Motorola GM1200E Installatiehandleiding - Pagina 26

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Noise Sources
It is impractical to prevent all arcing in the standard vehicle electrical system. In an 8-cylinder engine
running at 2,000 RPM, arcing occurs across the spark plugs at a rate of 8,000 sparks per minute or
133 sparks per second. Electrical motors and generators also produce arcs.
Radiated Noise Pick-up
Antenna Ground
or Location
Electric Fuel Pump
Alternator or
Generator
2.2

Conducted Noise

Conducted noise enters the radio through the points where the radio is attached to the vehicle's
electrical system such as battery cables, ignition switch, chassis ground etc. It can be generated by
electrical transients, electrical motors, poor grounding points, or inadequate electrical system
filtering (from alternators, generators, voltage regulators, or weak batteries). Conducted noise can
degrade both transmit and receive performance of a mobile radio.
2.3

Induced Noise

Induced noise enters the radio through the proximity of radio wiring to other wiring in the vehicle.
Electrical currents through the standard vehicular wiring can induce undesirable noise signals into
the radio cabling (and degrade communication) simply because the wiring provides a transformer-
type coupling action without any actual physical connection. Induced noise can degrade both
transmit and receive performance of a mobile radio.
2-2
Windshield
Inadequate Terminal
Wiper Motor
or Fuse Block Filtering
Wheel Static
Voltage
Distributor
Regulator
Figure 2-1 Noise Sources.
Reducing Noise Interference in Mobile Two-Way Radio Installations
Heater Air Conditioner Blower
Electric Window Motors
Hood Static
Power Seat Motor
Ignition Coil
Spark Plug Wires
Spark Plugs
Idle Stop Solenoid