(Forward to the whole group).
---------- Forwarded message ----------
From: Larry Loen <lwloen@gmail.com>
Date: Wed, Oct 23, 2013 at 1:38 PM
Subject: Re: [TowerTalk] Thoughts on towers suitable for my difficult
location?
To: Jim Lux <jimlux@earthlink.net>
I agree with you, Jim, but to play devil's advocate a bit, maybe you plan
for something that basically doesn't survive.
Suppose you have a TV push up mast style design that is guyed decently.
Forget the house. You put a two element quad on it or a small Yagi and
only go up 43 feet. KY6R proved that even living in a big bowl in
California, you can make Honor Roll with such a setup. They key is a very
light windload. You don't go all out. Say, a quad or a two element
monobander.
So, maybe you just make sure it can't fall on anything interesting and
build simple??
Me, I'd go for the big tower with the (engineered) deeper hole. But, if
you have the space and you don't have to worry about it falling on someone,
maybe you plan for something inexpensive that you can simply replace. It
would also be collapsible in the event of a hurricane as well. The big
worry would be unplanned storms or maybe being out of town when the
hurricane blows in quickly.
This is a non-winter zone as I recall, so the usual "ice" discussion for a
quad should be a non-issue. So you replace it a couple of times? Cheaper
than a big, hefty tower.
But, I'd have to be very sure about it not falling on someone.
Larry WO7R
On Wed, Oct 23, 2013 at 12:59 PM, Jim Lux <jimlux@earthlink.net> wrote:
On 10/23/13 12:33 PM, Drax Felton wrote:
If it's bracketed to the house then the house should already be on a
stable foundation. Why the expense of a PE for a short 40 ft tower? Use
a hazer or tilt base and crank the darn thing down when a hurricane
approaches.
Most houses aren't actually all that good at withstanding localized side
loads. They're designed to hold roof up, and depend a lot on gravity to
keep things oriented and attached. It's often hard to find a place to
attach the tower that can take the loads. The fascia boards will rip right
off. Hooking to the between floor beams/joists on a 2 story house is
probably reasonably secure (but you'd need to check the house design).
I'm of the general opinion that bracketing is something to support a short
or telesecoping tower which is frighteningly wiggly to climb, not to
withstand significant wind loads. It doesn't take much of a lever arm to
develop amazingly high lateral forces on your house's structure.
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