CTP Systems CTPhone 1900, Applications Manual

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CTPhone 1900 System Planning
Radio Frequency Radiation Characteristics
The following discussion covers some basic considerations regarding the
behavior of radio frequency energy as it affects planning for your CTPhone
Wireless System layout.
CTPhone Base Station Radiation Pattern
The CTPhone Base Station uses an omnidirectional antenna system.
Radio frequency (RF) energy radiates, or propragates, equally in all direc-
tions on a horizontal plane. RF energy behaves like a pebble tossed into
water. When a pebbles hits the water, ripples move outward across the
water’s surface in concentric circles on a horizontal plane (Figure 2-7).
Figure 2-7. Omnidirectional Radiation Pattern
Antenna Polarization
CTPhone Base Stations use vertically polarized antennas. That means the
four retractable antennas should maintain vertical orientation relative to
the earth’s horizon. For example, antennas should be fully extended at a
90° angle in relation to the base station when the unit is ceiling mounted.
Top View
Antenna