CHAPTER 3: Planning
Copyright 2011 Cellphone-Mate, Inc. All rights reserved.
11
The easiest way to calculate the straight-line sepa-
ration between antennas is to break it down into
three simple measurements and then use some
basic geometry to find 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 exte-
rior antenna (Point b). This is distance ab.
Note: Vertical separation is more impor-
tant than horizontal separation. If you
are unable to obtain the required sepa-
ration horizontally, try raising the exte-
rior antenna. You may also try reducing
the amplifier gain as described in Chap-
ter 5 of this manual.
- Distance from Point b to directly under-
neath 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
.
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