Using the 9350 Automatic Tuning Whip Antenna with a 2110 Manpack Transceiver
Manpack Transceiver 2110 series Reference Manual 55
Radio frequency interference
Types of noise
Engine noise and electrical accessories often cause RF interference.
Noise interference can be:
• induced into and carried along the cables to the transceiver
• radiated from the noise source and picked up at the antenna
Noise from the ignition system
The ignition system of a petrol motor vehicle is often a major noise source.
High-voltage wiring
All high-voltage wiring from the ignition coil to the spark plugs should be:
• as short as possible
•clean
• as close to the engine block as possible
• of a suppressed type
Table 17: Noise source and type
System Noise source Noise type
Ignition Ignition Distributor and spark plug
leads
Battery charging Alternators Diode switching and brushes
Other Brakes and bearings Static discharge
Mechanical voltage regulators Contact arcing
Oil pressure sender Contact arcing
Tachometer Impulse
Winches Motor brushes
Wipers and fan motors Motor brushes
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