Motorola Gm300 Installation Manual

							Professional Radio
GM Series
Radio Installation Manual
68P64112B30
Issue: July 2000 
						

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Computer Software Copyrights
The Motorola products described in this manual may include copyrighted Motorola computer programs stored
in semiconductor memories or other media. Laws in the United States and other countries preserve for
Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or
reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer
programs contained in the Motorola products described in this manual may not be copied or reproduced in
any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola
products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license
under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive
royalty-free license to use that arises by operation of law in the sale of a product. 
						

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SAFETY INFORMATION
Read this information before using your radio.
SAFE AND EFFICIENT OPERATION OF MOTOROLA TWO-WAY RADIOS
This document provides information and instructions for the safe and efficient operation of Motorola
Portable and Mobile Two-Way Radios. The information provided in this document supersedes the
general safety information contained in user guides published prior to 1 January 1998.
For information regarding radio use in hazardous areas, please refer to the Factory Mutual (FM)
approval manual supplement.
EXPOSURE TO RADIO FREQUENCY ENERGY
Your Motorola Two-Way Radio, which generates and radiates radio frequency (RF) electromagnetic
energy (EME), is designed to comply with the following National and International Standards and
Guidelines regarding exposure of human beings to radio frequency electromagnetic energy:

Federal Communications Commission Report and Order No. FCC 96-326 (August 1996)

American National Standards Institute (C95.1 - 1992)

National Council on Radiation Protection and Measurements (NCRP-1986)

International Commission on Non-Ionizing Radiation Protection (ICNRP- 1986)

European Committee for Electrotechnical Standardization (CENELEC):
To assure optimal radio performance and to ensure that your exposure to radio frequency
electromagnetic energy is within the guidelines in the above standards, always adhere to the following
procedures:
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, transmitonlywhen 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.
ENV 50166-1 1995 E Human exposure to electromagnetic fields Low
frequency (0 Hz to 10 kHz)
ENV 50166-2 1995 E Human exposure to electromagnetic fields High
frequency (10 kHz to 300 GHz)
Proceedings of SC211/B 1996 “Safety Considerations for Human Exposure to EMFs from
Mobile Telecommunication Equipment (MTE) in the Fre-
quency Range 30MHz - 6 GHz.” (EMF - Electro-Magnetic
Fields)
Table 1 Rated Power and Distance
Rated Power of Vehicle-Installed
Mobile Two-Way RadioMinimum Distance from
Transmitting Antenna
7to15Watts30.5 Centimetres (1 Foot)
16 to 50 Watts 61 Centimetres (2 Feet)
More than 50 Watts91.5 Centimetres (3 Feet) 
						

