[TowerTalk] 80 meter antenna advice. (NY6DX)
Richard Thorne
rthorne at rthorne.net
Sun Feb 16 16:06:09 EST 2020
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 at kk9a.com
> To: towertalk at 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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