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BNC Shells touching

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rvg8tor

Joined: 06 Apr 2009
Posts: 50
Location: Olympia, WA

Posted: Thu Mar 08, 2012 12:58 pm Post subject: BNC Shells touching

My GNS-430W is a tight fit and the connections for the 4 antenna cables are very close to each other.  One of them is close to a cross cabin brace and the outside of the BNC can touch this metal brace.



Is this a big deal, should I wrap the outsides of all the BNC connectors so that they can't make metal to metal contact or does it matter.



Cheers

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_________________
Mike "Nemo" Elliott
RV-8A QB (Engine)
www.mykitlog.com/rvg8tor

nuckolls.bob(at)aeroelect
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Posted: Thu Mar 08, 2012 3:00 pm Post subject: BNC Shells touching

At 02:58 PM 3/8/2012, you wrote:

 	  Quote: 	
		  



My GNS-430W is a tight fit and the connections for the 4 antenna 

cables are very close to each other.  One of them is close to a 

cross cabin brace and the outside of the BNC can touch this metal brace.



Is this a big deal, should I wrap the outsides of all the BNC 

connectors so that they can't make metal to metal contact or does it matter.


	


   Making contact isn't a big deal electrically but having

   things bang together or rub mechanically can wear things

   where they were not intended to wear.



   Certainly some sort of buffer between otherwise touching

   parts is a good idea. We wouldn't be allowed such liberties

   in a TC airplane. As much as we'd like to think that

   the machine is a rigid body, there are in-flight stresses

   that can cause clearances to change under certain

   conditions. I recall reading a spec at Beech on minimum

   clearances both for access and separation.



   But anything you stick in the gap might be the occasion

   for considerable force to bear against the connectors

   if that gap were to close for any reason.



   In the best of all worlds, you'd strive for a half inch

   or so of clearance.

   Bob . . .

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