INSTALLATION
T6M SERIES MOBILE SERVICE MANUAL – SM/16/1.0
Page 4-8
1. Place the directional power or VSWR meter in series with the antenna
feed. A Peak Envelope Power meter should be used.
2. Start the vehicle and allow to idle for 1 minute to ensure that the battery
voltage is at the correct level for testing.
3. Switch on the mobile radio using the on/off selector/switch, or switch on
ignition if ignition sensing is utilized, and check that the LED’s and
display function and that the startup warble is heard.
4. Select a suitable channel that can be used for test purposes and press
the PTT to cause the mobile to transmit. Measure the PEP and VSWR.
5. PEP should be between 7 and 30 Watts, dependent on modulation, and
VSWR less than 1.5:1.
6. Carry out a functional check by setting up a voice call. Check that the
received noise is acceptable. If not it will be necessary to carry out
suppression of the vehicle electrical system
7. It is important to check that the mobile radio does not affect the
operation of any vehicle systems such as lights, electronic ignition,
engine management system and anti-lock brakes. Other electronic
devices fitted to the vehicle, such as radio/cassette player or cellular
telephone, should also be checked. Check that these systems still
operate correctly when the mobile radio is transmitting.
8. If the mobile radio does not function correctly refer to the fault-finding
section in this chapter or fit another unit.
9. A vehicle installation report should be completed. An example is
provided at the end of this manual.
4.8 Troubleshooting Flow Chart - General Operation
If the mobile radio does not pass the serviceability check, the installation troubleshooting flow
chart (see Figure 4-5 )
For reference:
SPU : Signal Processing Unit (PCB)
EXP : Expander card (PCB)
RFU : Radio Frequency Unit (PCB)
FPU : Front Panel Unit (PCB)
PA
: Power Amplifier (PCB)
