367 OTHER FUNCTIONS Intercom operationThe optional Intercom function allows you to talk to the deckfrom the cabin. The optional HM-127 REMOTE-CONTROL MI-CROPHONE is required for Intercom operation.Connect an optional HM-127 as described on pgs. 43, 65.• Transmitting is impossible during Intercom operation.• The received signal is muted during Intercom operation.q Push [[LO/DXLO/DX]] (( SCR)SCR) for 1 sec. to enter Intercom mode.• The HM-127 power is automatically turned ON, even if the poweris OFF.w Push and hold [[LO/DXLO/DX]] (( SCR)SCR) again to call up.• The transceiver and microphone emit call beeps.e Push and hold the PTT switch and speak at a normal voicelevel into the microphone.• “TALK” or “LSTN” appears on the caller or listener function dis-play, respectively.• To adjust the IC-M502A’s speaker output level, rotate [[VOLVOL]].• To adjust the HM-127’s speaker output level, push after [[VOLVOL]]pushing [[ YYYY]]/[[ ZZZZ]].r After releasing the PTT switch you can hear the responsethrough the speaker.t To return to the normal operation, push [[LO/DXLO/DX]] (( SCR)SCR)momentarily.• Other keys also turn the function OFF, however, the correspond-ing function is then activated (e.g. pushing [[ 99]] selects Chan-nel 16).• While in the Intercom mode, the transceiver functions(transmit and receive) are interrupted. If the transceiver isin transmit condition, the Intercom function is not avail-able.• When a DSC call is received, “DSC received” ap-pears and the last received DSC message is displayedafter the Intercom use is finished.• When a WX alert is received, “WX ALT” blinks and abeep sounds. The WX alert sounds after the Intercom useis finished.1616ICIntercomINT INTTALKIC-M502A (caller) HM-127 (listener)ICIntercomINT INTIC-M502A HM-127IC

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