JK has a nice compact 80m dipole (JK801) with T-Bar loading. It uses a
Tornado tuner for moving around the band. You can cover the entire
75m/80m band. It's only 55' long and is very stout.
I used the Ameriton SDC-102 screwdriver controller and had issues with
it. I had to reset it on a regular basis.
I now use a Green Heron RT-21dc to control the Tornado. I use the Green
Heron Everywhere software which gives me 12 pre-sets which is plenty to
cover the entire 75m/80m band the way I need it to.
Rich - N5ZC
On 2/16/2020 10:16 AM, Jim Thomson wrote:
Date: Fri, 14 Feb 2020 13:23:30 -0600
From: john@kk9a.com
To: towertalk@contesting.com
Subject: Re: [TowerTalk] 80 meter antenna advice. (NY6DX)
<That's funny Jeff:) In reality an 80m beam can be built strong enough
<to survive the midwest. I had a homebrew linear loaded dipole with a
<90+ ft element 160' high that held up well in Chicago. However if you
<want to operate both CW and SSB, you will need relays on the elements
<which can be problematic and difficult to maintain.
<John KK9A
## Heres where loaded elements would be a huge asset...to minimize max
ele length .... which can be made
stronger....vs a full sized ele. T bars, aka capacity hats would be a
good loading scheme. That plus
loading coils, just inboard of T bars. The remaining loading, and
ability to switch from cw to ssb
can be done with fixed coils and a mess of relays.... or a seco
systems tornado drive..which is just
a pair of compressible, plastic coated, .25 inch od copper tubing
coils. The seco uses an ameritron SDC-102 screwdriver
controller, 12 vdc, to expand and compress the coils. Comes with a
digital readout turns counter..and 10 x pre-sets.
Tornado drive installed at feedpoint of each ele.
## If relays are used, use gigavac SPDT G2 type ceramic vac relays,
or Taylor brand V2 SPDT ceramic vac relays... available
in 12 vdc or 26.5 vdc. If mech relays have to be used, use DPST
types, with contacts in parallel...... for redundancy.
Jim VE7RF
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