Icom IC-GM1600 Instruction Manual - Page 15

BASIC OPERATION 4 I Lock function This function electronically locks all keys (except for [PTT], [SQL•MONI] and [Hi/Lo• ]) to prevent accidental channel changes and function access. ➥ Push [Hi/Lo• ] for 1 sec. to turn the lock function ON and OFF. Push for 1 sec. Appears while the lock function is used. I Signal strength indicator The received signal strength level is indicated by number of bars as below. • Only the antenna mark appears when receiving no signal or a very weak signal when the signal strength indicator is set to ON in the SET mode (p. 14). • This indicator can be hidden by using the SET mode (p. 14) if desired. Indication Signal strength Strong Middle Weak No signal or Very weak I Monitor function The monitor function releases the noise squelch mute to check the volume level. See p. 12 for details of the monitor switch action. ➥ Push [SQL•MONI] for 1 sec. and keep holding to activate 4 the monitor function. • " " appears and audio is emitted. I Backlighting function This function is convenient for nighttime operation. The backlighting brightness can be adjusted in the SET mode. (p. 12) ➥ Push any key except for [PTT] to turn the backlighting ON. • The backlighting is automatically turned OFF after 5 sec. of inactivity. I VOX function (FOR ON-BOARD USE ONLY) The VOX function (voice operated transmission) starts transmission without pushing [PTT] when you speak into the microphone; then automatically returns to receive when you stop speaking (hands-free operation becomes possible). NOTE: An optional headset and headset adapter (OPC1392) is required for the VOX operation. ➥ Push and hold [SQL•MONI], then push [Hi/Lo• ] to turn the VOX function ON/OFF while connecting the optional headset and headset adapter to the [MIC/SP] connector. • "VOX" appears on the LCD while the VOX function is ON. • The "VOX gain" and "VOX delay" can be set in the SET mode. (pgs. 14 and 15) 10