53SL ES Series Mobile Radio Operating Manual April 2009
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Safety Information
Guidelines
• User awareness instructions should accompany device when transferred to other users.
• Do not use this device if the operational requirements described herein are not met.
Instructions
Transmit no more than the rated duty factor of 50% of the time. To transmit (talk), push
the Push-To-Talk (PTT) button. To receive calls, release the PTT button. Transmitting
50% of the time, or less, is important because this radio generates measurable RF energy
exposure only when transmitting (in terms of measuring for standards compliance).
Transmit only when people outside the vehicle are at least the recommended minimum
lateral distance away, as shown in Table 1, from a properly installed according to
installation instructions, externally-mounted antenna.
Note
The following table lists the recommended minimum lateral distance for bystanders in an
uncontrolled environment from transmitting types of antennas (i.e., monopoles over a
ground plane, or dipoles) at several different ranges of rated radio power for mobile
radios installed in a vehicle.
Mobile Antennas
• Install antennas at the center of the roof or the center of the trunk deck taking into
account the bystander exposure conditions of backseat passengers and the
recommended minimum lateral distances in Table 1. These mobile antenna installation
guidelines are limited to metal body motor vehicles or vehicles with appropriate ground
planes. The antenna installation should additionally be in accordance with:
- The requirements of the antenna manufacturer/supplier.
- Instructions in the Radio Installation Manual, including minimum antenna cable
lengths.
- The installation manual should provide specific information of how to install the
antennas to facilitate recommended operating distances to all potentially exposed
persons.
• Use only EFJohnson Technologies-approved supplied antenna or EFJohnson
Technologies-approved replacement antenna. Unauthorized antennas, modifications, or
Rated Power of Vehicle-Installed
Two-Way Radio
Recommended Minimum Lateral Distance
From Transmitting Antenna
Up to 50 watts
1.0 meter
50-110 watts
1.5 meter
