Installation Guide

• Make sure that the mobile radio antenna is the minimum required distance (three feet) from the
mobile radio equipment to prevent radio frequency interference (RFI) from interfering with the radio
and/or accessories.
• Do not coil up any excess length of the red A+ lead. This action may cause a large transient voltage
to be produced when there is a high current drain for example, during transmit. Thus, could cause
the radio to reset when the push-to-talk (PTT) is depressed.
• Do not coil up any excessive length of antenna cable, if possible. It may affect the radio receive
performance.
4.3
Improving the Electrical Quality of the Power and Ignition Lines
Procedure:
1 Use a relay to isolate the vehicle ignition switch point (ACC) from the radio ignition sense point.
Control this relay from the vehicle ignition switch point (ACC). Supply a cleaner voltage from the
positive terminal of the battery into the relay, which is attached to the radio ignition sense point.
Now the ACC line toggles the relay, instead of directly toggling the radio ignition sense line.
2 Install a Power Line Filter between the A+ lead and the positive terminal of the battery. This is
intended to filter the battery power applied to the transmitter power amplifiers. Pay extra caution
to this because the series filter introduces a negative spike when the radio transmits that may
cause problems with radio operation.
3 For vehicles that use electromechanical relays to control external devices (lights, motors, switch
boxes and others), these relay circuits should be isolated as best as possible from the mobile
radio equipment. Diode suppression should be used across the relay contacts to minimize the
noise produced by the collapsing magnetic field.
4 If the ignition sense switch is to be used, make sure that there is not a large voltage drop
between the A+ point (usually the positive terminal of the battery) and the ignition sense point. In
general, the voltage difference between these two points, should not be greater than 1.5 volts
when all accessories/air-conditioner, others are turned on. Refer to the Basic Service Manual for
specifications for minimum and maximum voltage levels. Typical battery voltage levels are 13.6
V +/- 20%.
4.4
Jump-Start the Vehicle
Prerequisites:
CAUTION: Do not jump-start vehicle with radio power or ignition sense cables connected.
Damage to the radio and/or accessories may result.
The state of your radio prior to needing a jump-start may be unknown, and the radio may
attempt to return to its last state (radio ON), when doing a jump-start. Therefore, Motorola
Solutions recommends the following steps be taken before jump-starting any vehicle containing
a radio.
Procedure:
1 Locate the ignition sense line and the main power leads (thick red wire) near the battery positive
terminal.
NOTICE: These lines are fused. In the event these lines are not fused (add the
appropriate fuse in line) use whatever tools necessary to physically disconnect the
ignition sense and power lines from the battery terminal.
2 Open up the fuse holders and remove the fuses out of the kits.
6880309T23-FB
Chapter 4: Best Practices: Installation & Troubleshooting
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