Kenwood TM-521E - Manual (Page 7)

3-2. CONNECTIONS
Cautions:---------------------------------------------
1. Before connecting or disconnect­
ing the DC Power Cable, be sure
to turn off the POWER switches
of both the transceiver and the
DC Power Supply.
2. Observe polarity of the DC
Power Cable. The transceiver
operates on 13.8 VDC, negative
ground. The DC Power Cable is
color coded:
Red ^ -I- (Positive polarity)
Black — (Negative polarity)
3-2-1. Mobile
1. Battery Connections
Connect the DC Power Cable directly
to the battery terminals. Use of the
cigarette lighter socket can lead to
poor connection, and result in poor
performance. Pay close attention to
the polarity of the cables when con­
necting them to the battery.
Cautions:-----------------------------------------------
Make sure the positive (+) and negative (-) lead polarity are correct
\Aihen wiring to the battery.
Engine compartment
Red
Fuse (20A)
Passenger compartment
DC Power Cable
_____ i _____
To the
1 transceiver
® e
Battery
Select the location
where the power cable
is protected from heat,
moisture or abrasion.
Secure the cable.
Make sure the cable
does not directly con­
tact the edge of the hole
by using a grommet.
If 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
Thread like this.
1. Before installing the DC Power Cable, be sure to
remove the negative lead from the battery for
safety.
4.
2. After installation and wiring, be sure to double
check for correct installation before reconnect­
ing the negative lead to the battery terminal.
5.
3. If the fuse opens, be sure to check that each con­
ductor has not been damaged by short-
circuiting, etc.
Then replace with a new fuse of the same rating.
After completing the wiring, wrap the fuse
holder with heat resistant tape to protect against
heat and moisture.
Do not remove the fuse even if the power cable
is too long.
2. Ignition Noise
The 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), or an external Noise Filter
3-2-2. Fixed Station
A regulated DC Power Supply (13.8 VDC) is re­
quired. The PS-430 and the PS-50 are recommend­
ed.
3-2-3. Antenna
Warning:-------------
For protection against fire, electric shock, personal
injury, or damage to the radio, use a lightning ar­
rester in your antenna lines.
The type of antenna that is used will greatly affect
the performance of the transceiver. Use a properly
adjusted antenna, of good quality, to enable your
transceiver to perform at its best. The antenna input
impedance is 50 ohms. Use 50-ohm VHF/UHF coax­
ial cable for this connection. If the antenna is far
from the transceiver the use of low loss coaxial cable
is recommended. Match the impedance of the coax­
ial cable and that of the antenna so that the SWR is
less than 1.5 to 1. The protection circuit in the
transceiver will activate if the SWR is particularly
poor (greater than 3 to 1).
Note:-----------------------------------------------------------------------------
High SWR values will cause the transmitter output to
drop, and may lead to TVI or BCI reports.