Transmitter Operation; Microprocessor Memory Back-Up; Microprocessor Initialization - Kenwood TM-231A Instruction Manual

4-3. TRANSMITTER OPERATION
Cautions:
1. Ensure that an antenna with a low standing wave ratio
(SWR) is attached to the antenna connector before at-
tempting to transmit. Failure to provide proper termina-
tion may result in damage to the final amplifier section.
2. Always check to ensure the frequency is clear before
transmitting.
Note:
The use of LOW power is recommended, whenever possi-
ble, to avoid interfering with other stations.
Transmit
1. Select the desired operating frequency using any of the
methods previously discussed.
2. Check the frequency to see if it is occupied before you
transmit.
3. Press the PTT switch. The ON AIR indicator will light,
and the RF meter will deflect to the right.
Note:
If you have selected the LOW power position, the low
indicator will appear in the display and the RF meter will
only deflect slightly. When HI power has been selected
the RF meter will swing full scale.
4. Speak into the microphone. The recommended distance
to the microphone is 5 cm (2 inches).
Note:
Talking closer may result in overdeviation of your trans-
mit signal, which might be reported as a loss of clarity
or of an excessively wide transmit signal. Talking too far
away may result in reports of weak audio.
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5. Release the PTT switch to return to the receive made.
The ON AIR indicator should go out, and the RF meter
will return to zero.
4-4. MEMORY OPERATIONS
4-4-1. Microprocessor Memory back-up
A lithium battery is contained in this transceiver to retain
memory. Turning OFF the POWER switch, disconnecting the
power cable or an intermittent power failure will not erase
the memories. The battery life is estimated at 5 years. When
the battery has been exhausted erroneous information might
appear in the display.
Lithium battery replacement should be performed by an
authorized KENWOOD service facility, or your authorized
KENWOOD dealer. This equipment contains CMOS circuitry
and can be damaged by improper replacement procedures.
4-4-2. Microprocessor Initialization
The initial state of the microprocessor, as delivered from the
factory is shown in the following chart.