Kenwood TM-441A User Manual
Page 9
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4-2-2 Fixed Station
4-2-3 Antenna
A regulated DC power supply (13.8 VDC capable of
supplying at least 11 Amperes) is required. The PS-430
or the PS-50 are recommended.
1. Never connect the AC power cable to the AC
outlet until all other connections have been
made.
2. Before connecting and disconnecting the power
connector, be sure to turn OFF the POWER
switches of both the transceiver and the DC
power supply.
3. Observe polarity of the DC power cable. The
transceiver operates on 13.8 VDC, negative
ground. Battery polarity must be correct. The
power cable is color coded :
Red + (Positive polarity)
Black -> — (Negative polarity)
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 coaxial cable such as RG-8U or 8D-2V
for this connection. If the antenna is far from the
transceiver the use of low loss coaxial cable, such as RG-
8U is recommended. Match the impedance of the
coaxial 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).
High SWR values will cause the transmitter output to
drop, and may lead to TVI or BCI reports.
Caution :
We recommend that you install a high quality
lightening arrestor in your antenna lines for
protection
against
fire,electric
shock,personal
injury,or damage to the radio itself.