the wires that are necessary

   for operation much less comb them into potentially

   antagonistic and/or victim systems.



   The short answer is run them neatly together and

   you'll be fine.



   Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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hammer408(at)comcast.net
Guest

Posted: Fri May 16, 2008 1:37 pm Post subject: Avoiding strobe noise?

So Bob:



as long as all wires are installed and grounded per maunfacture's spec,

running (stringing) wires like Strobe Power Supply, Nav/Com, Transponder,

Flaps, Pitot Heat together along the bottom of a fuselage and thru bulkheads

together are OK ?



Hank



---

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nuckolls.bob(at)cox.net
Guest

Posted: Fri May 16, 2008 6:31 pm Post subject: Avoiding strobe noise?

At 05:40 PM 5/16/2008 -0700, you wrote:



 	  Quote: 	
		  

<hammer408(at)comcast.net>



So Bob:



as long as all wires are installed and grounded per maunfacture's spec,

running (stringing) wires like Strobe Power Supply, Nav/Com, Transponder,

Flaps, Pitot Heat together along the bottom of a fuselage and thru bulkheads

together are OK ?


	


   yup . . /



   Bob . . .

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hammer408(at)comcast.net
Guest

Posted: Sun May 18, 2008 6:49 am Post subject: Avoiding strobe noise?

Thanks.....

---

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