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Re: [TowerTalk] 160m vertical

Subject: Re: [TowerTalk] 160m vertical
From: "Rob Atkinson, K5UJ" <>
Date: Wed, 27 Sep 2006 14:44:15 +0000
List-post: <>
for 160 essentially, the more height/loading the better (up to a point, around 190 degrees, beyond which you start getting all kinds of high angle lobes, but not too many hams have insulated base fed 250 foot towers for 160). For loading, a top hat beats inductors at the base and middle always. you want cheap height and rigidity. not knowing your site, i'm shooting in the dark but if you have the time to scrounge, try rounding up a number of sections of used rohn r20. these are light weight (but they won't be holding anything but a hat) and can be had for around $40 each, used ($80 new). if you can stack 5 on insulators and guy them they'll hold a fairly large hat, or you could add a vertical pipe extension to the top to get more height (another 10' would give you 45 degrees) and you could always hang a wire off the top for another 60 or 70 feet out to a tree or some other support. Put at least 60 radials at least 1/8 w. down and a motorized matching network at the feed point and this thing would kill.

I know you asked about inductors, but if possible you should first consider something at the top, either a hat or wire, so the L at the bottom isn't huge--you'll gain more efficiency and make it possible to operate with a remoted matching network at the base, or tune it in the shack using a run of 213 and have a wider freq. range.

rob / k5uj

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