Motorola Radius CM200 Installation Manual - Page 33

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Noise Reduction Techniques

10.4

Voltage Regulator Noise

This type of interference is characterized by erratic popping noises which change only slightly with

changes in engine speed. The noise is generated by arcing in the vibrating breaker contacts of the

voltage regulator. It can be suppressed by connecting a 0.5 µF coaxial capacitor (Motorola Part No.

0882571B01) in the battery and armature leads of the voltage regulator (see Figure 10-4).

CAUTION: Disconnect the battery ground terminal before attempting to connect components

to the voltage regulator.

Step 1.

Mount Capacitor

(0.5 F Coaxial Type)

to vehicle chassis

using lockwasher and

self-tapping screw.

Step 2.

Disconnect wire (dashed)

from battery post and

connect to capacitor

using lockwasher and nut.

10.5

This type of noise is characterized by irregular popping sounds. It is caused by friction in poorly

bonded automobile hoods or trunk lids. This friction causes static electricity to build up until arcing

occurs. This type of noise is suppressed using a Motorola Hood Wipers and Mounting Hardware Kit

(part of the TLN5277 Noise Reduction Kit) which provides electrical bonding of the hood or trunk to

the vehicle body while permitting them to be opened.

10.6

Other elements of the electrical system which can generate noise are listed below. These can be

suppressed by connecting a 0.5 µF bypass capacitor between the noise source and ground.

1. Ammeter-to-battery lead

2. Gauges (oil, fuel, temperature)

Vehicle

Battery

Post

A coaxial capacitor can

be added here, if required.

Figure 10-4. Voltage Regulator Noise Suppression

Armature

Step 3.

Add lead from battery

post to capacitor using

lockwasher and nut.

FL0830265-O