Icom IC-M88 Instruction Manual - Page 17

BASIC OPERATION 4 Adjusting the squelch level The IC-M88 has a squelch even though there is no control knob for it. 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 [SQL], then adjust the squelch level with [Y]/[Z]. - "SL" indicator appears. - There are 11 squelch levels to choose from: OP is completely open; 10 is the tight squelch level. - When no key is pushed for 5 sec., the transceiver returns to nor- mal condition. w Push [SQL] again to return to normal condition. Automatic backlighting This function is convenient for nighttime operation. The automatic backlighting can be activated in SET mode. (p. 19) ➥ Push any key except for [PTT] to turn the backlighting ON. • The backlighting is automatically turned OFF after 5 sec. of inactivity. Voice scrambler operation (Available for I/S version only) D Activating the scrambler The optional voice scrambler provides private communications. In order to receive or send scrambled transmissions, you must first activate the scrambler function. q Select an operating channel except Channel 16, 70 or weather channels. w While pushing and holding [SQL], push [SCN•DUAL]. • "SCRM" appears. e To turn the scrambler function OFF, repeat step w. • "SCRM" disappears. Appears when the voice scrambler function is in use. D Programming scramble codes There are 32 codes (1 to 32) available for programming. Set the code in SET mode. In order to understand each other, all transceivers in your group must have the same scramble code, as well as the same scrambler unit. See page 21 for scrambler code setting details. 11