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Re: [TowerTalk] Top Hat Vertical

To: "" <>
Subject: Re: [TowerTalk] Top Hat Vertical
From: Bryan Swadener via TowerTalk <>
Reply-to: Bryan Swadener <>
Date: Wed, 1 Jul 2015 06:41:47 +0000 (UTC)
List-post: <">>
On 160, I feed my 80m cage inverted vee (apex at 70' AGL) against ground. I use 
a vacuum relay in a box just downstream from my ground bus to do the switching, 
with a bias tee in the shack to feed DC to the relay coil. Of course, there is 
no choke/balun at the apex. So far, I have a couple dozen radials in the 
ground, and it seems to play well. My TS850SAT's ATU is able to tune it fine. 
See for more detail.
vy 73 es gl,Bryan WA7PRC

     Date: Tue, 30 Jun 2015 21:32:12 -0400
From: Ed Sawyer
Subject: Re: [TowerTalk] Top Hat Vertical

Same here. My T vertical for 160 is 100 ft vertical and 82 ft horizontal.
That makes the antenna resonant below the band, with a feedpoint Z of 50
ohms plus some inductive reactance on 160M. I add series C to tune out the
L. The same idea will certainly work on 80M.

I believe that this antenna is functioning as a 3/8 wave vertical.  Which is
nice, but not necessary for good performance.

I have a 70 ft high vertical portion with a total hat of about 45 ft (22.5
ft x 2).  It resonates at 1.84Mhz with 20 Ohm impedance.  It is fed against
a ground rod and 45 radials mostly long.

Works quite well.


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