User's Guide

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10
Planning
The easiest way to calculate the straight-line separation between antennas is to break it down into
three simple measurements and then use some basic geometry to nd the distance, as follows:
1. Measure the distances ab, bc, and cd as shown in the diagram on the next page.
- Distance from the nearest interior antenna (Point a) to the wall underneath the exterior antenna
(Point b). This is distance ab.
- Distance from Point b to directly underneath the exterior antenna. This is Point (c). This is distance
bc.
- Distance from Point c to the exterior antenna (Point d). This is distance cd.
2. Multiply ab times ab to obtain ab
2
.
3. Multiply bc times bc to obtain bc
2
.
4. Multiply cd times cd to obtain cd
2
.
5. Add ab
2
+bc
2
to obtain ac
2
.
6. Add ac
2
+cd
2
to obtain ad
2
.
7. The straight-line distance ad is the square root (√) key. of the result obtained in Step 6.
Note: Most calculators have a square root key.
Example:
• Distance ab=40 feet; ab
2
= 40x40=1600.
• Distance bc=10 feet; bc
2
= 10x10=100.
• Distance cd=20 feet; cd
2
= 20x20=400. ac
2
= 1600+100=1700
• ad
2
= 1700+400=2100
• ad = 45.83’
Here, the straight-line distance ad is just under 46 feet, which is compatible with 50dB booster gain
as indicated in the previous table.