Conducted Noise; Induced Noise - Vertex Standard VXD series Installation Manual

Chapter 2 Reducing Noise Interference
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
Alternator or
Generator

2.1.3 Conducted Noise

Conducted noise enters the radio through the points where the radio is attached to the vehicle's electri-
cal 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 alter-
nators, generators, voltage regulators, or weak batteries). Conducted noise can degrade both transmit
and receive performance of a mobile radio.

2.1.4 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. Communication is degraded simply because the wiring provides a transformertype
coupling action without any actual physical connection. Induced noise can degrade both transmit and
receive performance of a mobile radio.
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Inadequate Terminal
or Fuse Block Filtering
Electric Fuel Pump
Distributor
Voltage
Regulator
Figure 2-1 Noise Sources
Windshield Wiper Motor
Heater Air Conditioner Blowe
Electric Windows Motors
Hood Static
Power Seat Motor
Ignition
Coil
Spark Plug
Wires
Spark Plugs
Idle Stop
Solenoid