Kenwood TH-31A User Manual
Page 7
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(D
Tone switch
• Activates the sub tone (TH-41 BT/31 BT/21 BT).
• Tone unit is the optional TU-6 (TH-41 A/31A/21 A).
• Activates 1 750 Hz tone (TH-41 E/21 E).
(D
+5 kHz switch
•
When the switch is ON the operating frequency is 5 kHz higher
than indicated by the thumb wheel switches.
0
Frequency setting switches (Thumb wheel switches)
A.... Used to set to 1 MHz.
B....Used to set to 100 kHz.
C.... Used to set to 10 kHz.
0 ON AIR indicator
• Lights for transmission.
•
When this indicator lights dimly, replace the batteries with new
ones.
0 SQ control (Squelch control)
•
Used to eliminate noise at non-signal condition. For normal opera
tion, turn the knob clockwise to the point at which noise just dis
appears.
(3B) PTT switch (Press-To-Talk switch)
• Press this switch and speak into the micro phone for transmission.
• The microphone is built in the same place as the speaker.
0 Hi/Low switch
• Used to adjust the transmission output.
•
At Hi position, the output power is 1 W. At Low position, the out
put power is about 1 50 mW.