! IC-M502_4.qxd 02.3.23 9:31 AM Page a (1,1) INSTRUCTION MANUAL VHF MARINE TRANSCEIVER iM502 This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
! IC-M502_4.qxd 02.3.23 9:31 AM Page b (1,1) IMPORTANT READ ALL INSTRUCTIONS carefully and completely SAVE THIS INSTRUCTION MANUAL — This in- before using the transceiver. struction manual contains important operating instructions for the IC-M502. IN CASE OF EMERGENCY If your vessel requires assistance, contact other vessels and the Coast Guard by sending a distress call on channel 16. USING CHANNEL 16 USING DIGITAL SELECTIVE CALLING (Ch 70) DISTRESS CALL PROCEDURE DISTRESS CALL PROCEDURE 1.
! IC-M502_4.qxd 02.3.23 9:31 AM Page c (1,1) TABLE OF CONTENTS ■ Position and time programming .... 14 ■ Position indication ......................... 15 ■ Distress call .................................. 16 ■ Transmitting DSC calls ................. 17 ■ Setting the distress information .... 21 ■ DSC individual ID ......................... 22 ■ Receiving DSC calls ..................... 23 ■ DSC set mode .............................. 26 ■ Receive messages ....................... 28 IMPORTANT ..........
! IC-M502_4.qxd 02.3.23 9:32 AM Page d (1,1) CAUTIONS RWARNING! NEVER connect the transceiver to an AC outlet. This may pose a fire hazard or result in an electric shock. CAUTION: Changes or modifications to this device, not expressly approved by Icom Inc., could void your authority to operate this device under FCC regulations. NEVER connect the transceiver to a power source of more than 16 V DC or use reverse polarity. This will ruin the transceiver.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 1 (1,1) OPERATING RULES PRIORITIES • Read all rules and regulations pertaining to priorities and keep an up-to-date copy handy. Safety and distress calls take priority over all others. • You must monitor channel 16 when you are not operating on another channel. • False or fraudulent distress signals are prohibited and punishable by law. PRIVACY • Information overheard but not intended for you cannot lawfully be used in any way.
! IC-M502_4.qxd 02.3.23 9:32 AM 2 Page 2 (1,1) PANEL DESCRIPTION ■ Panel description q POWER SWITCH [POWER] Push to toggle the transceiver power ON and OFF. w VOLUME CONTROL [VOL] Adjusts the audio level. (p. 8) e SQUELCH CONTROL [SQL] Sets the squelch threshold level. (p. 8) 2 r TRANSMIT POWER SWITCH [HI/LO] ➥ Toggles high and low power when pushed. (p. 8) • Some channels are set to low power only. ➥ While pushing this switch, other switches perform secondary functions.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 3 (1,1) PANEL DESCRIPTION ➥ While pushing [HI/LO], rotate [CHANNEL] to adjust the brightness of the LCD and switch backlight. y ATTENUATOR/INTERCOM/SCRAMBLER SWITCH [LO/DX•IC•SCR] ➥ Toggles the attenuator function ON and OFF when pushed momentarily. (p. 8) • “LOCAL” appears when the attenuator is in use. The order of indication precedence is “LOCAL,” “SP OFF” and “CALL.” ➥ Activates an optional intercom function when pushed for 1 sec. (p.
! IC-M502_4.qxd 02.3.23 9:32 AM 2 Page 4 (1,1) PANEL DESCRIPTION ■ Function display ➥ “Low battery” flashes when the battery voltage drops to approx. 10 V DC or below. ➥ “DUAL” appears during dualwatch; “TRI” appears during tri-watch. (p. 11) t SCRAMBLER INDICATOR (p. 10) Appears when an optional voice scrambler is activated. y DUPLEX INDICATOR (p. 6) Appears when a duplex channel is selected. q BUSY/TRANSMIT INDICATOR (p. 8) ➥ “BUSY” appears when receiving a signal or when the squelch opens.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 5 (1,1) PANEL DESCRIPTION 2 ■ Microphone q PTT SWITCH [PTT] Push and hold to transmit; release to receive. (p. 8) Y]/[Z Z] w CHANNEL UP/DOWN SWITCHES [Y Push either switch to change the operating memory channel, set mode contents, etc. (p. 8) e TRANSMIT POWER SWITCH [HI/LO] ➥ Same as the [HI/LO] switch on the front panel. (p. 8) ➥ While pushing [HI/LO] on the supplied microphone, turn power ON to toggle the lock function ON and OFF. (p.
