TM9100 Installation Guide
Installing the Radio
27
© Tait Electronics Limited
August 2005
2.10
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.
The 40 W/50W radios use 20 A fuses; the 25W radios
use 10A fuses. For part numbers of the fuses, refer to
“Checking the Equipment for Completeness” on
page 11
.
1.
Insert the fuses into the power leads.
2.
Switch on the radio to confirm that it is operational, but do
not transmit.
3.
Connect an in-line power meter between the radio and the antenna.
4.
Transmit and measure the forward and reflected power levels.
Less than 4% of the forward power should be reflected. If this is not
achieved, check the installation, including the antenna length.
5.
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.
Important
Some antennas are pre-tuned and must not be cut. Check
with the manufacturers’ instructions.
6.
Once the reflected power levels are within tolerance, make a call to
another party on the radio.