5
Antenna Location
The template shows an imaginary circle around an antenna. The spokes on
the template represent imaginary straight lines measured from the centre of
the circle to 36 points spaced equally around the circle. Each straight line is
25 feet in length. The numbers on the template (1–5) are a guide to show you
where to mark the field strength level the meter displays as you measure.
Hint: To help measure a circular path around the antenna, tie a slip knot in a
25-foot piece of rope or strong cord, slide the knot loosely around your
antenna, then use the rope as a guide as you walk around the antenna.
Follow these steps to prepare the antenna site.
·
Starting at the antenna, use a compass to find due north. Then walk
due north and stop about 15 to 25 feet away from the antenna.
·
Use an object such as a rock or a weighted piece of paper to mark
where you are standing.
·
Walk around the antenna in a circle, using more objects to mark 35
more evenly spaced marks on the path.
Hint: You can quickly find the space to leave between each mark by using a
calculator. Measure the diameter of the marked circle (from one side of the
circle to the other). Then, divide the diameter by 11.46.
For example, for a 50-foot diameter circle:
50 feet
= 4.363 Feet
11.46
So, you would place a mark every 4.363 feet (4 feet, 3 inches).
CALIBRATING THE METER/ MEASURING FIELD STRENGTH