|[AMRadio] 160 meter antenna|
JACK C. SHUTT
w9gt at verizon.net
Mon Jan 12 12:30:35 EST 2009
We have several of those wireless towers and monopoles around here, as well Those side wires are safety cables that climbers can clip on to with fall-arresting lanyards and harnesses, they are not radiators.
Anyway, the folded unipole is a worthwhile antenna to try. I have had excellent results with an inverted L running up the side of my 80' tower and the "horizontal" portion sloping out to a tree. The "L' perhaps looks more like a vee with one short leg. Total length is about 135 ft. I use a coil and capacitor parallel network at the base of the tower feeding the end of the antenna wire then coax back to the shack. As always, a good radial system really helps.
73, Jack, W9GT
--- On Mon, 1/12/09, robertcharles at att.net <robertcharles at att.net> wrote:
From: robertcharles at att.net <robertcharles at att.net>
Subject: Re: [AMRadio] 160 meter antenna
To: cozy659 at yahoo.com, "Discussion of AM Radio in the Amateur Service" <amradio at mailman.qth.net>
Date: Monday, January 12, 2009, 7:23 AM
Neal. Thanks for the link on building the Unipole. I had worked for Sprint for some time and I noticed they were using that same concept on many of their towers. The link was exceptionally helpful
-------------- Original message from neal Newman <cozy659 at yahoo.com>: --------------
> Jim you only need 50 feet of verticle space.
> why not just build yourself a Folded Unipole antenna if you Dont know how. Ask. its really easy. Just Run 3 lengths of #12 wire or if you have it #6 wire. short them up at around the 50 foot point and use 1" PVC
> Tubing as Insulators with clamps Down the side of the Tower.
> at the bottom Each wire is isolated with PVC from the Tower.
> BTW Each wire should be about 12" or more off the tower. then Tie all 3 wires together with a ring of #12 and take that as the Lead to the antenna tuner. Run at Least 4 ground radials 50 feet long If you can get
> the space make them 120 feet...
> and you will have a Killer 160 antenna. if not make an inverted L Run a wire thats 130 feet long. as far vertically as
> you can then run the rest out horizontally... again you need at least 4 ground radials.... the unipole is what we use for
> Broadcast stations when we are tight for height or space on a grounded Tower.
> CE- WTTM/WHWH/WJDM/WIBG/WFYL
> --- On Sun, 1/11/09, Jim Miller WB5OXQ in Waco wrote:
> > From: Jim Miller WB5OXQ in Waco
> > Subject: [AMRadio] 160 meter antenna
> > To: "Discussion of AM Radio in the Amateur Service"
> > Date: Sunday, January 11, 2009, 11:28 PM
> > I always wanted to try am on 160 but like most do not have
> > enough room for a full size antenna, so,
> > I am considering building a 160 meter antenna at our
> > clubhouse because there is a 80' tower there and over an
> > acre of land to spread out a 1/2 wave dipole. Question is;
> > 1 Is a 1/2 wave wire dipole the best antenna for the band
> > considering there is room for it.
> > 2 Is 80' high enough for the center of the inverted V?
> > 3 How high do the ends need to be off of the ground?
> > 4 Should I feed it with coax or ladder line to the 10'
> > level (or other) then a balun to coax to the tuner (coax is
> > the only acceptable line into the shack)? The shack is a
> > metal building 30X60' and directly below the tower.
> > There is no way to get ladder line to the operating position
> > since all cables have to run through a 3" conduit for
> > at least 30'.
> > The tower is a free standing commercial tower made of 4
> > 20' sections bolted together with a 2 meter and a 440mhz
> > antenna at the top, all ham antennas.
> > Thanks for any advice. Jim
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