Kenwood TH-77A Instruction Manual page 21

4-3. TRANSMITTER OPERATION
NOTE
1. Ensure that an antenna with a low standing wave
ratio (less than 1.5 SWR) is attached to the
antenna connector before attempting to transmit.
Failure to provide proper termination may result
in damage to the final amplifier section.
2. Always check that the frequency is clear before
transmitting.
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. Select the desired operating frequency in the main
band using any of the methods previously discussed.
. Check the frequency to see if it is occupied before
you transmit.
. Press the PTT switch. The ON AIR indicator will light,
and the battery level meter will light.
. Speak into the microphone. The recommended
distance to the microphone is 5 cm (2_ inches).
NOTE
Talking closer may result in overdeviation of your
transmit signal, which might be reported as a loss
of clarity or an excessively wide transmit signal.
Talking too far away may result in reports of weak
audio.
. Release the PTT switch to return to the receive mode.
The ON AIR indicator should go out, and the battery
evel meter will return to zero.
HETX.STOP function
Pressing the M/TX.S key within 10 seconds of pressing
the F key will set the TX.STOP function on or off.
HDuplex Operation
Pressing the DUAL / DUP key within 10 seconds of
pressing the F key will cause the duplex operation to
activate. DUP indicator will light. Pressing the PTT
switch allows simultaneous receive on a UHF (VHF) and
transmit on the other band.
NOTE
In the UHF dual watch operation the
simultaneously receive and transmlt.
Receiver sensitivity may be suppressed with certain
combinations of transmit and receive frequencies.
Use of earphone causes no howling.
radio cannot
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