Kenwood TM-441A User Manual download pdf (Page 9)

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.

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Kenwood TM-441A User Manual Page 9