Hi Martin,
In the late 70’s and early ‘80’s, Gene KR2N (ex-WB2FZO) had 2 Inverted V’s on
80 meters fed with RG-213 on a ~ 42’ boom up at 120’. He fed them with a T
connector to which I believe was one 1/4 wave phased line of RG11 and he
switched the direction 180 degrees with the use of 2 DPDT 120 vac relays
mounted in a hand-made aluminum box made from sheet metal. The antenna was a
KILLER on 80. He used antenna wire pigtails attached by alligator clips to
change the resonant freq. from CW to SSB and back again.
I can attest to how well the antenna worked – in the 1980 CQWWCW I had the
World-high score and set a New US record on 80 meters, operating from his
station. Some excerpts from the log included:
Only North American station in the log of UK0AAB
JA runs BOTH mornings!
Duped by VK6HD on both mornings.
A run of 5-watt UA9 stations!
I could work anything that I could hear and many mults called me that didn’t
even call the M/M stations on in the contest.
Later I used the same design for a 40-M antenna at my station that was
switchable and reversible.
I heartily recommend the antenna and the switchable design. It is relatively
inexpensively, easy to build and readily available parts and gives exceptional
performance!
73
Bob, KQ2M
From: Martin Pelt
Sent: Friday, March 31, 2017 8:00 AM
To: towertalk@contesting.com
Subject: [TowerTalk] 80 Meter beam
I am putting a 80 meter 2 element inverted vee beam up. It will be at 120
feet with 39 foot boom.
I have 2 questions dealing with switching from phone to cw without lowering
elements and using jumpers.
I plan to use ladder line on driven element coming down to tuner to switch
from cw/ssb. Will this work or is there a better way ?
On the reflector I thought maybe cutting it for ssb the having inductor
with relay at the center to switch to CW. Is this the best way ? If so how
can I easily measure resonate frequency with inductor inserted at the
center ?
73 Martin N4UU
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