Kenwood TH-27A - Manual (Page 9)

0 MONI switch
When operating in the CTCSS (Tone Squelch) mode you
can use this key to determine if the frequency is in use
before transmitting. Pressing this key will disable the
CTCSS function as long as the key is held depressed.
(D PTT (Push To Talk) switch
Press this switch whenever you wish to transmit.
0 POWER switch
Press for longer than 0.3 second to turn the transceiver
ON or OFF.
0 LAMP key
This switch is used to control the night lamp on the LCD
display. The lamp will turn itself OFF automatically 5
seconds after the last key operation.
Pressing the key within 1 0 seconds of pressing the F key
will light the lamp on the LCD display until pressing this
key again.
0 TONE/TONE SEL key
Except European version; This key is used to activate the
subaudible tone encoder.
European version; This key is used to transmit the
1750Hz repeater access tone whenever this key is
depressed.
U.S.A., Canada, or with optional TSU-7; Pressing the key
within 10 seconds of pressing the F key will switch to
the tone frequency selection mode. The Tuning control
can then be used to select the desired tone frequency.
(D CALL/C. SCAN key
Press this key to activate the call channel function.
Pressing the key within 1 0 seconds of pressing the F key
will start or stop CALL channel scanning.
0 DTSS/PAG key
This key is used to activate the DTSS function.
Pressing the key within 1 0 seconds of pressing the F key
will turn the PAGING function on or off.
(D LOW/CLOCK key
This key is used to switch the transmit output power;
Medium(M)/Low(L)/Economic-Low(EL)/High (no
indicator).