Motorola GM1200E Installationshandbuch - Seite 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