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VK3ABK > WANTED 24.09.04 04:37l 40 Lines 1863 Bytes #999 (0) @ WW
BID : 24620_VK3KAY
Read: GUEST
Subj: 70MHz Horizontal Mobile Ant. Again!
Path: DB0FHN<DB0RGB<DB0SL<DB0FSG<DB0PV<DB0MRW<OK0PKL<OK0PCC<OK0PAD<OK0PPL<
DB0RES<ON0AR<ZL2BAU<VK3KAY
Sent: 040924/0320Z @:VK3KAY.#WEV.VIC.AUS.OC #:24620 [Wendouree] $:24620_VK3KAY
From: VK3ABK@VK3KAY.#WEV.VIC.AUS.OC
To : WANTED@WW
Hello again Ant-ers.
The simple question asked by Eldred, ZS1DJ, is in danger of starting one
of our international incidents so common on packet and elsewhere.
It is always interesting, and informative, to get comments from someone
who is experienced and qualified to comment; and Rudolf, PA2RHB is just that.
I would rather see a few lines of algebra, and recorded results, than a long
waffle of claims to fame, and be left to wonder what it all means.
Eldred asked for details of a 'HORIZONTAL ANTENNA' (sic) for 70MHz mobile.
I must admit that I took this to mean 'mounted' horizontally, not polarized
horizontally. But no matter, mobile radio depends more on location than the
polarity of the RF radiated, and I doubt that in a mixture of city buildings
and trees etc., that much difference would be noticed.
A vertical antenna, quarter or five-eigth wave would be liable to hit a
low car-park entrance or other obstruction. Our taxis and several public
utilities used to have these long 72 MHz verticals, but they were usually
hinged at the base so they could be folded onto the car roof. The common
quarter wave antenna used for years by FM mobiles would have much of the
radiation at an angle between horizontal and vertical, but it worked ok.
I appreciate Rudolf's comments, and mathematical argument, and I'm sure that
Eldred will take this into account. The DDRR antenna I described has been
patented and featured in several magazines, including the ARRL Handbook for
several years from 1965, including the 43rd edition that Rudolf suggested. It
has been an 'interesting experimental antenna' and is simple and convenient
for various applications. Worth a try for the experience to be gained.
This is what makes Amateur Radio worth the licence fee we are willing to pay.
73. Dick. VK3ABK.
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