12DUALWATCH/TRI-WATCH5 DescriptionDualwatch monitors Channel 16 while you are receivinganother channel; Tri-watch monitors Channel 16 and the callchannel while receiving another channel. Dualwatch/Tri-watchis convenient for monitoring Channel 16 when you are oper-ating on another channel. Operationq Select Dualwatch or Tri-watch in Set mode. (p. 33)w Push [Y] or [Z] to select the desired operating channel.e Push [CH/WX•DUAL] for 1 sec. to start Dualwatch or Tri-watch.• “ ” blinks during Dualwatch; “ ” blinks during Tri-watch.• A beep tone sounds when a signal is received on Channel 16.r To cancel Dualwatch/Tri-watch, push [CH/WX•DUAL] again.DUALWATCH/TRI-WATCH SIMULATION• If a signal is received on Channel 16, Dualwatch/Tri-watchpauses on Channel 16 until the signal disappears.• If a signal is received on the call channel during Tri-watch,Tri-watch becomes Dualwatch until the signal disappears.• To transmit on the selected channel during Dualwatch/Tri-watch, push and hold [PTT].Dualwatch Tri-watchCall channel [Example]: Operating Tri-watch on INT Channel 25Tri-watch starts.Signal is received on callchannel.Signal is received onChannel 16 takes priority.Tri-watch resumes afterthe signal disappears.

OPERATING RULES

panel description

I Microphone

I Function display

basic operation

I Receiving and transmitting

I Call channel programming

I Channel comments

scan operation

I Setting TAG channels

I Operation

I MMSI code check

I DSC Address ID

i position indication

i distress call

I Transmitting DSC calls

dsc operation

transmitting a group call

transmitting an all ships call

I Receiving DSC calls

receiving a group call

other functions

I Public Address (PA) function

I Set mode items

set mode

I Fuse replacement

I Optional MB-69 installation

TROUBLESHOOTING

SPECIFICATIONS AND OPTIONS

i panel description

I Channel selection

I Lock functions

I Display backlight

I Starting a scan

I Set mode programming

I Intercom operation

I HM-157 supplied accessories

I Installation

CHANNEL LIST

TEMPLATE

Icom IC-M422 Instruction Manual

IC-M422

MAIN UNIT

LOGIC BOARD

TRANSMITTER CIRCUITS

PLL CIRCUITS

POWER SUPPLY CIRCUITS

PREPARATION

FREQUENCY ADJUSTMENT

TRANSMIT ADJUSTMENT

RECEIVE ADJUSTMENT

front unit

SQL BOARD

MECHANICAL PARTS AND DISASSEMBLY

VOLTAGE DIAGRAM