
9. ADDI TIONAL GENERAL I NFORMATION
9.1 ELECTRICAL TRANSIENTS AND RADIO FREQUENCY INTERFERENCE
Electronic circuits are used in WH Models to perform a number of functions associated with electronic
cruise control, electronic engine and transmission control systems etc. These circuits can be damaged or
malfunction as a result of electrical transients or excessive radio frequency (RF) radiation.
ELECTRICAL TRANSIENTS
Electrical transients are high voltage spikes, produced by the sudden switching or interruption of electric
currents. Older style timing lights and battery chargers can produce serious transients, hence, it is
important to use only good quality equipment suitable for use with electronic systems.
It is also good practice to ensure that the battery is disconnected before using a battery charger.
Indiscriminate fitting of solenoids, indicators or relays can also cause transients.
RADIO FREQUENCY INTERFERENCE
One of the chief sources of RF interference is the ignition system. Other sources include CB radio and
radio telephones. The following are normally used to suppress RF interference.
Resistors eg. High Tension Cables and Connectors.
Capacitors and Choke Coils.
Metal Braid for screening leads or suppression covers made from conductive material for screening
equipment.
To prevent damage to equipment:
Do not replace interference suppressed high tension ignition cables or connectors with unsuppressed
types.
Do not remove or reposition interference suppression filters or capacitors.
Figure 0A-14
Legend
1. Music.
2. Core.
3. Braid.
4. Body.
5. Antenna cable.
6. Internal Interference.
7. Signal from station.
8. External interference.