Radio Frequency Interference (Mobile Stations Only); Table 36: Noise Source And Type - Codan Envoy Reference Manual

Radio frequency interference (mobile stations only)

Types of noise
Engine noise and electrical accessories often cause RF interference.
Noise interference can be:
•
•

Table 36: Noise source and type

Noise from the battery-charging system
Alternator/generator-to-battery wiring
A low-pass filter, such as a Marine Technology type MAR-60A (up to 60 A), should
be fitted to the main battery lead at the alternator to minimise noise. The filter must be
rated for the maximum current available from the charging system. The earth lug of
the filter should attach to the alternator body or the engine block.
E ™ T R
NVOY RANSCEIVER EFERENCE
induced into and carried along the cables to the transceiver
radiated from the noise source and picked up at the antenna
System
Ignition
Battery charging
Other
M
ANUAL
Noise source
Ignition
Alternators
Brakes and bearings
Oil pressure sender
Tachometer
Winches
Wipers and fan motors
I
NSTALLATION
M
OBILE STATIONS
Noise type
Spark plug leads
Diode switching and
brushes
Static discharge
Contact arcing
Impulse
Motor brushes
Motor brushes
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