Roger (K8RI) wrote:
<<Plumb bobs are pretty much useless except indoors or over very short
distances.>>
Yes, I agree. I suppose a heavy bob hung from thin line and immersed in
a pail of water for dampening would get you close enough for a short
tower, or a heavily guyed one, but I think it would be my last choice.
<<A laser level would be lucky to be pushing the limits of acceptable
accuracy
> while an optical one would do much better.>>
Actually, I own a rather expensive PLS 5-beam laser rated at 1/8 inch
accuracy at 100 feet that I could have used, but that would have
required finding the center of the tower in two places.
<<My digital level just requires going into set up, measuing one direction
(doesn't even have to be level), puching a button, turning the level 180
degrees and punching the button again. It electronically takes the
difference and calculates level.>>
The Wixey can be zeroed to a known surface (horizontal or otherwise) as
well. What I meant by absolute accuracy is that I have no way of
knowing the accuracy of a particular reading, i.e., if it says 67.3
degrees is it really 67.3 degrees. I only know that it is very
repeatable, and as you say, for aligning a tower that is all that is
required.
<<Going for "tall" you need actual angle and
not just repeatability.>>
Why (assuming you have multiple sides to check)? Not sure what you mean
here.
73,
Dave AB7E
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