22 Installing the Radio TM9100 Mobiles: 110 W Mobile Installation Guide
© Tait Electronics Limited October 2005
4.10 Checking the Installation
Warning!! Danger of fire. The radio’s protection mechanisms rely
on the correct fuses on both the negative and positive
power supply leads being present. Failure to fit the
correct fuses may result in fire or damage to the radio.
Make sure that you use 30 A fuses. For part numbers,
refer to “Checking the Equipment for Completeness”
on page 10.
1. Insert the fuses into the power leads.
2. Turn the ignition on. If necessary, switch on the radio at the control
head.
3. Confirm that it is operational, but do not transmit.
4. Connect an in-line power meter between the radio and the antenna.
5. Transmit and measure the forward and reflected power levels.
The antenna system should achieve a VSWR of better than 2:1. If
VSWR is poor (3:1 or worse), the External RF Amplifier will reduce
its RF power output.
6. If the VSWR is not better than 2:1, check the installation. If
necessary, start reducing the length of the antenna in steps of 0.1
inches to 0.2 inches (2 to 5 mm). Measure the power levels at each
step. For wide-band use, tune for best performance at the top of the
band.
Important Some antennas are pre-tuned and must not be cut. Check
with the manufacturers’ instructions.
7. Once the VSWR is within tolerance, make a call to another party on
the radio.
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