| The following three
pictures are the swivel plate that made it possible for me to install the
SteppIR 4 element beam atop my 200 foot tower entirely by myself. It
allowed me to rotate either side of the boom down tightly against the side
of the tower to install the elements. When all is assembled the plate is
secured squarely with four large bolts that pass through around the
center piece.
The tie-wrap was replaced with a stainless cotter
pin. The four through-bolts can be seen in this picture.
Here it is shown starting up the tower. It was pulled
up with pulleys and a Polaris utility vehicle. The fiberglass elements are
tied below the boom, all on individual ropes for ease of handling.
This is a picture of the boom assembly. The pipe down
to the tower is actually the truss support and goes above the plate.
Detail of the rotor installation on the side of the
tower. Note the notches in the top plate. The boom swivels down into
either of these depending upon which end of the boom is to be worked on.
At the top of the tower and almost ready to swivel in
place. The bent pipe in the background is an old electrical conduit which
was taken down later.
A hand winch was used to complete the path from the
pulley on the bracket to the boom mounting plate. I am shown winching it
up in this picture
Fully atop the tower, but no elements yet
The completed antenna
|