! IC-M502_4.qxd 02.3.23 9:32 AM 3 Page 6 (1,1) BASIC OPERATION ■ Channel selection Channel 16 Channel 16 is the distress and safety channel. It is used for establishing initial contact with another station and for emergency communications. Channel 16 is monitored during both dualwatch and tri-watch. While standing by, you must monitor channel 16. ➥ Push [16•9] momentarily to select channel 16.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 7 (1,1) BASIC OPERATION • “DUP” appears for duplex channels. • “A” appears for simplex channels. 3 “Weather alert” on p. 31. q Push [CH/WX] once or twice to select a weather channel. • “WEATHER” appears when a weather channel is selected. “WX ALT” appears when the weather alert function is in use. (p. 31) w Rotate the channel selector to select a channel. • Channels are memorized separately for each channel group. Weather channels There are 10 weather channels.
! IC-M502_4.qxd 02.3.23 9:32 AM 3 Page 8 (1,1) BASIC OPERATION ■ Receiving and transmitting CAUTION: Transmitting without an antenna may damage the transceiver. q Push [POWER] 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 To change the channel group, push [CH/WX•DW•U/I/C] while pushing [HI/LO]. (p.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 9 (1,1) BASIC OPERATION 3 ■ Call channel programming ■ Channel names The call channel is used to select channel 9, however, you can program your most often-used channels in each channel group for quick recall. Memory channels can be tagged with alphanumeric names of up to 10 characters each. q While pushing [HI/LO], push [CH/WX•DW•U/I/C] one or more times to select the desired channel group (U.S.A., International, Canada) to be programmed.
! IC-M502_4.qxd 02.3.23 9:32 AM 3 Page 10 (1,1) BASIC OPERATION ■ Optional voice scrambler operation Activating the scrambler There are 128 or 32 codes (0 to 127 or 1 to 32) available for programming when the optional UT-98 or UT-112 is installed. In order to understand one another, all transceivers in your group must have the same scramble code. This function may not be available depending on dealer setting. The scrambler function automatically turns OFF when channel 16 or 70 is selected.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 11 (1,1) DUAL WATCH/TRI-WATCH 4 ■ Description ■ Operation Dualwatch monitors channel 16 while you are receiving another channel; tri-watch monitors channel 16 and the call channel while receiving another channel. q Select the desired operating channel. w Select dualwatch or tri-watch in set mode. (p. 31) e Push [CH/WX•DW•U/I/C] for 1 sec. to start dualwatch or tri-watch.
! IC-M502_4.qxd 02.3.23 9:32 AM 5 Page 12 (1,1) SCAN OPERATIONS ■ Scan types Scanning is an efficient way to locate signals quickly over a wide frequency range. The transceiver has priority scan and normal scan. When the weather alert function is in use, the selected weather channel is checked while scanning. (p. 31) 12 Set the tag channels (scanned channel) before scanning. Clear the tag channels which inconveniently stop scanning, such as digital communication use.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 13 (1,1) SCAN OPERATION 5 ■ Setting tag channels ■ Starting a scan For more efficient scanning, add desired channels as tag channels or clear tag channels for unwanted channels. Channels set as non-tag channels will be skipped during scanning. Tag channels can be assigned to each channel group (U.S.A., International, Canada) independently. Set scan type (priority or normal scan) and scan resume timer in advance using set mode. (p.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 14 (1,1) DSC OPERATION ■ MMSI code programming ■ Position and time programming The 9-digit MMSI (DSC self ID) code can be programmed at power ON. A distress call should include the ship’s position and time. If no GPS is connected, your position and UTC (Universal Time Coordinated) time should be input. They are included automatically when a GPS receiver (NMEA0183 ver. 2.0) is connected.