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8-2.
MOBILE INSTALLATION
HINTS
8-2-1.
Noise Reduction
In motor vehicles, noise is generated by mainly the ignition
system.
Other
sources
of noise
include
the
wiper
and
heater motors.
It is imperative that some preventive measures be taken to
reduce the noise to the lowest possible level.
(a) Antenna location selection
Since
ignition
noise
is generated
by the
vehicles
engine, the antenna must be installed as far from the
engine as possible.
(b)
Bonding
The component
parts of motor vehicles, such as the
engine,
transmission,
muffler
system,
accelerator,
etc., are coupled to one another at DC and low fre-
quencies, but are isolated at high frequencies. By con-
necting
these
parts
using
heavy,
braided
ground
straps, ignition noise can be reduced. This connection
is called ''bonding''.
(c)
Use
ignition
suppressor
cable
or
suppressor
spark
plugs
Noise can be reduced by using spark plugs with inter-
nal resistors, or resistive suppressor ignition cable.
8-2-2.
Battery capacity
tery and an alternator (which generates power while the
engine is running) to supply current to the various loads or
to charge the battery.
Since the transceiver draws high current during transmit,
maintenance:
(c)
If necessary,
use an ammeter
and/or a voltmeter to
monitor battery condition.
39
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