Noise Reduction Techniques
Reducing Noise Interference in Mobile Two-Way Radio Installations
2-9
5.4
Alternator/Generator Whine
This type of interference is characterised by a high-pitched whine which varies with engine speed. A
0.5
µ
F 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).
Figure 2-6 Generator Whine Suppression.
Figure 2-7 Alternator Whine Suppression.
Step 1.
Step 3.
Step 4.
Caution:
Do not connect
capacitor to field terminal.
Connect capacitor
lead to armature post.
Connect wire lead to
capacitor using lockwasher and nut.
Mount Capacitor
(0.5
µ
F Coaxial Type)
under generator ground screw.
Step 2.
Disconnect wire (dashed)
from armature post and
connect to capacitor using
lockwasher and nut.
Field
Arm
Step 1.
Step 2.
Step 3.
Step 4.
Mount Capacitor to
(0.5
µ
F Coaxial Type)
under alternator
ground screw.
Disconnect wire from
battery post and connect
to capacitor using
lockwasher and nut.
Connect capacitor
lead to battery post.
Connect wire lead to
capacitor using lockwasher and nut.
Caution:
Do not connect
capacitor to field terminal.