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 15 (1,1) DSC OPERATION r Push [DSC/ENT] to set the position and advance to time setting condition. • Push [LO/DX] to abandon the setting and exit the condition. t Rotate the channel selector to select the digit of current UTC time. y Push [CH/WX] to advance the cursor. • Push [SCAN] to move the cursor backward. • Push [HI/LO] to clear the time. u Push [DSC/ENT] to set the time. • Push [LO/DX] to abandon the setting and exit the condition.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 16 (1,1) DSC OPERATION ■ Distress call A distress call should be transmitted if, in the opinion of the Master, the ship or a person is in distress and requires immediate assistance. NEVER USE THE DISTRESS CALL WHEN YOUR SHIP IS NOT IN AN EMERGENCY. A DISTRESS CALL CAN BE USED ONLY WHEN IMMEDIATE HELP IS NEEDED. q Confirm any distress call is not being received. w While lifting up the switch cover, push the [DISTRESS] switch for 5 sec.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 17 (1,1) DSC OPERATION ■ Transmitting DSC calls Transmitting individual call The individual call function allows you to transmit a DSC signal to a specific party only. 6 t Push [DSC/ENT] to transmit the individual call. • Channel 70 is selected and the individual call is transmitted to the selected station. • If channel 70 is busy, the transceiver standbys until the channel becomes clear. • Routine category only is available.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 18 (1,1) DSC OPERATION Transmitting individual acknowledgement Transmit an acknowledgement (‘able to comply’ or ‘unable to comply’) when an individual call for you is received. q Select a desired channel other than channel 70. w Push [DSC/ENT] to select the DSC menu. e Rotate the channel selector to select “INDV ACK” and push [DSC/ENT]. • “INDV ACK” appears after an individual call is received.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 19 (1,1) DSC OPERATION Transmitting all ships call 6 t The all ships call has been transmitted. Large ships use channel 70 as their “listening channel.” When you want to announce a message to these ships, use the “all ships call” function. q Select a desired channel other than channel 70. w Push [DSC/ENT] to select the DSC menu. e Rotate the channel selector to select “All ships” and push [DSC/ENT].
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 20 (1,1) DSC OPERATION Transmitting position request call Transmit a position request call when you want to know your friend’s current position, etc. q Select a desired channel other than channel 70. w Push [DSC/ENT] to select the DSC menu. e Rotate the channel selector to select “POS request” and push [DSC/ENT]. y Push [PTT] or rotate the channel selector to exit the condition.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 21 (1,1) DSC OPERATION ■ Setting the distress information The nature of the distress call should be included in the distress call. q Push [DSC/ENT] to select the DSC menu. w Rotate the channel selector to select “DTRS set” and push [DSC/ENT]. 6 r The position information appears. Set the current position, then push [DSC/ENT]. • Rotate the channel selector to select the character. • Push [CH/WX] to advance the cursor. • Push [SCAN] to move the cursor backward.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 22 (1,1) DSC OPERATION ■ DSC individual ID A total of 40 DSC address ID’s can be programmed and named with up to 10 characters. Programming address ID q Push [DSC/ENT] to select the DSC menu. w Rotate the channel selector to select “Set-up” and push [DSC/ENT]. t Push [DSC/ENT] to program and to exit the condition. Deleting address ID q Push [DSC/ENT] to select the DSC menu. w Rotate the channel selector to select “Set-up” and push [DSC/ENT].
