Motorola GM1200E Посібник з монтажу - Сторінка 34
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Друкувати сторінкуNoise Reduction Techniques
5.5
Voltage Regulator Noise
This type of interference is characterised 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.
8C82571B01) in the battery and armature leads of the voltage regulator (see figure 2-8).
CAUTION:
Step 1.
Mount Capacitor
(0.5µF 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.
5.6
Hood and Trunk Lid Noise
This type of noise is characterised by irregular popping sounds. It is caused by friction in poorly
bonded automobile hoods or trunk lids, which 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
TLN8845A or TLN6252A Noise Reduction Kits) which provides electrical bonding of the hood or
trunk to the vehicle body while permitting them to be opened.
2-10
Disconnect the battery ground terminal before attempting to connect components
to the voltage regulator.
Vehicle
Chassis
Battery
Post
Field
A coaxial capacitor can
be added here, if required.
Figure 2-8 Voltage Regulator Noise Suppression.
Reducing Noise Interference in Mobile Two-Way Radio Installations
Armature
Step 3.
Add lead from battery
post to capacitor using
lockwasher and nut.