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Mobile Antenna Installation
Install the vehicle antennaexter nalto the vehicle and in accordance with:
a. The requirements of the antenna manufacturer/supplier
b. Instructions in the radio installation manual.
Control Station Operation
When radio equipment is used to operate as a control station, it is important that the antenna be
installed outside the building and away from places where people may be in close proximity.
INSTALLATION WARNINGS
For vehicles with electronic anti-lock/anti-skid brakes, Motorola recommends the following radio
installation precautions and vehicle braking system test procedures to ensure that the radio, when
transmitting, does not interfere with the operation of the vehicle braking system. Refer to your vehicle
service manual for details of your vehicle’s braking system, or contact your dealer directly.
Installation Precautions:
1.Always provide as much distance as possible between the braking modulator unit and the radio,
the radio antenna, and associated transmission line. Before installing the radio, determine the
location of the braking modulator unit in the vehicle. Depending on the make and model of the
vehicle, the braking modulator unit may be located in the trunk, under the dashboard, in the
engine compartment, or in some other cargo area. If you cannot determine the location of the
braking modulator unit, refer to the vehicle service manual or contact a dealer for the particular
make of the vehicle.
2.If the braking modular unit is located on the left side of the vehicle, install the radio on the right
side of the vehicle, and conversely.
3.Route all radio wiring, including the antenna transmission line, as far away as possible from the
braking modular unit and associated braking system wiring.
4.Never activate the radio transmitter while the vehicle is in motion and the vehicle trunk lid is open.
Braking System Tests:
Be sure the following vehicle testing is done in an isolated area. The following procedure checks for
the most common types of interference that may be caused by a radio transmitter to vehicle braking
system:
1.Run the vehicle engine at idle speed and set the vehicle transmission selector to PARK. Release
the brake pedal completely and key the radio transmitter. While NOT speaking into the
microphone, verify that there are no unusual effects (visual or audible) to the vehicle lights, or
other electrical equipment and accessories.
2.Repeat Step 1, except do so while speaking into the microphone.
3.Press the vehicle brake pedal slightly; just enough to illuminate the vehicle brake light(s). Then
repeat Steps 1 and 2.
4.Press the vehicle brake pedal firmly and repeat Steps 1 and 2. NOTE
Refer to Table 1 for rated power and minimum distance values for transmitting
antennas.
WARNING: Disruption of the anti-skid/anti-lock braking system by the radio transmitter may
result in unexpected vehicle motion.
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5.Ensure that there is a minimum of two vehicle lengths between the front of the vehicle and any
object in the vehicle’s forward path. Then, set the vehicle transmission selector to DRIVE. Press
the brake pedal just far enough to stop the vehicle motion completely. Key the radio transmitter.
Verify that the vehicle does not start to move while NOT speaking into the microphone.
6.Repeat Step 5, except do so while speaking into the microphone.
7.Release the brake pedal completely and accelerate the vehicle to a speed between 25 and 40
kilometres (15 and 25 miles) per hour. Ensure that a minimum of two vehicle lengths is
maintained between the front of the vehicle and any object in the vehicle’s forward path. Have
another person key the radio transmitter, and verify that the vehicle can be braked normally to a
moderate stop while NOT speaking into the microphone.
8.Repeat Step 7, except do so while speaking into the microphone.
9.Release the brake pedal completely and accelerate the vehicle to a speed of 30 kilometres
(20 miles) per hour. Ensure that a minimum of two vehicle lengths is maintained between the front
of the vehicle and any object in the vehicle’s forward path. Have another person key the radio
transmitter, and verify that the vehicle can be braked properly to a sudden (panic) stop while NOT
speaking into the microphone.
10.Repeat Step 9, except do so while speaking into the microphone.
11.Repeat Steps 9 and 10, except use a vehicle speed of 50 kilometres (30 miles) per hour.
OPERATIONAL WARNINGS
Potentially explosive atmospheres
Blasting caps and areas
WARNING: For radios installed in vehicles fuelled by liquefied petroleum gas, refer to the
(U. S.) National Fire Protection Association standard, NFPA 58, for storage, handling, and/or
container information
WARNING: Turn off your Two-Way radio when you are in any area with a potentially explosive
atmosphere, unless it is a radio type especially qualified for use in such areas (e.g. FM or
Cenelec approved). Sparks in a potentially explosive atmosphere can cause an explosion or
fire resulting in bodily injury or even death.
WARNING:To avoid possible interference with blasting operations, turn off your radio when you are
near electrical blasting caps. In a “blasting area” or in areas posted “turn off two-way radio”, obey all
signs and instructions.
NOTEThe areas with potentially explosive atmospheres referred to above include fuelling areas
such as: below decks on boats; fuel or chemical transfer or storage facilities; areas where
the air contains chemicals or particles, such as grain, dust or metal powders; and any other
area where you would normally be advised to turn off your vehicle engine. Areas with
potentially explosive atmospheres are often but not always posted.
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Ta b l e o f C o n t e n t s
SAFETY INFORMATION ....................................................................................... iii
Chapter 1 INSTALLATION
1.0 Introduction .......................................................................................................... 1-1
1.1 General Information ....................................................................................... 1-1
1.2 Plan the Installation ........................................................................................ 1-1
2.0 DC Power Cable Installation................................................................................ 1-1
2.1 Planning the Power Cable Installation ........................................................... 1-1
2.2 Power Cable Installation Procedure ............................................................... 1-2
3.0 Trunnion Installation ............................................................................................ 1-4
3.1 Planning the Mounting Trunnion Installation .................................................. 1-4
3.2 Trunnion Installation Procedure ..................................................................... 1-4
3.3 Control Head Mounting Position .................................................................... 1-5
4.0 Antenna Installation ............................................................................................. 1-5
4.1 Mobile Radio Operation and EME Exposure ................................................. 1-5
4.2 Selecting an Antenna Site .............................................................................. 1-6
4.3 Antenna Installation Procedure ...................................................................... 1-6
4.4 Completing the Installation ............................................................................. 1-7
5.0 Installation Options .............................................................................................. 1-9
5.1 Radio Mounting in Dashboard........................................................................ 1-9
5.2 External Speaker Installation ....................................................................... 1-10
5.3 Remote Control Head Installation ................................................................ 1-11
6.0 Accessory Connections ..................................................................................... 1-13
6.1 Accessory Connector Pin Functions ............................................................ 1-13
Chapter 2 REDUCING NOISE INTERFERENCE
1.0 Introduction .......................................................................................................... 2-1
1.1 Noise Sources ................................................................................................ 2-1
1.2 Radiated Noise............................................................................................... 2-1
1.3 Conducted Noise............................................................................................ 2-2
1.4 Induced Noise ................................................................................................ 2-3
2.0 Operation of a Conventional Ignition System ...................................................... 2-3
2.1 Introduction .................................................................................................... 2-3
2.2 Sources of Ignition Interference ..................................................................... 2-3
3.0 Detection of Noise Sources ................................................................................. 2-5
3.1 Noise Detection Procedure ............................................................................ 2-5
3.2 Sources of Noise ............................................................................................ 2-7
4.0 Noise Reduction Techniques............................................................................... 2-7
4.1 General .......................................................................................................... 2-7
4.2 Ignition System Interference .......................................................................... 2-8
4.3 Alternator/Generator Whine ........................................................................... 2-9 
						

