The main job
of this tower is to support wireless data communications between
two office
buildings in Hagerstown, Maryland, however it also serves double-duty
to support
an HF triband yagi antenna.
I spent a few
hours at this jobsite, and I was impressed at the simplicity of this
low-power
winch, with a 120 VAC drill used to drive a small pulley through a reduction
gearbox. This
was used to raise several items to the top, including the HF antenna.
The twin mounting
plates are now in position, along with a 12' mast. It's barely
visible in
this photo, however the upper mounting plate also has a 30" support
pipe welded
directly to the plate to support a small grid dish antenna.
A few photos
now of the HF tribander being raised. The two ropes running vertically
are used as
slide ropes for the yagi to ride on, while the gin pole rope did the lifting
at the center
of the antenna mast.
I personally
took this photo while doing some final tightening and antenna aligning.
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