! IC-M502_4.qxd 02.3.23 9:32 AM Page 23 (1,1) DSC OPERATION r Select the desired ID name with the channel selector, then push [DSC/ENT]. 6 ■ Receiving DSC calls Receiving a distress call While monitoring channel 70 and a distress call is received: ➥ Emergency alarm sounds for 2 minutes. • Push any switch to stop the alarm. t Push [DSC/ENT] to delete the address ID; push other switch to exit the condition. ➥ “Received Distress” appears in the display; then, channel 16 is automatically selected.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 24 (1,1) DSC OPERATION Receiving a distress relay acknowledgement While monitoring channel 70 and a distress relay acknowledgement is received: ➥ Emergency alarm sounds for 2 minutes. • Push any switch to stop the alarm. ➥ “Received DTRS RLY ACK” appears in the display; then, channel 16 is automatically selected.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 25 (1,1) DSC OPERATION 6 Receiving a position reply call While monitoring channel 70 and a position reply call (for the area you are in) is received: ➥ “Received POS” appears in the display. Receiving a geographical area call While monitoring channel 70 and a geographical area call (for the area you are in) is received: ➥ Emergency alarm or beeps sound depending on the received category.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 26 (1,1) DSC OPERATION ■ DSC set mode Offset time This item sets the offset time from the UTC (Universal Time Coordinated) time. r Set the offset time from the UTC (Universal Time Coordinated) time, then push [DSC/ENT]. • Rotate the channel selector to select the number, ‘+’ or ‘–.’ • Push [CH/WX] to advance the cursor. • Push [SCAN] to move the cursor backward. • Push [HI/LO] to cancel and exit the condition. q Push [DSC/ENT] to select the DSC menu.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 27 (1,1) DSC OPERATION 6 MMSI code check The 9-digit MMSI (DSC self ID) code can be checked in set mode. q Push [DSC/ENT] to select the DSC menu. w Rotate the channel selector to select “Set-up” and push [DSC/ENT]. e Rotate the channel selector to select ‘MMSI check,’ then push [DSC/ENT]. r Check the 9-digit MMSI (DSC self ID) code. t Push [DSC/ENT] to exit the condition.
! IC-M502_4.qxd 02.3.23 9:32 AM 6 Page 28 (1,1) DSC OPERATION ■ Receive messages The transceiver automatically stores up to 20 distress messages and 20 other messages. The messages can be used as an assistance to the logbook. t Rotate the channel selector to scroll the message. • The stored message has several information and depends on the distress call types. q Push [DSC/ENT] to select the DSC menu. w Rotate the channel selector to select “RCV calls” and push [DSC/ENT].
! IC-M502_4.qxd 02.3.23 9:32 AM Page 29 (1,1) INTERCOM OPERATION ■ Intercom operation 7 • To adjust the HM-127’s speaker output level, push [Y]/[Z] after pushing [VOL]. The optional intercom function allows you to talk to the deck from the cabin. The optional HM-127 REMOTE-CONTROL MICROPHONE is required for intercom operation. Connect an optional HM-127 as described on p. 35. • Transmitting is impossible during intercom operation. • The received signal is muted during intercom operation.
! IC-M502_4.qxd 02.3.23 9:32 AM 8 Page 30 (1,1) SET MODE ■ Set mode programming Set mode is used to change the conditions of the transceiver’s functions: scan mode (normal or priority), scan resume timer, weather alert, dualwatch/tri-watch selection, DSC watch, transceiver’s beep tone, internal speaker (transceiver or HM-127), LCD contrast (transceiver or HM-127), RF attenuation level, scrambler code and scrambler type. • Available functions may differ depending on dealer setting.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 31 (1,1) SET MODE ■ Set mode items Scan mode The transceiver has 2 scan modes: normal scan and priority scan. Normal scan searches all tag channels in the selected channel group. Priority scan searches all tag channels in sequence while monitoring channel 16. 8 Weather alert An NOAA broadcast station transmits a weather alert tone before important weather information.
! IC-M502_4.qxd 02.3.23 9:32 AM 8 Page 32 (1,1) SET MODE DSC watch DSC watch monitors channel 70 while you are receiving another channel. If a distress signal is received on channel 70, the transceiver monitors channel 16 and 70 alternately until the distress signal disappears. If a signal is received on another channel, DSC watch pauses until the signal disappears.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 33 (1,1) SET MODE LCD contrast This item adjusts the contrast of the LCD in 8 steps. 8 Scrambler code When an optional scrambler unit is connected, the scrambler code can be set depending on dealer setting. When the UT-98 or UT-112 is installed, 128 or 32 codes (0 to 127 or 1 to 32) can be selected, respectively. The optional HM-127 has it’s own setting for the LCD contrast.
! IC-M502_4.qxd 02.3.23 9:32 AM 9 Page 34 (1,1) CONNECTIONS AND MAINTENANCE ■ Supplied accessories ■ Antenna The following accessories are supplied: Qty. q Mounting bracket ............................................................ 1 w Microphone hanger (OPC-562) ...................................... 1 e Mic hanger screws (3 × 16) ............................................ 2 r Mounting screws (5 × 20) ............................................... 2 t Flat washers (M5) .........................