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4.4 Voltage Regulator Noise ...............................................................................2-11
4.5 Hood and Trunk Lid Noise ............................................................................2-11
4.6 Other Electrical Noises .................................................................................2-12
4.7 Wheel Static..................................................................................................2-12
4.8 Ground Bonding............................................................................................2-12 
						

							Chapter 1
INSTALLATION
1.0 Introduction
1.1 General Information
There are two methods of installing your mobile radio:
1.Using the direct mounting trunnion and power cables supplied with a standard radio package.
2.Mounted in the car radio cut-out (using the required GLN7320_ mounting kit, per ISO7736).
An accessory connector on the rear of the radio (see Figure 1-4 Connections to the Back of Radio)
enables you to attach different accessories required for the installation.
A ten-pin telephone type connector on the front control head panel (see Figure 1-5 Transmission
Hump Mounting (Top) and Below Dash Mounting (Bottom)) provides for the connection of various
types of microphones.
1.2 Plan the Installation
1.Mount the radio horizontally near the driver, so the driver can easily view, access and operate
the controls and accessories.
2.Ensure that the location is not exposed to dirt and moisture.
3.Verify that there will be sufficient space around the mobile unit for air flow and installation.
4.Check that there is enough routing space for the power cable connector and the antenna
coaxial cable.
5.Plan the best place to run connections to minimize pinching, crushing, and overheating of
wires and cables.
2.0 DC Power Cable Installation
2.1 Planning the Power Cable Installation
The 3 metres (10 feet) DC power cable shipped with the radio should be long enough to be installed
in most vehicles. Take the following precautions before you begin:

Whenever possible, avoid routing the cable above the catalytic converter.

Use grommets whenever a cable has to pass through a hole in a metal panel. NOTE
In a vehicle with an airbag, make sure that the mounting location of the mobile radio, or of
any radio accessory, is not in the deployment path of the air bag.
CAUTION: This radio must be operated only in negative ground electrical systems.
Operating the radio on a positive ground system will cause the cable fuse to short-circuit.
Check the vehicle ground polarity before you begin the installation.
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							1-2INSTALLATION
The following table lists power cables available for this radio:
2.2 Power Cable Installation Procedure
Begin the power cable installation as follows:
1.Determine a routing plan, keeping in mind where the radio is to be mounted.
2.Locate an existing hole with grommet in the vehicle fire wall, or use a 9.5 mm (3/8-inch) bit to
drill an access hole in the fire wall. Install a grommet with a 5 mm (3/16-inch) inside diameter
into the hole to protect the power cable.
3.From inside the vehicle, feed the red and black leads (without the lugs attached) through the
access hole and into the engine compartment. (See Figure 1-1 Power Cable Routing into the
Engine Compartment)Ta b l e 1 - 1Power Ca bles
Number Description Rating
HKN4137_Low power cable to batter y1-25W; 15A fuse; 14 AWG 3m
HKN4191_ High Power Cable to battery 25-45W; 20A fuse; 12 AWG 3m
CAUTION: Improper handling with the power cable may cause shorting to ground. Ensure
that during radio installation the power cable fuse is removed.
CAUTION: Be very careful not to damage existing wires.
Figure 1-1Power Cable Routing into the Engine Compartment
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Black Lead
Red LeadFirewall
Grommet
Engine Compartment To Radio
FL0830246-OFL0830246-O