[TowerTalk] 80 meter antenna advice. (NY6DX)

[electric911inc at hotmail.com]

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 at telus.net> 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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