[Antennas] How to make an Air Cooled 315MHz antenna

[James Duffer]

The first thought was this an April 1st article, but second thought was it was probably a typo      "air cool" vs "air coil"
73,Jim, wd4air
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From: antennas-bounces at mailman.qth.net <antennas-bounces at mailman.qth.net> on behalf of mail at crcomp.net <mail at crcomp.net>
Sent: Tuesday, April 3, 2018 9:59 PM
To: Antennas at mailman.qth.net
Subject: [Antennas] How to make an Air Cooled 315MHz antenna

Greetings,

https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.byvac.com%2Fdownloads%2FRLnn%2FHow-to-make-a-Air-Cooled-433MHz-antenna.pdf&data=02%7C01%7C%7Cfa99183b3b0f41e8b6d808d599d816d5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636584075743078966&sdata=Dsw%2BsFjs4xsgbauliT40dfZvQykejpL4BvixUtBIoxk%3D&reserved=0

shows how to make a 433MHz antenna that's a little over 70mm in length.
433MHz is typically used for radio controlled devices in Europe. While
315MHz is typically used for radio controlled devices in America.
    Very short and very simple whip antennas of this nature are not
covered in my ARRL antenna books. The lengths also don't seem to jibe
with fractional wave lengths. Does anyone have any ideas about scaling
the 433MHz whip back to 315MHz? The more theory, the better.

73,

--
Don Kuenz, KB7RPU

Genius is nothing but a greater aptitude for patience. - de Buffon

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