INSTRUCTION MANUAL VHF MARINE TRANSCEIVER iM502A
FOREWORD IMPORTANT Thank you for purchasing this Icom product. The ICM502A VHF MARINE TRANSCEIVER is designed and built with Icom’s state of the art technology and craftsmanship. With proper care, this product should provide you with years of trouble-free operation.
IN CASE OF EMERGENCY NOTE If your vessel requires assistance, contact other vessels and the Coast Guard by sending a distress call on Ch 16. A WARNING STICKER is supplied with the transceiver. To comply with FCC regulations, this sticker must be affixed in such a location as to be readily seen from the operating controls of the radio as in the diagram below. Make sure the chosen location is clean and dry before applying the sticker. (p. 42) USING CHANNEL 16 DISTRESS CALL PROCEDURE 1.
RADIO OPERATOR WARNING Icom requires the radio operator to meet the FCC Requirements for Radio Frequency Exposure. An omnidirectional antenna with gain not greater than 9 dBi must be mounted a minimum W ARN ING of 5 meters (measured from the lowest point of the antenna) vertically above the main deck and all possible personnel. This is the minimum safe separation distance estimated to meet all RF exposure compliance requirements.
TABLE OF CONTENTS FOREWORD ............................................. i IMPORTANT .............................................. i IN CASE OF EMERGENCY ...................... ii NOTE ........................................................ ii RADIO OPERATOR WARNING ............... iii TABLE OF CONTENTS ........................... iv PRECAUTION .......................................... v EXPLICIT DEFINITIONS .......................... v 1 2 3 4 OPERATING RULES .................. 1 PANEL DESCRIPTION..
PRECAUTION RWARNING! NEVER connect the transceiver to an AC BE CAREFUL! The transceiver rear panel will become outlet. This may pose a fire hazard or result in an electric shock. hot when operating continuously for long periods. 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.
OPERATING RULES D 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. D PRIVACY • Information overheard but not intended for you cannot lawfully be used in any way. • Indecent or profane language is prohibited.
2 PANEL DESCRIPTION ■ Front panel !1 !0 o q VOLUME CONTROL [ VOL ] (p. 8) Adjusts the audio level. i Function display Speaker VHF MARINE w POWER KEY [ POWER ] Push to turn the transceiver power ON or OFF. iM502 e SQUELCH CONTROL [ SQL ] (p. 8) Sets the squelch threshold level. DISTRESS r TRANSMIT POWER KEY [ HI/LO ] ➥ Toggles power high or low when pushed. (p. 8) WATERPROOF POWER DSC/ENT SCAN CH/WX POS TAG DW U/I/C q 2 w • Some channels are set to low power only.
PANEL DESCRIPTION y ATTENUATOR/INTERCOM/SCRAMBLER KEY [ LO/DX ] ( IC SCR) ➥ Toggles the Attenuator function ON or OFF when pushed momentarily. (p. 8) • “LOCAL” appears when the Attenuator is in use. The order of indication precedence is “SP OFF,” “LOCAL” and “CALL.” ➥ Activates an optional Intercom function when pushed for 1 sec. (p. 36) ➥ Calls optional HM-127 REMOTE-CONTROL MICROPHONE when pushed and held while in Intercom mode. (p.
2 PANEL DESCRIPTION ■ Function display o q w e r q BUSY/TRANSMIT INDICATOR (p. 8) ➥ “BUSY” appears when receiving a signal or when the squelch opens. ➥ “TX” appears while transmitting. i BUSY INT 25W CALL TAG SC DUP CALLING t y w POWER INDICATOR (p. 8) ➥ “25W” appears when high power is selected. ➥ “1W” appears when low power is selected. u e TAG CHANNEL INDICATOR (p. 13) Appears when a tag channel is selected. r CHANNEL COMMENT INDICATOR ➥ Channel comment appears if programmed. (p.
PANEL DESCRIPTION 2 ■ Microphone y DUPLEX INDICATOR (p. 7) Appears when a duplex channel is selected. 2 q • Duplex channel has a different TX and RX frequency. u CHANNEL NUMBER READOUT ➥ Indicates the selected operating channel number. “A” appears when a simplex channel is selected. “b” appears when a receive only channel for a Canadian channel group is selected. (p. 7) ➥ In Set mode, indicates the selected condition. (p. 38) i CHANNEL GROUP INDICATOR (p. 7) Indicates whether an International “INT,” U.
3 BASIC OPERATION ■ Channel selection D Channel 16 D Channel 9 (Call channel) 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.
BASIC OPERATION 3 D U.S.A., Canadian and International channels D Weather channels There are 57 U.S.A., 61 Canadian and 57 International channels. These channel groups may be specified for the operating area. There are 10 weather channels. Used for monitoring weather channels from the NOAA (National Oceanographic and Atmospheric Administration) broadcasts.
3 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.
BASIC OPERATION 3 ■ Call channel programming ■ Channel comments Call channel is used to select Channel 9 (default), however, you can program the call channel with your most often-used channels in each channel group for quick recall. Memory channels can be labeled with alphanumeric comments 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. w Push [ 16 9 ] for 1 sec.
