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Ground plane on Carbon part 2

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dballin(at)gmail.com
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Posted: Sat Sep 29, 2007 9:00 am Post subject: Ground plane on Carbon part 2

Thanks for all the advice on the ground plane for a carbon aircraft.

I decided to use copper foil tape in radials on the inside.  The tape

has adhesive, but I covered it with a layer of fiberglass.  I put an

oval of copper at the center using the conductive adhesive to connect

the radials to the oval.  My plan was to solder them together, but am

worried about the heat and damaging the carbon.  I plan to use nut

plates through the copper to mount the antenna, but how can I get good

conductivity to the antenna base.  I was thinking about using a

separate ground screw as per one of Bob's diagrams, but the antenna

has a BNC connector and there really isn't any way to connect a ground

that I can think of.



Any thoughts?



Thanks

Dan Ballin

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nuckolls.bob(at)cox.net
Guest

Posted: Sat Sep 29, 2007 11:48 am Post subject: Ground plane on Carbon part 2

At 07:56 AM 9/29/2007 -0700, you wrote:



 	  Quote: 	
		  



Thanks for all the advice on the ground plane for a carbon aircraft.

I decided to use copper foil tape in radials on the inside.  The tape

has adhesive, but I covered it with a layer of fiberglass.  I put an

oval of copper at the center using the conductive adhesive to connect

the radials to the oval.  My plan was to solder them together, but am

worried about the heat and damaging the carbon.


	


   Use 63/37 solder and please do solder them.



 	  Quote: 	
		    I plan to use nut

plates through the copper to mount the antenna, but how can I get good

conductivity to the antenna base.  I was thinking about using a

separate ground screw as per one of Bob's diagrams, but the antenna

has a BNC connector and there really isn't any way to connect a ground

that I can think of.



Any thoughts?


	




   See:



http://www.aeroelectric.com/Pictures/Antenna/Antenna_Installation.gif



   the mounting screws get you the ground. You'll end up

   with 3 or 4 total. Obviously, with the composite aircraft

   you won't have to clean the interior surfaces market with

   (*) but certainly under the bolt heads and nuts. Recommend

   you do not use nutplates. The hardware shown provides the

   minimum-parts, short-path connection between antenna based

   and "doubler" which in this case is your radial ground-plate.



   Bob . . .

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