System Installation; Ground Connection; Cabling; Coaxial Cable - Icom AH-740 Instruction Manual

■ Ground connection

It is absolutely essential that the antenna is connected to
an effective and stabile RF GROUND POINT— the vehicle
chassis. It is further recommended that body panels are also
bonded to the vehicle chassis. Make sure all contact points
are free of paint and ground to a shiny finish and protected
from rusting with conductive grease, before bolting the
mounting stud and ground strap terminals.

■ Cabling

A coaxial cable and a control cable are supplied with the
tuning antenna. A ground strap is provided on the base of
the tuning antenna to ensure a reliable connection with the
vehicle's metalwork. Connect the ground strap to both the
chassis frame or the body metalwork, whenever possible.
Avoid feeding the antenna cables together with the engine
ignition cabling routes. Use a One-Point (Star) Station
Ground for the entire HF system where your transceiver is
installed. Feed both (B+ and B–) thick wires from the vehicle
battery to the transceiver location. Do not use the vehicle's
metalwork as a replacement of the B– wire.
Use suitable noise filters for alternators. Ask your dealer for
details.

SYSTEM INSTALLATION

■ Coaxial cable

Insulate the lead-in cable of the AH-740 antenna terminal
and antenna element from other metal objects. To prevent
interference, keep cables as far as possible from other
antennas and electronic equipment.

■ About mounting base

A mounting base for the AH-740 installation must be locally
prepared.
Select or fabricate a strong metal bracket for the antenna
plate, about 8–10 mm (0.31–0.39 inches) thick, and weld or
bolt it firmly to the vehicle chassis or other strong structure.
Ask your technical dealer or installer for suitable mounting
base details.
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