3BASIC OPERATION6rc- Receiving and transmittingCAUTION: Transmitting without an antenna may dam-age the transceiver.q Turn [VOL] right to turn power ON.w Set the audio and squelch levels.➥ Rotate [SQL] fully counterclockwise in advance.➥ Rotate [VOL] to adjust the audio output level.➥ Rotate [SQL] clockwise until the noise disappears.e Push [Y]/[Z] to select the desired channel. (p. 5)• When receiving a signal, “BUSY” appears and audio is emittedfrom the speaker.r Push [H/L] to select the output power if necessary.• “LOW” appears when low power is selected.• Choose high power for stronger signal propagation.• Some channels are for low power only.t Push and hold [PTT] to transmit, then speak into the mi-crophone.• “TX” appears.• Channel 70 cannot be used for transmission (for DSC use).Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-NOT be lawfully used by the general public in U.S.A. wa-ters.y Release [PTT] to receive.IMPORTANT: To maximize the readability of your trans-mitted signal, pause a few sec. after pushing [PTT], holdthe microphone 1 to 2 inches (2.5 to 5 cm) from yourmouth and speak at a normal voice level.F..

OPERATING RULES

I Panel description

I Function display

PANEL DESCRIPTION .................. 2

I Channel selection

I Microphone lock function

BASIC OPERATION ....................... 5

DUALWATCH/TRI-WATCH

I Setting tag channels

SCAN OPERATIONS .................... 9

I MMSI code programming

I Distress call

I Transmitting DSC calls

I DSC individual ID

I Receiving DSC calls

DSC OPERATION ....................... 11

I Intercom operation

I Set mode programming

set mode

MAINTENANCE

I Connections

I Mounting the transceiver

I MB-69 mounting bracket (Option)

I Receiving and transmitting

I Lock functions

I Display backlighting

I Starting a scan

I Channel names

I Installation

TROUBLESHOOTING

CHANNEL LIST

SPECIFICATIONS

I Dimensions

MB-69/HM-127 TEMPLATE

OPTIONS

Icom IC-M402 Instruction Manual

IC-M402

HM-127 (OPTIONAL UNIT)

LOGIC BOARD

MAIN UNIT

PLL CIRCUITS

HM-129

PORT ALLOCATIONS

PREPARATION

PLL ADJUSTMENTS

TRANSMITTER ADJUSTMENTS

front unit

IC-M402S