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[TowerTalk] 80m 1/4wave vertical construction

To: <towertalk@contesting.com>
Subject: [TowerTalk] 80m 1/4wave vertical construction
From: "Dave N0RQ" <n0rq-1@dfwair.net>
Date: Fri, 24 Oct 2003 13:44:05 -0500
List-post: <mailto:towertalk@contesting.com>
I am hoping to build an 80 meter 1/4 wave vertical, but have several practical 
questions.

Size of aluminum tubing?  I don't want to waste $ and buy too big, but obviously
don't want it too small either.  http://www.texastowers.com/aluminum.htm
shows what TT sells (and thankfully they are local to me).  I plan to get the 
12'
lengths (unless that is a bad idea for some reason).  Do I start with 1.75" and 
step
down ending up with 1.25" on top?  Bigger/smaller?

What about a guesstimate on the length, using tubing like this?  If a wire 
dipole leg
would be 61.25' (468 / 3.82MHz / 2), what would be a good starting length for 
tubing?

Also need an idea on making some sort of attachment point a little over halfway 
up
to attach some dacron "guys" for support.  Simple smallish eye-bolts?
Should I be concerned about dacron getting wet and affecting SWR/performance?

And what is the best way to attach the bottom of the antenna to a 4x4 post, 
maintaining insulating properties from the post but yet very strong.  Perhaps
grey PVC over the aluminum and some sort of bracket?  I'm having problems
visualizing it...

Dave N0RQ
_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
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