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Can radials of home made ground plane be tapered?

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nuckolls.bob(at)aeroelect
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Posted: Sun Sep 27, 2020 11:06 am Post subject: Can radials of home made ground plane be tapered?

At 07:34 AM 9/27/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com>



 Hi Group I have a home made ground plane made out of aluminium for a Garmin GA-35 GPS / WAAS antenna. It has 8 radials 1" wide and ~7.75" long. I'm using the ground plane to support the antenna. It will be living under the ceiling of the baggage bay in a Europa. After cutting out the ground plane I find that it's plenty strong enough to support the antenna. Is it OK to taper the radials from 1" at the root to 1/2" at the tip? I could shave off some weight from the existing 8oz. Ron P. 	


    Where did you find recommendations/requirements for

    a 'ground plane' on this antenna. I've looked at

    some garmin docs and only find references to

    antenna/coax grounding to skin . . . no requirements

    for any 'tuned' or 'resonant' ground plane in

    a plastic airplane.



 

   Bob . . .

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Sun Sep 27, 2020 12:41 pm Post subject: Re: Can radials of home made ground plane be tapered?

Hi Bob



See page 2-5 of GA-35 antenna installation manual: https://static.garmin.com/pumac/190-00848-00_f.pdf See page 6-8 of GDL-82 installation manual: https://static.garmin.com/pumac/190-01810-00_06.pdf



Ron P.

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