Gregg,
234/f says that a quarter wave on 3.8 is 61.58 feet.
If it were me, I'd start putting in radials, and hook the thing up to
the rig, or
an antenna analyser, to see what you've got. Worst case, you may
have to
go topside and drop in a 2' piece of tube.
25g should make perfectly fine connection between sections, properly
bolted.
Adding jumpers won't make it measurably better, unless the tower was
painted
before assembly.
I'm considering something similar, here, with 40' of 25g and a 24'
section of 2" mast.
Jim/N2EA
Message: 8
Date: Fri, 20 Mar 2009 22:56:46 -0500
From: "Gregg Seidl" <k9kl@centurytel.net>
Subject: [TowerTalk] 75/80 vertical
To: <TowerTalk@contesting.com>
Message-ID: <B3933CD4A80D413BB0106C9BEF1F0C81@K9KLStation>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Well now that most of the snow has melted its time to finish last years
antenna projects!! My question is this: I installed 60 feet of Rohn 25
insulated from ground. I used the tapered top section as I'm going to
use a
peice of pipe to "finish" the length. I'd like it to resonate at 3.8
Mhz.
About how much pipe do I need to add to make it work. I have one of
Array
Solution AS-80 tuners. I will be using about 60-80 radials about
60-100 feet
long. Tha way the tuner works is it needs to resonate at 3.8 or so
and then
it switches in inductance to tune it to 3.5 and 1.8.
Does Rohn 25 typically make a good connection between sections? I was
thinking about running a piece pf copper wire from bottom to top secured
with some copper-ox and circle clamps. Good idea or?? Thanks Gregg
K9KL
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