Icom IC-F9021 Instruction Manual 1 - Page 16

2 PANEL DESCRIPTION D For ABC and Toggle switches only ZONE SWITCH Selects the pre-programmed zone directly. PRIO A AND PRIO B SWITCHES Selects Priority A or Priority B channel. MR-CH 1, MR-CH 2, MR-CH 3 AND MR-CH 4 SWITCHES Selects the memory channels 1, 2, 3 and 4, directly. TALK AROUND SWITCH (Conventional operation only) Turns the talk around function ON and OFF. • The talk around function equalizes the transmit frequency to the receive frequency for transceiver-to-transceiver communication. LOCK SWITCH Turns the lock function ON and OFF. All programmable keys except the following are locked: [PTT], [Moni], [Light], [Lock], [Emergency], [Surveillance] and [OPT 1/2/3]. HIGH/LOW SWITCH Selects the transmit output power temporarily. • Ask your dealer for the output power level for each selection. SURVEILLANCE SWITCH Turns the surveillance function ON or OFF. When this function is turned ON, the beep is not emitted and the LCD backlight does not light when a signal is received or a key is pushed, etc. COMPANDER SWITCH Turns the compander function ON and OFF. The compander function reduces noise components from the transmitted audio to provide clear communication. OPT MOMENTARY SWITCHES Controls the output signal level from the optional unit connector. 11