! IC-M502_4.qxd 02.3.23 9:32 AM Page 35 (1,1) CONNECTIONS AND MAINTENANCE ■ Connections 9 CAUTION: Transmitting without an antenna may damage the transceiver. r GPS RECEIVER JACK Connects to an optional GPS receiver to input the position data and time data. • An NMEA0183 ver. 2.0 is required for position or time indication, etc. Ask your dealer about the GPS receiver. q DC POWER CONNECTOR Connects the supplied DC power cable from this connector to an external 12 V DC power source.
! IC-M502_4.qxd 02.3.23 9:32 AM 9 Page 36 (1,1) CONNECTIONS AND MAINTENANCE ■ Mounting the transceiver • OVERHEAD MOUNTING Using the supplied mounting bracket The universal mounting bracket supplied with your transceiver allows overhead or dashboard mounting. • Mount the transceiver securely with the 2 supplied screws (M5 × 20) to a surface which is more than 10 mm thick and can support more than 5 kg.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 37 (1,1) CONNECTIONS AND MAINTENANCE Using the optional mounting bracket An optional MB-75 FLUSH MOUNT is available for mounting the transceiver to a flat surface such as an instrument panel. 9 r Attach the clamps on either side of the IC-M502. • Make sure that the clamps align parallel to the IC-M502’s body. CAUTION: KEEP the transceiver and microphone at least 1 meter away from your vessel’s magnetic navigation compass.
! IC-M502_4.qxd 02.3.23 9:32 AM 9 Page 38 (1,1) CONNECTIONS AND MAINTENANCE ■ Optional unit installation CAUTION: DISCONNECT the DC power cable from the transceiver before performing any work on the transceiver. Otherwise, there is danger of electric shock and/or equipment damage. w Remove the 4 screws from the shielding plate, then lift up the shielding plate. e Plug an optional unit to J6 on the MAIN unit as shown below.
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! IC-M502_4.qxd 02.3.23 9:32 AM Page 41 (1,1) CHANNEL LIST 11 NOTE: Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT be lawfully used by the general public in U.S.A. waters.
! IC-M502_4.qxd 02.3.23 9:32 AM 12 Page 42 (1,1) SPECIFICATIONS AND OPTIONS ■ Specifications General • Frequency coverage Transmit Receive • Mode Receiver : 156.025–157.425 MHz 156.050–163.275 MHz : FM (16K0G3E) DSC (16K0G2B) • Channel spacing : 25 kHz • Current drain (at 13.8 V) : TX high 6.0 A max. Max. audio 1.2 A max. • Power supply requirement: 13.8 V DC ±15% • Frequency stability : ±10 ppm (–20°C to +60°C; –4°F to +140°F) • Dimensions : 165(W) × 110(H) × 109.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 43 (1,1) SPECIFICATION AND OPTIONS 12 ■ Options • MB-75 FLUSH MOUNT For mounting the transceiver to a panel. • SP-5 EXTERNAL SPEAKER A large, external speaker for superior audio output. • SP-10 EXTERNAL SPEAKER A compact, external speaker. Features easy installation. • UT-98 VOICE SCRAMBLER UNIT (pgs. 10, 33) • UT-112 VOICE SCRAMBLER UNIT Ensures private communications. 128 or 32 codes are available. Not available in some countries.
! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 44 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Panel description The optional HM-127 remotely controls the IC-M502 and provides an optional intercom function. OPTIONAL w PTT SWITCH [PTT] (pgs. 8, 51) Push and hold to transmit; release to receive. Y]/[Z Z] e CHANNEL UP/DOWN SWITCHES [Y ➥ Push either switch to change the operating channel, set mode contents, etc. (pgs.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 45 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ➥ While pushing [H/L], selects one of 3 regular channels in sequence when pushed. (pgs. 6, 7, 50) • International, U.S.A. and Canadian channels are available for regular channels. ➥ Starts dualwatch or tri-watch when pushed for 1 sec. (pgs. 11, 54) ➥ Stops dualwatch or tri-watch when either is activated. y ATTENUATOR/INTERCOM/SCRAMBLER SWITCH [LO/DX•IC•SCR] ➥ Toggles the attenuator function ON and OFF when pushed momentarily.
! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 46 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Function display ➥ In set mode, indicates the selected condition. (pgs. 30, 55) r VOLUME INDICATOR (p. 51) Appears while audio output level is adjusted. t SQUELCH INDICATOR (p. 51) Appears while noise squelch level is adjusted. y CHANNEL NAME INDICATOR ➥ Channel comment appears (and scrolls) if programmed. (pgs. 9, 56) ➥ In set mode, indicates or scrolls the selected set mode item. (pgs.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 47 (1,1) HM-127 REMOTE-CONTROL MICROPHONE 13 !1 DUAL/TRI WATCH INDICATOR (pgs. 11, 54) “DUAL” appears during dualwatch; “TRI” during tri-watch. ■ HM-127 supplied accessories !2 WEATHER CHANNEL INDICATOR (pgs. 7, 50) ➥ “WX” appears when a weather channel is selected. ➥ “ALT” appears when the weather alert function is in use; flashes when an alert tone is received. Accessories included with the HM-127: Qty. q Connection cable (OPC-1000: 6 m; 20 ft) ................
! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 48 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Installation The optional HM-127 can be connected to the transceiver directly, as well as via the supplied connection cable for longer distance remote operation. The connector of the connection cable can be installed into a cabinet, wall, etc., as a built-in plug. w To use the supplied cable as a wall socket, follow the following steps.
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! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 50 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Channel selection Channel 16 q Push [16] to select channel 16. w Push [CH/WX] to return to the condition before selecting channel 16, or push [Y] or [Z] to select operating channel. U.S.A., International and Canadian channels q Push [CH/WX] to select regular channel. • Push [CH/WX] again, if weather channel appears. w Push [CH/WX•U/I/C], while pushing [H/L], to select channel group. • U.S.A.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 51 (1,1) HM-127 REMOTE-CONTROL MICROPHONE 13 ■ Receiving and transmitting q Push [PWR] to turn power ON. w Push [VOL], then [Y]/[Z] to adjust audio output level. • Push [SQL], then [Y]/[Z] to mute any audio nose, if necessary. e Push [Y]/[Z] to select the desired channel. • When receiving a signal, “ ” appears and audio is emitted from the speaker. • Further adjustment of audio level may be necessary at this point.
! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 52 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Lock functions ■ Display backlighting The lock function electronically locks keys and switches to prevent accidental changes and function access from the microphone. The function display and switches can be backlit for better visibility under low light conditions. And the backlighting condition can be adjusted independently from the transceiver. • All keys, switches and controllers on the transceiver are functional.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 53 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Call channel programming q Push [CH/WX•U/I/C] several times while pushing [H/L] to select the desired channel group (USA, INT, CAN) to be programmed. w Push [16•9] for 1 sec. to select the call channel of the selected channel group. • “CALL” and call channel number appear. e Push [16•9] again for 3 sec. (until long beep changes to 2 short beeps) to enter call channel programming condition.
! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 54 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Starting a scan q Push [CH/WX•U/I/C] several times while pushing [H/L] to select the channel group (USA, INT, CAN), if desired. • When the weather alert function is in use, select the desired weather channel with [CH/WX] and [Y]/[Z]. w Push [SCN] to start priority or normal scan. • “SCAN” appears during normal scan.
! IC-M502_4.qxd 02.3.23 9:32 AM Page 55 (1,1) HM-127 REMOTE-CONTROL MICROPHONE 13 ■ Set mode programming Set mode is used to change the condition of the transceiver’s functions and the microphone’s own functions: • Beep tone “BEEP” ➥ Push [Y] to turn ON, [Z] to turn OFF the beep output.
! IC-M502_4.qxd 02.3.23 9:32 AM 13 Page 56 (1,1) HM-127 REMOTE-CONTROL MICROPHONE ■ Intercom operation ■ Channel names q Push [LO/DX•IC] for 1 sec. to activate the intercom function. q Push [Y]/[Z] to select a channel to program. • “IC” appears in the priority channel readout. • The channel name disappears. w Push [PTT] to talk. •“ ” appears in the channel name indicator. e Release [PTT] to listen. •“ ” appears in the channel name indicator when the transceiver is in talking.
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! IC-M502_4.qxd 02.3.23 9:32 AM Page Z (1,1) Count on us! A-5663H-1EX-r Printed in Japan © 2000 Icom Inc.
