In a message dated 10/18/2006 12:51:57 P.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> I have built a single line tram to lower my TH6DXX from 60 feet and raise
a new Force-12 C3E/D. The tram consists of a 4 foot length of 1 1/2 inch
PVC pipe. Across one end I attached a 3 foot piece angle iron using a muffler
clamp at a right angel to the pipe. Also, I used some angle iron (it is the
stuff you use to install garage doors) from the from the tips of the 3 foot
piece to the back of the PVC Pipe. The PVC pipe acts as a tiller...while the
cross piece of angle iron acts as a seat to the boom of the antenna.
> The troubling part of this is the single line. I've seen double line
tram systems but I just don't have the room to do that. City lot stuff. So,
using a single tram the issue is that the antenna could roll if it out of
balance. Obviously, balance is very important here.
> What I did is used a piece of rope connected under the cross arm tha
carries the boom up and hung some wieght below the tram to keep it balanced.
The
more weight ...the more stable it should be ... but that comes at a cost.
The weight is fixed on the rope to keep the whole tram in balance....but that
doesn't mean I can sloppily put the boom on the tram without taking into
account balancing the antenna.
> The whole mess has to go up to the tower and will travel less than 150
feet.
"Mess" is one way to look at it. Let me clarify a couple of things on this
topic. A TRAM system is one in which the load is suspended below a single
tramline. A TROLLEY system uses 2 wires (or tracks like a trolley car) where
the
load rides on top of the wire/tracks.
The tram system is so simple and only uses one cable for antenna
installation where the trolley system is a big PITA to rig, very difficult to
keep the
antenna balanced plus adds a bunch of additional friction to the load on its
way up that I can't see any reason to use it.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
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