Motorola GM1200E Installation Manual - Page 33

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5.4

Alternator/Generator Whine

This type of interference is characterised by a high-pitched whine which varies with engine speed. A
0.5 µF coaxial capacitor (Motorola Part No. 8C82571B01) can be used to bypass the whine. For
generators, the capacitors is connected in the armature lead. Never use a capacitor in the field lead.
Use the field suppressor assembly supplied in the TLN6252A Noise Reduction Kit. For alternators,
the capacitor is connected in the lead to the battery post (see figure 2-6 and 2-7).
Step 1.
Mount Capacitor to
(0.5µF Coaxial Type)
under alternator
ground screw.
Reducing Noise Interference in Mobile Two-Way Radio Installations
Step 1.
Mount Capacitor
(0.5µF Coaxial Type)
under generator ground screw.
Step 2.
Disconnect wire (dashed)
from armature post and
connect to capacitor using
lockwasher and nut.
Figure 2-6 Generator Whine Suppression.
Figure 2-7 Alternator Whine Suppression.
Step 3.
Connect wire lead to
capacitor using lockwasher and nut.
Arm
Field
Step 2.
Disconnect wire from
battery post and connect
to capacitor using
lockwasher and nut.
Step 3.
Connect wire lead to
capacitor using lockwasher and nut.
Step 4.
Connect capacitor
lead to battery post.
Noise Reduction Techniques
Step 4.
Connect capacitor
lead to armature post.
Caution:
Do not connect
capacitor to field terminal.
Caution:
Do not connect
capacitor to field terminal.
2-9