In a message dated 6/25/2007 5:56:57 P.M. Pacific Daylight Time,
> I want to install this tower, and I want to do it properly. I've spent
just getting it on-site, and I'm willing to spend more to install it as it
should be installed. To this end, I've assembled some bits and pieces
the project, but I'm just not clear how to best proceed. I really want to
the work myself if possible, not out of penny-pinching as much as I'd like
have the sense of accomplishment.
> What I have so far:
> A Tri-Ex 71' HZN-471 Crank Up Tower (pictures on the link below)
> A Cushcraft A4S with the A744 add-on for 40m
> No rotor/thrust bearing/whatever yet
> There are a dozen sites that lovingly detail the installation of a tower,
while they are all similar they are all different, too. My tower, as you
see from the pictures, is older (40 yrs?) and is thus no longer supported by
engineering drawings or anything per Karl at Tashtowers, the successor
to Tri-Ex. The closest thing seems to be the LM-470, but the
detail in the engineering drawings for the base isn't really clear to me.
You mean he won't give you any help with the base? What's ambiguous
about the drawings?
> The guys on eHam said the tower seemed sound in the pictures, but that
about the extent of what they were able to say. I believe they were all in
California, so an on-site inspection was out of the question.
I didn't see anything alarming from the photos. Everything looked like it
was in decent shape.
> Is there a site I've missed that has good newbie tower base information?
only time I ever did concrete was putting up 12' satellite dishes...this is
quantum leap, and I'm very aware that once I've poured 4 yds of concrete,
This is an engineering question. Either talk to Karl about specifics or
have an engineer run the calcs and design the base and anchors.
You can make some inferences from similar US Tower models but none of
theirs use guys so it'd be apples and oranges.
> I'd be particularly interested in the experiences of anyone who has put
similar tower, but I would be grateful for any advice, links, expressions of
pity, and especially any input that gets me closer to seeing this beast
vertical instead of lying on the ground.
Are you going to get a building permit? If so, you'll probably need the PE
drawings for the application package. If not, you still need some engineering
help. Maybe there's someone in your local ham club that's an engineer and can
help. There are several steps to follow after this; e.g. rebar cage,
excavation, concrete pour, getting tower to the base, etc.
TOWER TECH -
Professional tower services for hams
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