114BASIC OPERATION4 Adjusting the squelch levelTo adjust the IC-M72’s squelch level, use the [YY]/[ZZ] keys asdesired below. In order to receive signals properly, as well asfor the scan to function effectively, the squelch must be ad-justed to the proper level.q Push [ ], then adjust the squelch level with [YY]/[ZZ].- “SQL” and the squelch level are displayed.- There are 11 squelch levels to choose from: OP is completelyopen; 10 is tight squelch; 1 is loose squelch level.- When no key is pushed for 5 sec., the transceiver returns tonormal condition.w Push [ ] again to return to normal operating mode. Backlighting functionThis function is convenient for nighttime operation. The back-lighting 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. ofinactivity. Voice scrambler operation(available with some versions only)D Activating the scramblerThe voice scrambler provides private communications. Inorder to receive or send scrambled transmissions, you mustactivate the scrambler function first.q Select an operating channel other than Channel 16, 70 orweather channels.w While pushing andholding [ ], push[SCAN•DUAL].• “SCRM” appears.e To turn the scramblerfunction OFF, repeatstep w.• “SCRM” disappears.D Programming scramble codesThere are 32 codes (1 to 32) available for programming. Setthe code in the SET mode. In order to understand each other,all transceivers in your group must use the same scramblecode, as well as the same scrambler unit. See p. 22 for“Scrambler code” setting details.Push Shows the squelchlevel.Appears during squelchlevel adjustmentAppears when the voice scramblerfunction is in use.

safety training information

OPERATING RULES

I Supplied accessories

battery pack

I Front, top and side panels

I Function display

I Channel selection

weather channels

I Receiving and transmitting

I Call channel programming

I Adjusting the squelch level

I VOX function

basic operation

I Scan types

I Setting TAG channels

DUALWATCH/TRI-WATCH

I SET mode programming

I SET mode items

auto scan function

set mode

I Battery cautions

I Supplied battery charger

I Optional battery chargers

battery charging

OPTIONAL SWIVEL BELT CLIP

OPTIONAL SPEAKER-MICROPHONE

TROUBLESHOOTING

VHF MARINE CHANNEL LIST

SPECIFICATIONS

OPTIONS

Icom IC-M72 Instruction Manual

IC-M72

specifications

main unit

receive circuits

pll circuits

power supply circuits

parts list

mic board

instruction manual

in case of emergency

explicit definitions

SUPPLIED ACCESSORIES AND ATTACHMENTS

PANEL DESCRIPTION

Function display

BASIC OPERATION

Receiving and transmitting

Call channel programming

Adjusting the squelch level

VOX function

SCAN OPERATION

SET mode

SET mode items

lcd contrast selection

channel name scroll type

Battery cautions

Supplied battery charger

Optional battery chargers