Motorola WAVE TLK 150 Guia De Instalacion página 34

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Chapter 6: Best Practices: Installation & Troubleshooting
Chapter 6
Best Practices: Installation &
Troubleshooting
In this section are Motorola Solutions recommended vehicle installation practices that can address or
prevent many issues, including:
• Radio circuit damage due to over voltage condition
• Radio/Accessories "lock up"
• Radio/Accessories change state/lock-up when radio PTT is depressed
• Radio intermittently resets
• Alternator whine present when transmitting with engine running
• Radio/Accessories turn themselves on/off
• Radio sending false emergency alerts at vehicle cranking or during battery maintenance
6.1
Check Wiring of Ignition and Radio Ignition Sensing
• If it is required to turn the radio on and off through the ignition sense switch, in addition to the
control head on/off switch, connect the ignition sense lead to the accessory terminal from the
ignition switch (usually in the vehicle fuse panel under accessory or radio).
6.2
Check Physical Installation of Radio Ground and Radio
Accessory Wiring
• Verify that the red A+ lead is connected directly to the positive terminal of the battery and the black
ground lead is connected to the vehicle chassis using a wire with practical length.
• For vehicles that have other types of electronic equipment installed such as lights, flashers,
computers siren, PA, and others, use a separate ground for the mobile radio equipment.
• Make sure that the LTE antenna is the minimum required distance (15 cm) from the mobile radio
equipment for good coexistence performance between LTE and WiFi transceivers.
• 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.
• Do not coil up any excessive length of antenna cable, if possible. It may affect the radio receive
performance.
6.3
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).
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