Motorola TETRA MTM800 Installationshandbuch PDF herunterladen (Seite 77)

INSTALLATION MTM700/MTM800 Mobile Terminal / Installation Manual 77

Vehicle Antenna Installation

Mobile Radio Operation and EME Exposure

To assure optimal radio performance and that human exposure to radio frequency electromagnetic

energy is within the guidelines referenced in this document, transmit only when people inside and

outside the vehicle are at least the minimum distance away from a properly installed, externally-

mounted antenna.The table below lists the minimum distance for several different ranges of rated

radio power.

Selecting an Antenna Site

1. Install the vehicle antenna external to the vehicle and in accordance with:

a. The requirements of the antenna manufacturer/supplier

b. The requirements of the vehicle manufacturer

2. The best mounting location for the antenna is in the center of a large, flat conductive surface.

In almost all vehicles, mounting the antenna in the center of the roof will satisfy these

requirements. A good alternate location is in the center of the trunk lid. If you use the trunk lid,

ensure that the trunk lid is grounded by connecting grounding straps between the trunk lid

and the vehicle chassis.

3. Ensure the antenna cable can be easily routed to the radio. Ensure that the antenna cable is

routed separately and not in parallel to any other vehicle wiring or mobile radio cable wiring.

4. Check the antenna location for any electrical interference according to vehicle manufacturer

requirements

5. Make sure the mobile radio antenna is installed at least 30 centimeters (1 foot) away from any

other antenna on the vehicle..

6. Motorola offers a glass-mount antenna as an accessory. This antenna should be placed as

high as possible on the vehicle. Ensure that a rear-window defogger element does not touch

the inductive “button” on the mounting foot of the antenna.

7. The MTM800 mobile terminal has the option of a GPS board. If a GPS or combined

TETRA/GPS antenna is used, make sure that the antenna has a clear view to the sky and that

the antenna base which carries the GPS receiver is not covered with any metallic or radio

frequency absorbing material.

Table 19 Rated Power and Distance

Rated Power of Vehicle-Installed

Mobile Two-Way Radio

Minimum Lateral Distance

from Transmitting Antenna

Less than 7 Watts 20 Centimeters (8 inches)

7 to 15 Watts 30 Centimeters (1 Foot)

16 to 50 Watts 60 Centimeters (2 Feet)

More than 50 Watts 90 Centimeters (3 Feet)

NOTE Any two metal pieces rubbing against each other (such as seat springs, shift levers,

trunk and hood lids, exhaust pipes, etc.) in close proximity to the antenna can cause

severe receiver interference.

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Motorola TETRA MTM800 Installationshandbuch Seite 77