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VHF Antenna in tail

 
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coatbeam(at)melbpc.org.au
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PostPosted: Thu Dec 21, 2017 5:29 pm    Post subject: VHF Antenna in tail Reply with quote

Hi
Jim Weir designed a copper tape antenna years ago. See sport Aviation
Jan 1981 (attached)
and
http://www.rst-engr.com/rst/products/plasticplaneantenna/plasticplaneantenna_files/2802%20Manual-s.pdf
Very simple and cheap.

Quote:
Time: 07:05:33 AM PST US
Subject: Re: VHF antenna in the tail
From: GTH <gilles.thesee(at)free.fr>

/Le 20/12/2017 02:41, GTH a crit :
/
> /
> On the attached picture of the rear half-fuselage, the glass fin can
> be seen, with the carbon fiber tail cone at the base. A small number
> of foam ribs will be added.
>
> Question 1 : What would be the lightest and most inexpensive way to
> construct an efficient VHF antenna housed in the tail fin ?
> Question 2 : Will it be necessary to build a glass fiber rudder, or
> will carbon fiber be acceptable (weight concern) ?
> /
>
Hi all,

Thank you everyone who responded.
The project is a small airplane with the fin about 800 mm high (~950 mm
leading edge), so space seems a bit limited for a dipole antenna.
Still looking into any solution.
The idea is to design something mostly DIY for cost reasons, so this
seems to rule out off-the-shelf antennas.
Any ideas ?

BTW, what is the influence of the radiating element width/diameter vs
selectivity or else ?
Any hard facts on the subject ?

Thanks for any input,


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