Remember the old Hy-Gain "Hy-Tower" ? It had tuning stubs brought out from
various places in order to provide resonance on 10, 15 & 20 M, maybe even
one for 40M. I have a manual around here but am too lazy to go find it.
Anyway, I believe it was 57 feet overall and was rated for 80 - 10 M. You
could add a base loading coil and an additional length of wire off the top
mast for 160M. With an adequate radial system, they were the "cat's meow"
of verticals back then. I always wondered how the connection points for
those "resonators" was determined. Probably to limit interaction with other
bands (??) Maybe some sort of similar set-up could be done with parallel
wire stubs.
I remember trying to tune a four pair parallel wire dipole for 20, 17 , 15
and 10 M. What a bear. Tweak one band and it would screw up the others. I
finally got it tuned, but had to completely replace all the wires since I
had chopped and re-soldered all of them so many times. I used ½" PVC pipe
spreaders which kept the four wires about 2" from each other. Once up, it
would have been impossible to re-deploy due to tangles.
73, Charlie k3ICH
----- Original Message -----
From: "Jim Brown" <j...@audiosystemsgroup.com>
To: <elecraft@mailman.qth.net>
Sent: Tuesday, September 03, 2013 11:03 PM
Subject: Re: [Elecraft] 43 Ft Vertical and Elecraft Tuners
On 9/3/2013 7:30 PM, Fred Jensen wrote:
With the KPA500 at 500W, on 40m, I get a lot of RF from the GAP screwing
up things like the WinKey, the laptop, and various other digital gadgets.
The first thing I would do is put a serious ferrite choke on the coax at
the antenna. If that doesn't fix it, I'd say it's radiation from the
antenna itself.
73, Jim
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