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Any tricks for determining los? |
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Written by Start a WISP Site Admin
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Monday, 03 October 2005 |
"I need to set up a 11.6 mile link that I'm a little worried about line
of sight or fresnel zone impingement. Point A is a building. Point B,
the proposed sight is a farm on a hill overlooking a village and about
200' higher above Sea Level than Point A. I've have been up in a 90'
bucket truck at point B with a telescope trying to see point A but
couldn't distinguishably make it out. Since Point B is 200' higher
above Sea Level, Point A doesn't stick up over the trees on the horizon
from that vantage point. I'm pretty sure it's there (los) but can't see
it. I can see other references like nearby Water Towers and so forth
but I was just wondering if anyone had any other tricks I could try
other than firing up some radios (which would involve erecting a tower
at point B) and hoping for the best. Thanks in advance"
Anav:
You might consider a point in between that can effectively see both ends, with vertical room to spare.
jebz:
Using a large 12"x12" mirror for a mirror to flash is the best low tech
method to determine line of site. The mirror flashes stand out very
well. Use a close object inline with the target and move the mirror up
and down and across in small zig-zags watching the flash on the close
object.
Andrew J.:
Use a laser pointer and have the guy on the other end looking for the red beam smoke a bunch of cigarettes.
Original thread location
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Site Surveying