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3.4
Installing the Antenna
This section provides information on installing an external antenna within
the RF exposure limits.
Install the external antenna according to the antenna manufacturer's
instructions. Good quality 50 Ω coaxial cable must be used, such as RG58
or UR76.
>25W
25W
1.
Terminating the
Antenna Cable
2.
Figure 3.4
TM8100/TM8200 Installation Guide
© Tait Limited October 2012
Notice Route the cable in a manner that minimizes:
coupling into the electronic control systems of the vehicle
■
coupling of electric vehicle systems, such as alternators, into the
■
radio
Avoid sharp bends in the cable. These distort the cable and alter its
electrical characteristics.
Warning
RF exposure hazard!
To comply with FCC RF exposure limits, mount the antenna at
a location such that no person or persons can come closer than
35 inches (0.9m) to the antenna.
For >25W radios:
VHF radios must be installed using an antenna mounted
■
centrally on the vehicle roof, with a gain of 2.15dBi or
5.15dBi.
UHF and 800MHz radios must be installed using an
■
antenna mounted either centrally on the roof with a gain
of 2.15dBi or 5.65dBi, or centrally mounted on the trunk
with a gain of 5.65dBi.
For 25W radios:
The radio must be installed using an externally mounted
■
antenna with a gain of either 2.15dBi or 5.15dBi.
Run the free end of the coaxial cable to the radio's mounting position
and cut it to length, allowing approximately 8 inches (200mm) excess
at the radio end.
Terminate the free end of the antenna cable with the mini-UHF plug
or BNC plug (supplied) as shown in
Terminating the antenna cable
Figure
3.4.
5/16"
5/32"
(8 mm)
(4 mm)
9/16"
(14 mm)
Installing the Radio
17
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