|[AMRadio] 160 meter antenna|
cozy659 at yahoo.com
Mon Jan 12 00:22:48 EST 2009
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.
--- On Sun, 1/11/09, Jim Miller WB5OXQ in Waco <wb5oxq at grandecom.net> wrote:
> From: Jim Miller WB5OXQ in Waco <wb5oxq at grandecom.net>
> Subject: [AMRadio] 160 meter antenna
> To: "Discussion of AM Radio in the Amateur Service" <amradio at mailman.qth.net>
> 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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