> Do elevating the guys reduce the distance required from the base to the
> posts? Or should they still be 60% of height out?
It's the angle that is important so the posts would be in closer but you can
end up putting one whale of a bending moment (due to guy tension)on the
pile of concrete the post sets in. Depending on the load the amount of
concrete may need to be increased substantially. Using trig, calculate the
total horizontal force the guys put on the posts, add the force from the
wind, and then multiply the result by the height above the concrete for the
guy attach points.
Periodicaly measure the posts to see if they are still in plumb or how far
out of plumb they have moved.
Way back when:
With a 90', small tower holding a TH-5 and a TV antenna I used 4 point
guying with 5" pipe (high way sign posts) set in about a yard of concrete
and extending 10' above the concrete. In 10 years the tops of three had
moved between t wo and three feet while the 4th had not moved at all.
>
73
Roger (K8RI EN73)
> --scott N9LJX
>
> On 7/30/07, Roger (K8RI) <K8RI-on-TowerTalk@tm.net> wrote:
>>
>>
>>
>>
>> > My guy posts were painted. I surface prepped them with a
>> > angle grinder followed by a primer coat of rust-oleum and
>> > then two coats of a finish (also rust-oleum). These are
>> > 10' 4" pipe set into concrete about 3'. They support a
>>
>> IIRC mine are 16' of 6" set through about 17,000# of concrete. The base
>> has
>> two 12 to 16" pieces of rerod welded across the base with two more at
>> riht
>> angles. This sets in 6 to 8" of crushed rock under the concrete.
>>
>> > 59' tilt over tower. The white paint makes them stand out more
>> > to help prevent the "ooops there's a post there" incidents.
>>
>> I don't worry about those big posts, but I have bright yellow hose
>> slipped
>> over the lower guys for visibility.
>>
>> Roger (K8RI - EN73)
>> >
>> > 73,
>> > Jon
>> > KD5SFA
>> >
>> > -----Original Message-----
>> >>From: Arthur Trampler <atrampler@mchsi.com>
>> >>Sent: Jul 30, 2007 12:43 PM
>> >>To: T talk <towertalk@contesting.com>
>> >>Subject: [TowerTalk] galvanize v. paint
>> >>
>> >>The good news: the XYL has gotten past her revulsion of guy-wires, even
>> on
>> >>our small lot with too many trees in the wrong place.
>> >>
>> >>The bad news: she wants the guy wires elevated so our 14 year-old will
>> not
>> >>decapitate himself before he begins thinking again in the next two or
>> >>three years.
>> >>
>> >>Tower: simple Glen Martin 50' tower, 18" face, with Hazer. Single guy
>> at
>> >>top of tower.
>> >>
>> >>Antenna load: small tri-band yagi, 6.5 square feet.
>> >>
>> >>Supports: 4" flange x 4" deep steel I-beam, 3' in concrete, 7' above.
>> >>
>> >>In short, the beams are about $65 each, and galvanizing adds another
>> >>$60
>> >>each, pluse $150 shipping for all three.
>> >>
>> >>I also have a custom-made, two-piece folding mount for my AV640
>> >>vertical
>> I
>> >>would have galvanized at the same time. That 20' structure weighs
>> closer
>> >>to 300lbs.
>> >>
>> >>So galvanizing all these will add about $500 to the project. Have any
>> of
>> >>you had your items galvanized, or do you think it's a waste of money
>> >>and
>> >>painting is "just" as good.
>> >>
>> >>Thanks,
>> >>Art, KC2G
>> >>_______________________________________________
>> >>
>> >>
>> >>
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>> >
>> > _______________________________________________
>> >
>> >
>> >
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>> _______________________________________________
>>
>>
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>
>
>
> --
> ------
> N9LJX
> radio.n9ljx@gmail.com
> http://web.ics.purdue.edu/~scott/
> _______________________________________________
>
>
>
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