Towertalk
[Top] [All Lists]

Re: [TowerTalk] 160 meter odditiy

To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] 160 meter odditiy
From: "Ron W8RJL" <youngron@verizon.net>
Date: Tue, 06 Jan 2015 23:04:08 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
As noted in the handbook, K factor is important for antennas above 30 MHz especially when using rod or tube for elements but any change in diameter will have an impact even at 160 meters. I have made cage dipoles for 80 meters and the old tried and true 468/f in MHz does not work due to the K factor. Agreed going from from 0.080 to 0.128 is a small change but you can't say it is to small to make a difference. I still say prune the antenna and don't worry about it.

Ron W8RJL

----- Original Message ----- From: <john@kk9a.com>
To: <towertalk@contesting.com>
Sent: Tuesday, January 06, 2015 9:08 PM
Subject: Re: [TowerTalk] 160 meter odditiy


#12 wire is 0.080", #8 is 0.128.  This is not a big enough diameter change
to make a difference.

John KK9A


Re: [TowerTalk] 160 meter odditiy
from [Ron W8RJL] [Permanent Link][Original]
To: "Tower and HF antenna construction topics."
<towertalk@contesting.com>
Subject: Re: [TowerTalk] 160 meter odditiy
From: "Ron W8RJL" <youngron@verizon.net>

John,

The larger the diameter of the conductor the lower the frequency for the
same length. It used to be called the K factor but I think they have a new
name for it. Check any good antenna handbook for formulas etc. You can
correct by trial and error, just folding back a few inches on either end and
clamping with a split bolt. Using a 3" diameter tube vs a #12 wire on a 40
meter 1/4 wave vertical can be the difference between 30 and 33 feet if I
remember correctly.
73,
Ron W8RJL


-----
-----Original Message----- From: john nistico
Sent: Tuesday, January 6, 2015 6:01 PM
To: towertalk@contesting.com
Subject: [TowerTalk] 160 meter odditiy

I have been using an inverted l from my hdx 89 tower with much success. It
is made of #12 stranded wire and I have decided to upgrade it to something
more beefy. I removed the antenna which played at 1840 like gang busters and
cut an Identical wire #8 and put it up in its place. No other changes were
made but when I went into the shack and checked it it was at 1723. Anyone
have an idea why 2 identical wires would appear so different?




John J. Nistico
911 Electric Inc.
516.325-8993

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>