Tram Line Antenna Installation de N4KG
I run my tram line from the tower MAST (it is much stronger than a gin
pole)
down to a tree or other anchor point, using clove hitches to secure the
(1/2 inch) nylon ropes.
>From the tram line, I suspend an "inverted V" rope (10 - 12 ft), tied in
the
eye of an upside down pulley. The ends of the rope are tied across the
boom in a balanced configuration, again using clove hitches, with a
backup
knot to prevent the remote possibility of the rope pulling through
itself.
ANOTHER inverted vee rope is tied to the boom at the ends and the center
of the V is tied to the pull-up rope which goes to a pulley tied to the
mast,
down the side of the tower to another pulley tied near the base of the
tower,
and pulled out laterally from the tower by 2 or 3 volunteers or a garden
tractor.
The second V "steers" the Yagi elements, keeping them parallel to the
tram line.
By carefully adjusting the positioning of the clove hitches on the boom
(where the input and output ends of the rope come off angularly) you can
actually use them to "lift" the approaching elements. This gets a bit
tricky.
Another approach is to affix a "tiller" bar to the boom using angle
aluminum
and a muffler clamp. Then tie the pullup rope to the end of the
tiller.
This will result in the elements being vertical at the top. The muffler
clamp can then be loosened and the elements rotated back to horizontal
for installation.
de Tom N4KG
............................
On Tue, 07 Apr 1998 21:38:33 -0500 Larry Burke <lburke@wt.net> writes:
>
>OK, now that the discussion of intermediate supports for masts and
>rotor
>loading has died down from my original post (answers were very
>intersting by
>the way!), it's time to start a new thread.
>
>For those of you who have used a "tiller" to prevent a yagi from
>"turtling"
>while being trammed up to a mast.... would you mind describing how the
>tiller is constructed and particularly how it is attached to the tram
>wire
>(I assume it is attached?). There are references in the archives, but
>I
>couldn't find one that was detailed enough for me to visualize the
>device
>(remember I am an engineer and you have to type S-L-O-W for me to
>understand
>you).
>
>
>Larry WI5A
>Friendswood, TX
>
>
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>
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