Icom IC-M72 Instruction Manual - Page 17

BASIC OPERATION 4 Adjusting the squelch level To adjust the IC-M72's squelch level, use the [Y]/[Z] keys as desired below. In order to receive signals properly, as well as for the scan to function effectively, the squelch must be adjusted to the proper level. q Push [ ], then adjust the squelch level with [Y]/[Z]. - "SQL" and the squelch level are displayed. - There are 11 squelch levels to choose from: OP is completely open; 10 is tight squelch; 1 is loose squelch level. - When no key is pushed for 5 sec., the transceiver returns to normal condition. w Push [ ] again to return to normal operating mode. Push Shows the squelch level. Appears during squelch level adjustment Backlighting function This function is convenient for nighttime operation. The backlighting can be turned OFF in the SET mode. (p. 19) ➥ Push any key other than [PTT] to turn the backlighting ON. • The backlighting is automatically turned OFF after 5 sec. of inactivity. Voice scrambler operation (available with some versions only) D Activating the scrambler The voice scrambler provides private communications. In order to receive or send scrambled transmissions, you must 4 activate the scrambler function first. q Select an operating channel other than Channel 16, 70 or weather channels. w While pushing and holding [ ], push [SCAN•DUAL]. • "SCRM" appears. e To turn the scrambler function OFF, repeat Appears when the voice scrambler step w. function is in use. • "SCRM" disappears. D Programming scramble codes There are 32 codes (1 to 32) available for programming. Set the code in the SET mode. In order to understand each other, all transceivers in your group must use the same scramble code, as well as the same scrambler unit. See p. 22 for "Scrambler code" setting details. 11