[TowerTalk] Locating Tower Guy Points

[Jim White, K4OJ]

....assuming you have a flat qth terrain wise...

In addition to the three guy points being the same distance out from the 
tower, they are also the same distance apart - i.e. the distance from 
guy point a to guy point b is the same as the distance from a to c... 
and all around... b=c etc...

IF you can site the first two but have something like a shed or house in 
the way of the third perhaps you can use this knowledge to work 
backwards to find the third guy point.

In the event you have a complex set of obstacles in your yard you may 
wish to do some scale drawings... before you throw out that Decmeber 
2003 blotter page - the back side of it makes a nice large piece of 
paper to work on...  while it will not be as exact as actually measuring 
point to point if done with attention to detail it will porbably work 
for you.

GL - Season's

Jim, K4OJ





Bob Gates wrote:

> I'm perplexed.  And for those who know me, just shut up.  Am in the planning
> stages of installing a "really big tower".  At least it's larger than anything
> else I've put up.  The question is, how do you locate the positions of the guy
> wire base points when they are not on a direct line of sight with the tower
> base?
> 
> For example, say I want to install 100' of Rohn 45/55.  These towers require
> fairly large anchor rod foundations.  Something in the neighborhood of 3'x3'x4'
> and 6' deep.  Exact size is not an issue, but one would hopefully be able to dig
> the holes and pour the concrete/rebar at the same time you pour the tower
> foundation.  But suppose one or more of the anchor points is on the other side
> of a structure, say a house.  You can sort of approximate the distance from the
> tower by knowing the length of the guy wire and calculating the angle of the
> dangle with a temporary pole.  But the angle from the tower can't be seen.  And
> they need to be 120 degrees apart.
> 
> The only thing I can figure so far is to put in the tower foundation, wait a
> week or two, install 30' or so of tower, add some temporary guys, and then
> visually align where the anchor bolts need to be.  Then have the contractor come
> back out and excavate/fabricate and install the anchor bolt foundations.  Then
> wait a week or two before installing the permanent guys and erecting the rest of
> the tower.  Obviously you would want to do all of this in one trip vs. two, but
> I can't for the life of me figure out how.
> 
> Any advise from the experts would be most appreciated.
> 
> Bob,  KG7KW
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