Motorola WAVE Mobile TLK 150 Mode D'emploi page 37

4.3
Improving the Electrical Quality of the Power and Ignition Lines
Procedure:
1 To use a relay to isolate the vehicle ignition switch point (ACC) from the radio ignition sense
point. Perform the following actions:
a Control this relay from the vehicle ignition switch point (ACC).
b Supply a cleaner voltage from the positive terminal of the battery into the relay, which is
attached to the radio ignition sense point.
c Toggle the relay from the ACC line, instead of toggling the radio ignition sense line.
2 To install a Power Line Filter between the A+ lead and the positive terminal of the battery.
Perform the following actions:
a Filter the battery power applied to the transmitter power amplifiers.
b 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 such as lights, motors,
switch boxes. Perform the following actions:
a Isolate the relay circuits from the mobile radio equipment.
b Use a Diode suppression across the relay contacts to minimize the noise produced by the
collapsing magnetic field.
4 To use a ignition sense switch. Perform the following actions:
a 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.
b The voltage difference between these two points, should not be greater than 1.5 V when all
accessories or air-conditioner are turned on.
c Refer to the Basic Service Manual for specifications for minimum and maximum voltage
levels.
d 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.
NOTE: 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.
Chapter 4 : Best Practices: Installation & Troubleshooting
MN007262A01-AE
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