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Date: | Sun, 28 Jul 2013 09:27:52 +0100 |
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What is your beam?
Also is gain and front to back ratio?
ATB
David W Wood
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Ian Westerland
Sent: Sunday, July 28, 2013 9:16 AM
To: [log in to unmask]
Subject: Doublet antenna
Hi fellow hams and other interested list members.
Some time ago there was some discussion on the list about doublet
aerials and I promised to keep you updated with the progress and
operation of the one I was constructing. Well, it's up and working
really well. Just needs some optimizing.
The aerial is 130 feet total length fed in the centre. i would have
liked it slightly longer but the 130 feet is very satisfactory. It
is fed with 300 Ohm feed but not ladder line and that comes down to a
1:1 balon, a short length [about 3 feet] of RG-213 coax, into an LDG
auto tuner and to my TS-590S.
It loads on all bands from 80 to 10 meters but is slightly hard to
tune on 10 meters. This can be fixed with slightly longer feed
line. About a foot should do the trick.
I have worked into Europe, Asia and the States with it on 20 meters,
40 meters and 15 meters with reasonable reports that are about 3 S
points down on my 4 element beam so the results are really very good.
Making the aerial and feed system randum length also works and I will
make another one for portable use.
At present it is in the inverted V configuration with the centre at
40 feet [12 meters] from ground but I am going to raise the legs to a
more horizontal polarization due to exessive noise.
I hope this helps those who were thinking about making this very
effective aerial.
Ian, VK3vin
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