76 | MTM5400 Mobile Terminal Installation Manual | INSTALLATION |
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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.
Table 18 Rated Power and Distance
Mobile Radio Rated Power | Minimum Lateral Distance |
(see Note below) | from Vehicle Body |
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Less than 7 Watts | 20 Centimetres (8 inches) |
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7 to 15 Watts | 30 Centimetres (1 Foot) |
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16 to 39 Watts | 60 Centimetres (2 Feet) |
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40 to 110 Watts | 90 Centimetres (3 Feet) |
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If you are not sure of the rated power of your radio, contact your Motorola representative or dealer and supply the radio model number found on the radio model label. If you cannot determine the rated power out, then assure 90 cm (3 feet) separation from the body of the vehicle.
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 centre of a large, flat conductive surface. In almost all vehicles, mounting the antenna in the centre of the roof will satisfy these requirements. A good alternate location is in the centre 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.
It is recommended to mount the antenna outside the vehicle. Also make sure your power cable is not placed with the antenna in parallel. Interference can cause radio to hang.
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.