114BASIC OPERATION4 Adjusting the squelch levelTo adjust the IC-M90’s squelch level, use the [Y]/[Z] keys asdesired below. In order to receive signals properly, as well asfor the scan to function effectively, the squelch must be adjustedto the proper level.q Push [SQL•MONI], then adjust the squelch level with [Y]/[Z].- “SQL” indicator starts blinking.- There are 11 squelch levels to choose from: OP is completelyopen; 10 is tight squelch; 1 is loose squelch level.- When no switch is pushed for 5 sec., the transceiver returns tonormal condition.w Push [SQL•MONI] again to return to normal condition. Backlighting functionThis function is convenient for nighttime operation. The back-lighting brightness can be adjusted in the SET mode. (p. 18)➥ Push any switch except for [PTT] to turn the backlightingON.• The backlighting is automatically turned OFF after 5 sec. ofinactivity. Voice scrambler operationD Activating the scramblerThe voice scrambler provides private communications. Inorder to receive or send scrambled transmissions, you mustactivate the scrambler function first.q Select an operatingchannel except Channel16, 70 or weather chan-nels.w While pushing andholding [SQL•MONI],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 have the same scramblecode, as well as the same scrambler unit. See p. 20 for “Scram-bler code” setting details.Appears when the voicescrambler function is in use.Blinks during the squelchlevel adjutment.Indicates thesquelch level.Push

OPERATING RULES

I Attachments

battery pack

panel description

I Function display

I Channel selection

weather channels

I Receiving and transmitting

I Call channel programming

I Adjusting the squelch level

scan operation

I Setting tag channels

DUALWATCH/TRI-WATCH

I CTCSS and DTCS display

I SET mode programming

I SET mode items

set mode

I Battery cautions

I Optional battery case

I Optional battery chargers

battery charging

I Attachment

TROUBLESHOOTING

VHF MARINE CHANNEL LIST

SPECIFICATIONS

QUICK REFERENCE

OPTIONS

Icom IC-M90 Instruction Manual

IC-M90

instruction manual

safety training information

in case of emergency

explicit definitions

supplied accessories and attachments

d battery pack

PANEL DESCRIPTION

function display

BASIC OPERATION

receiving and transmitting

call channel programming

adjusting the squelch level

setting tag channels

land channel operation

set mode items

charging connections

optional battery chargers

optional swivel belt clip

troubleshooting