- Some photos of an HD-70 Tower being installed in Central Iowa.
Radio Station - K0KT, Ames, Iowa
thanks goes to Bill / K0KT for providing the following narrative.
Simmonds, President of ANW Towers (second from the left) delivered this shipmenthimself.
shown are locals Dave KI0Q (local tower and climbing expert), Denny (buildingcontractor for
new house) and his son Jamie. The locals came over to help unload the truck and willalso
with the construction and erection of the HD-70.
of the stuff will be stored in the garage until the concrete has cured. In additionto the HD-70,
also delivered the 2 7/8 inch diameter 22 foot long 1026 DOM high-strength carbon steelmast in
foreground and 150 feet of Nello 25N tower sections, that are just behind the HD-70sections.
Nello tower sections are for three Array Solutions AS-25N-80 verticals to beused for an 80-meter
array. As you can see in the picture, the top section of the HD-70 has a rotatorplate as well as
a mid-plate. The mid-plate will stabilize the long mast, should the rotator ever haveto be removed. The
bearing has been installed on the plate at the top of the tower. Also note theclimb-protection
to the right. Everything shown in this picture was ordered through Array
is the rebar for the pad and pillar base, surrounding the base section. Note the4-inch
and the #4 copper wire that will run back to the single-point ground at theresidence.
you can see the forms for the pad and pillar base. Making these forms requiredextra time
effort, but the smaller footprint of the pad and pillar base appealed to KA0IOR(K0KT's wife).
base section was leveled with a laser level, but checked with an old-fashioned 4-footbubble level.
the 2x6s and stakes that were used to keep anything from moving when concrete ispoured.
is the beginning of the concrete pour. A second truck was on its way with the
of the concrete that was needed.
is being added around the edges for the pad, and the pier is being finished.
A couple of months later, house construction had been completed, the concrete had cured, and it
was time to put up the new tower. The first step was to lay out the seven 10-foot sections, in order.
erection was a new experience for Denny's crew. Here they are doing a dry-run using only
the bottom section to make sure everyone knows what to do the next day when it is time to lift the
tower with the crane.
skid-loader is being used to position the sections as they are bolted together. Note the
big bucket of bolts that came with the tower.
photograph shows the 22 foot 1026 DOM high-strength carbon steel mast and the
PST71D rotator. Note the climbing steps (large bolts protruding from the top tower edge)
on the HD-70 and the Safety Lifeline System (3/8" x 19 galvanized aircraft cable) running to the
top of the tower. K0KT will be safely connected at all times when he climbs his tower. The steps
on the mast above the top of the tower are temporary and will be removed after all of the
have been installed.
At the end of the day, the HD-70 and an OptiBeam 4-40 4-element 40-meter Yagi are both ready
to be lifted when the crane arrives in the morning.
of the tools and parts have been set out, ready for the lift. The #4 copper wires are the ends
of the three 60-foot lightening-protection radials that were installed for the tower.
is the beginning of the lift.
the HD-70 is nearly vertical.
the crane lifted the HD-70 to vertical, it was moved over the base and here is being guided down.
crew is tightening the bolts on the first leg to be attached. Everything went very smoothly
for this novice crew. Obviously only two people would have been needed, but all wanted to be
for this part of the project. From the time of the arrival of the crane to this point took only
antennas up and down a non-guyed tower is relatively easy, but because the crane
was there it was also used to lift the OB4-40.
KI0Q, is attaching the OB4-40 to the mast.
in the day the rest of Andy's family stopped by to see the work. His sons wanted to
the tower! Clearly, it was time to install the AN Wireless climb-protection panels.
the HD-70 will be impossible to climb without a 10-foot step ladder.
from the street. Neighbors have commented on the beauty of the installed antenna system.
is picture of the completed HD-70 and antennas from the top of one of the 80-meterelements.
a wide margin for safety, relative to the maximum design load of the HD-70, thetower supports
OB4-40 at 80 feet, an OB16-2 at 71 feet, inverted vees, and VHF/UHF antennas.