Dave, you have to have competent ground help to do all of the weight
lifting. With upwards of a hundred pounds of weight the man on the tower can
only help.
Unless you have obstructions near the tower you should be able to mount a
pulley up on the mast to use in lifting the antenna. The higher, the better.
As the antenna reaches the top, the tower man can manipulate the elements
around the guy wires, one at a time while the ground help slowly raises the
antenna. The elevated pulley is key in allowing the antenna to be moved
around to clear the guy system. An additional rope (tag line) is helpful to
allow the ground help to pull the antenna away from the tower as needed.
The tram system works well but for antennas the size of a TH11 you can
install the antenna in less time than rigging the tram setup.
These are my opinions; as in every task, there are multiple methods that
will work.
73,
Gerald K5GW
In a message dated 6/16/2016 9:52:17 A.M. Central Daylight Time,
w8qwdave@casair.net writes:
I have one of these beast that I have resurrected and am ready to put on
top of a 70' Rohn 45 tower. The tower is properly guyed and
steady as a rock. My question though is how to get the antenna from the
ground to the top of the tower.
At Dayton this past spring I bought the ARRL's book on towers and antennas
and have been reading about "tramming" the antenna to the
top and then placing it accordingly. That seems attractive but this is a
very heavy antenna and my concern is the strength of the
mast to hold the rope tight while the antenna is making its way to the top.
My understanding is that in the "tramming" method the antenna is carried
to the top by a sling (more or less)and then put in place
once it reaches the top.
The other method involves sliding the antenna up two ropes spaced apart at
the bottom of the tower, beyond the guys wires. This
sounds good but there are phasing tubes on the underside of the TH_11 that
could be (most likely would be) damaged in this method.
I've thought abut paying a guy to bring in his crane (lots of height and
lifting capacity), but that's another cost that I'd like to
avoid if at all possible.
So, I'm open to suggestion and the wisdom of the group's experience.
Thanks in advance.
Dave, W8QW
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