114DUALWATCH/TRI-WATCH DescriptionDualwatch monitors Channel 16 while you are receiving an-other channel; Tri-watch monitors Channel 16 and call chan-nel while receiving another channel. Operationq Select Dualwatch or Tri-watch in Set mode. (p. 39)w Select the desired operating channel.e Push [[CH/WXCH/WX]] (( U/I/C)U/I/C) for 1 sec. to start Dualwatch orTri-watch.• “DUAL” appears during Dualwatch; “TRI” appears during Tri-watch.• A beep tone sounds when a signal is received on Channel 16.r To cancel Dualwatch or Tri-watch, push [[CH/WXCH/WX]] (( U/I/C)U/I/C)again.DWDW[Example]: Operating Tri-watch on INT Channel 25.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 call channel during Tri-watch, Tri-watchbecomes Dualwatch until the signal disappears.• To transmit on the selected channel during Dualwatch/Tri-watch,push and hold [[PTTPTT]].Dualwatch Tri-watchCall channelINT25WDUP16TAGTRIINT25WDUP16TAGTRIBUSY INT25W CALL16TAGTRIBUSY INT25WDUP16TAGTRITri-watch starts.Signal is receivedon call channel.Signal received onChannel 16 takespriority.Tri-watch resumesafter the signaldisappears.43

OPERATING RULES

I Front panel

panel description 2

I Function display

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

I Channel selection

basic operation

I Receiving and transmitting

I Call channel programming

BASIC OPERATION ............ 6

DUALWATCH/TRI-WATCH

I Scan types

I Setting tag channels

I MMSI code programming

dsc operation

I Position and Time programming

I Position/Time indication

I Distress call

I Transmitting DSC calls

I Receiving DSC calls

I Received messages

dsc set mode

I Intercom operation

I Microphone lock function

I Set mode programming

I Set mode items

set mode

I Supplied accessories

I Connections

I Mounting the transceiver

I Optional unit installation

I Dimensions

troubleshooting

CHANNEL LIST

SPECIFICATIONS AND 5

I Options

I Panel description

I Lock functions

I RF attenuator function

I Dualwatch/Tri-watch operation

I Starting a scan

I Channel comments

I HM-127 supplied accessories

I Installation

Icom IC-M502A Instruction Manual

IC-M502A