Hi Phil -
Just a suggestion you might want to loolk into - Evergreen trees have had a
reputation of having an adverse affect on the operation of verticals. You
might want eo look into it before you become too committed to your proposed
4 square in the midst of many pine trees. This is from what I have read in
the past and also heard. Perhaps others in the group could add to it for
your benifit.
Gene / W2LU
----- Original Message -----
From: "Phil Chambley" <pchambley@gmail.com>
To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Sent: Friday, April 30, 2010 3:46 PM
Subject: [TowerTalk] Adivce Using Irrigation Pipe
> I'm looking for advice on an antenna system I'm planning on putting up
> this
> summer.
>
> While I'd love to have the tree height here to hang a couple of pairs of
> Bobtail Curtains, where I'm at near Helena the pines just don't get the
> water to get the height required. I've been reading back though the
> archives
> and gleamed some very good information on using irrigation pipe as
> verticals.
> What I am planning for 75 is a four square, last summer I cleared some
> trees
> and set some 4x4's in concrete for the bases. I'm planning on using 3 inch
> irrigation aluminum with one 40 foot and a 24 foot piece put together with
> a
> 18 inch or so sleeve of the pipe split enough to allow it to fit inside
> the
> other 2 pieces.
>
> For the bases on the verticals I'll take a piece of 3 inch PVC to slide
> over
> the aluminum and slide reducer bushings into the PVC, drill a hole through
> the bushings for the pivot point in a base built like N6RK shows on his
> website (really nice Information, thanks Rick) to lift it with another 30
> or
> 40 foot piece of pipe for this purpose. The 4x4's are sticking up about 5
> feet so I can attach the verticals at this point in addition to the guys.
>
> Because I have about 10 inches of soil on top of solid sedimentary rock, I
> think I just use 1 inch round steel rod driven into the ground a couple of
> feet as guy anchors. As for the guy points on the verticals, I saw where
> someone had slipped a piece of 3 inch PVC pipe over the tubing and glued a
> plastic toilet flange on the PVC and held the PVC in place with a few
> screws, i thought that was a really good idea too. I don't know how many
> guy
> points 2 or 3 would be enough and where on the verticals I should place
> the
> guys. It will occasionally have to stand up to 70 mph winds or more but
> it's
> in a location where it can't hurt anything if it falls.
>
> I thought about using a 40 foot 3 inch and then a 2 inch piece on top with
> a
> 2 inch PVC pipe slipped over with 2 inch couplings on the PVC pipe ends
> and
> turn those until they just fit inside the 3 inch pipe. Not having access
> to
> a lathe I figured I'd just go with the 3 inch all the way.
>
> When I raise this up do I need to have the guys on the side of it too? I
> know I need to stop it when it's up but if I need to guy it so that the
> guy
> ropes on the side can sweep as it goes up I'll need to cut a lot more
> trees.
> So questions I still have: should I go 3" all the way, 3" to 2" or would
> 2"
> all the way work? Guy points how many and where on the verticals should
> they
> be mounted. Lifting the things without side guys is the possible or is it
> just plain stupid?
>
> Any tips and advice will be greatly appreciated.
>
> Thanks,
>
> Phil Chambley Jr
> KT7J
> ex KJ4NI
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>
>
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