3. transmitter operation – Kenwood TH-27A User Manual
Page 18
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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.
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 battery level meter will light.
4. Speak into the microphone. The recommended dis
tance 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.
5. Release the PTT switch to return to the receive mode.
The ON AIR indicator should go out, and the battery
level meter will return to zero.
■ Time Out Timer
The transceiver has a time-out timer function to prevent
possible problems caused by continuous transmission.
This function forcibly stops continuous transmission
after 1 0 minutes. When the timer times out, the trans
ceiver beeps and automatically returns to the RX mode.
Press the PTT switch to transmit again.
■ TX. STOP
Pressing the M/TX.S key within 1 0 seconds of pressing
the F key will set the TX. STOP function on or off.
■ Changing Transmitter Output Power
Pressing the LOW key will allows you to select 4 different
transmitter output power levels. The actual transmitter
output power for this unit depends on the power supply
being used.
• H (High power): For maximum output power.
• M (Medium power)
• L (Low power): For short-distance communication.
• EL (Economic Low power): For line-of-sight short-
distance communication.
Output Power
TH-27A/27E
TH-47A/47E
L
EL
H
M
H
M
PB-13
2.5
2
2
1.5
0.5
20
Manganese Battery
5
2.5
5
2.5
0.5
20
Alkaline Battery
2.5
2
2
1.5
0.5
20
18