[TowerTalk] Rohn 20/25G leg insulator material

[K1TTT]

In my rohn catalog the self supporting height for 25g in 70mph area with no
ice is only 40'... still a bit short for 80m.


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: Allen R. Brier [mailto:n5xz at earthlink.net]
> Sent: Monday, April 13, 2009 20:39
> To: towertalk at contesting.com
> Cc: 'Rick Hiller'
> Subject: [TowerTalk] Rohn 20/25G leg insulator material
> 
> I wish to build an 80 meter vertical using some Rohn 20G sections I have
> in
> storage. In the past there was some mention of insulating material that
> could be used at the base. If possible, I would like to get that
> information
> again from the group. I would like to make the vertical self supporting
> i.e.
> no guys (bosses request). Will the material be strong enough for that?
> 
> In addition, what would be a good recommendation for the vertical
> configuration, i.e. how many 20G sections and how much of a stinger on
> top?
> Obviously maximum bandwidth and efficiency is the goal and I operate
> mostly
> CW.
> 
> Next, I would also like to consider using the same antenna on 160 meters,
> by
> switching in a loading coil at the bottom. I know this isn't optimal, but
> I
> would like some recommendation for how much inductance in would need, or
> the
> coil configuration (full legal limit, of course). Other recommendations
> would also be appreciated.
> 
> Finally, I also have a 70 foot crank-up tower with a 4-el SteppIR on top
> that could be shunt fed. If I did shunt feed the tower, what would be the
> optimal distance between them for phasing purposes?
> 
> A lot and questions in one email but I would appreciate any and all
> advice.
> 
> 73,
> 
> Allen Brier N5XZ / KL5DX
> 1515 Windloch Lane
> Richmond, TX 77406-2533
> 281-342-1882
> 713-705-4801 (Cell)
> n5xz at arrl.net
> 
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> 
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