Antenna; Antenna Type; Antenna Placement; Possible Communication Disturbances - Wavecom CM52 Integrator's Manual

5.4

Antenna

Antenna Type

5.4.1
When choosing an antenna for your application you must consider the following requirements:
The antenna must be designed for the AMPS/CDMA 800 and CDMA 1900 MHz frequency band
(dual band) for the CM52.
The impedance of the antenna and antenna cable must be 50 Ω.
The VSWR value should be less than 2:1.

Antenna Placement

5.4.2
Always follow the instructions supplied by the antenna manufacturer.
You should place the antenna away from electronic devices or other antennas. The recommended
minimum distance between adjacent antennas operating in a similar radio frequency band is at
least 50 centimeters.
If the Wireless CPU
centimeters must be maintained between the radiating antenna and the user or nearby persons. In
this mode of operation, the combined connection cable path loss and antenna gain must be no
greater than 1 dBi.
5.5

Possible Communication Disturbances

Noise can be caused by electronic devices and radio transmitters.
Free Space Path-loss occurs as the strength of the received signal steadily decreases with the
distance from the transmitter.
Shadowing is a form of environmental attenuation of radio signals that is caused by hills,
buildings, trees or even vehicles. Inside buildings this can cause problems, especially if the walls
are thick and reinforced.
Multi-path fading is a sudden decrease or increase in the signal strength. This is the result of
interference caused when direct and reflected signals reach the mobile phone simultaneously. Flat
surfaces such as buildings, streets, vehicles, etc, can reflect signals.
CM52 Integrators' Manual
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Page 51 of 53
is used in the Class I AMPS mode, a separation distance of at least 23
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CM52 Integrators' Manual