I think I am going to use both antenna systems and see what works best. Thanks
all
Sent from my iPhone
> On Feb 16, 2020, at 11:16 AM, Jim Thomson <jim.thom@telus.net> 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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