Kenwood TM-621A Instruction Manual page 8

A. Battery Connections
Connect the power cable directly to the battery terminals.
Use of the cigarette lighter socket can lead to poor connec-
tion, and result in poor performance. Pay close attention to
the polarity of the cables when connecting them to the bat-
tery.
Make sure the positive (+) and negative (—) lead polarity is correct
when connecting to the battery.
Red
Engine compartment -—}|—-~ Passenger compartment
Fuse
To the
transceiver
Select a location where
E power cable is pro- brargpondet bran pmo
does not directly con
tact the edge of the hole
¢ by using a grommet.
Chassis or
fire wall
tected from heat, mois-
ture or abrasion when
securing
Battery
the cable.
@ lf the wiring hole in the fire wall or chassis is too small,
disassemble the fuse holder to thread the wire through the hole.
From passenger
compartment
oy ——————
Thread like this
B. Ignition Noise
This transceiver has been designed to suppress ignition
noise; however, if excessive noise is present, it may be
necessary to use suppressor spark plugs (with resistors).
3-2-2. Fixed Station
A regulated DC power supply (13.8 VDC capable of sup-
plying at least 10 Amperes) is required. The PS-430 and
the PS-50 are recommended.
CAUTION:
. Never connect the AC power cable to the AC outlet until
1
2.
all other connections have been made.
Before connecting and disconnecting the power connec-
tor, be sure to turn off the POWER switches of both the
transceiver and the DC power supply.
. Observe polarity of the DC power cable. The transceiver
operates on 13.8 VDC, negative ground. Battery polari-
ty must be correct. The power cable is color coded:
Red — + (Positive polarity)
Black — — (Negative polarity)
+
[ ? TM-621A or SP-430
6
—
TM-621A : To 220 MHz antenna
TM-721A/721E : To 430/440 MHz antenna