There are several methods like drawing circles, with a radius twice the width
of the tower, from the two other legs (2 and 3). The point, M, where the
circles intersect in front of the first leg (1), is an alignment mark for
anchor point location, accuracy is not as good but it can be improved using a
pipe with its midpoint aligned with the tower side center to draw larger radii
circles with a longer baseline centered on the pipe ends (x). The farther the x
points from the tower, the better the accuracy
I hope that the "Text - cad" does not go kaput on the server :oP
M
1 I I I
I Ix________I______ I________x 2 3
David
HK1A
EC5KXA
ex-HK1KXA
> From: w2lu@rochester.rr.com
> To: towertalk@contesting.com
> Date: Thu, 15 Apr 2010 21:59:58 -0400
> Subject: Re: [TowerTalk] Measuring Guy Positions
>
> Why not just clearly on the mark the mid point of one of the cross braces on
> the inside of the flat side which is next to the house. Then tie a piece of
> rope to the leg that is out away from the house and walk a little ways away
> from the tower, line up the outside leg with the mark on the cross brace,
> pull the rope out to that point and you'll have a line to a future anchor.
> Just continue out that line for whatever distance away you want the anchor
> to be. Then you can take a piece of cardboard and draw a straight line and
> with a protractor draw lines at 30 degrees each side of it. Line up the
> first - middle - line to point to the tower then the other two lines will
> be pointing to your other two anchors . Then a little trig will tell you how
> far out to go along theses two lines. And Voila !, you've got your three
> anchor points.
> The real copout, but good enough for government work, would be to just draw
> it out to scale on a piece of paper.
> Gene / W2LU
>
>
> ------- Original Message -----
> From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
> To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
> Sent: Thursday, April 15, 2010 5:47 PM
> Subject: Re: [TowerTalk] Measuring Guy Positions
>
>
> >
> >
> > Mark Robinson wrote:
> >> I have my new 100 foot Rohn 45 set to go up on the gable end of the
> >> house. I
> >> have a wall bracket at 18 feet tied into the second storey ceiling
> >> joists. I
> >> can remove this wall bracket later if it proves to give me problems and
> >> yes
> >> I will probably never do a wall bracket again.
> >>
> >> I have set the rear guy back 108 feet at right angles to the gable end of
> >> the house. Using string to layout right angle triangles and a triangle
> >> with
> >> 30 and 60 degrees and a hypotenuse of 97 feet, I have marked the postions
> >> of
> >> the other 2 guys set 120 degrees from the rear guy line. Since the guys
> >> stradle the house and I have trees and a pump house I cannot see any guy
> >> anchor postion from any of the other guy anchor location . When I get the
> >> tower up to 30 or 40 feet then I will be able to see all three guy anchor
> >> points from the tower vantage point. I would like to check the 120 degree
> >> spacing of the guys at that time before digging any anchor holes. What is
> >> the easiest way to measure the angle between the 3 marked guy anchor
> >> postions from my vantage point on the tower.
> >>
> > T-Square against the back side of the tower with the extension against
> > the the leg in the direction of the guy anchor. Sight down the edge of
> > the extension to the anchor.
> >
> > It may be crude, but it'll give you well within the acceptable accuracy.
> >
> > 73
> >
> > Roger (K8RI)
> >> thanks Mark N1UK
> >>
> >> _______________________________________________
> >>
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> >>
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