3 BASIC OPERATION ■ Optional Voice scrambler operation D Activating the Scrambler D Programming scrambler codes The optional Voice scrambler provides private communications. In order to receive or send scrambled transmissions you must first activate the Scrambler function. To activate the function, an optional UT-98 or UT-112 is necessary. See p. 41 for setting the scrambler unit. Ask your dealer for details.
DUALWATCH/TRI-WATCH 4 ■ Description ■ Operation Dualwatch monitors Channel 16 while you are receiving another channel; Tri-watch monitors Channel 16 and call channel while receiving another channel. q Select Dualwatch or Tri-watch in Set mode. (p. 39) w Select the desired operating channel. e Push [ CH/WX ] ( DW U/I/C) for 1 sec. to start Dualwatch or Tri-watch. 3 4 • “DUAL” appears during Dualwatch; “TRI” appears during Triwatch. • A beep tone sounds when a signal is received on Channel 16.
5 SCAN OPERATION ■ 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. 39) PRIORITY SCAN CH 01 CH 02 CH 16 CH 05 CH 03 CH 04 Priority scan searches through all tag channels in sequence while monitoring Channel 16.
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 not tagged 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.
6 DSC OPERATION ■ MMSI code programming The 9-digit MMSI (Maritime Mobile Service Identity: DSC self ID) code can be programmed at power ON. This function is not available when the MMSI code has been programmed by the dealer. This code programming can be performed only twice. q Turn power OFF. w While pushing [ DSC/ENT ] , turn power ON to enter MMSI code programming condition. e After the display appears, release [ DSC/ENT ] . Set MMSI ä23456789 r Edit the specific MMSI code by rotating [ CHANNEL ] .
DSC OPERATION r Set the individual ID and ID name. • Edit the 9 digits of the appropriate distress ID by using [ CHAN NEL] NEL] . - Push [ CH/WX ] or [ SCAN ] to move the cursor forward or backward, respectively. 1st digit ‘0’ is fixed for a group ID. Thus an address ID input cannot start with ‘0.’ When you input 1st digit ‘0’ and other 8 digits, the ID is automatically registered as a group ID. Add ID ID:4 NAME: t Push [ DSC/ENT ] to program and exit the condition to the normal operation.
6 DSC OPERATION ■ Position and Time programming 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 manually. They are included automatically when a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected. This manual programming is not available when a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected. q Push [ DSC/ENT ] to enter the DSC menu.
DSC OPERATION 6 ■ Position/Time indication When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected, the transceiver displays the current position and time. When no GPS receiver is connected, the transceiver displays the manually entered position and time. A GPS receiver appropriate for the IC-M502A is not supplied from Icom. A GPS receiver with NMEA0183 ver. 2.0 or 3.01 format is required for position indication. Ask your dealer about suitable GPS receivers.
6 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. Distress Completed Wait for ACK 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. D Simple call q Confirm no Distress call is being received. w While lifting up the switch cover, push [ DISTRESS ] for 5 sec. to transmit the Distress call.
DSC OPERATION D Normal call The nature of the Distress call should be included in the Distress call. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “DTRS Set,” push [ DSC/ENT ] . Sel Item POS Report RCV Calls ˘DTRS Set e Rotate [ CHANNEL ] to select the nature of the distress, push [ DSC/ENT ] .
6 DSC OPERATION y Push [ DISTRESS ] for 5 sec. to transmit the Distress call. Set is OK Push [DTRS] for 5 sec u After transmitting the call, the transceiver waits for an acknowledgment call on Ch 70. • The Distress call is automatically transmitted every 3.5 to 4.5 minutes. Distress Completed Wait for ACK i After receiving the acknowledgment, reply using the microphone. Received Distress ACK < Tokyo CG 20 ➥ A distress alert contains; • Kind of distress : Selected nature of the distress.
DSC OPERATION 6 ■ Transmitting DSC calls D Transmitting Individual call The Individual call function allows you to transmit a DSC signal to a specific ship only. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “Individual,” push [ DSC/ENT ] . Sel Item POS Input ˘Individual Group e Rotate [ CHANNEL ] to select the desired pre-programmed individual address or “Manual Input,” push [ DSC/ENT ] . • The ID code for the Individual call can be set in advance. (p.
6 DSC OPERATION y After transmitting the Individual call, standby on Channel 70 until an acknowledgement is received. Individual Completed Wait for ACK u When the acknowledgement is received, the display changes to the previously selected channel with beeps. Received Able ACK Routine < Tom i Push and hold [ PTT ] to communicate your message to the responding ship.
DSC OPERATION r Rotate [ CHANNEL ] to select an acknowledgement “Able” or “Unable,” push [ DSC/ENT ] . Comply ˘Able Unable t If you select “Unable,” select the reason by rotating [ CHANNEL ] , push [ DSC/ENT ] . 6 u After the Individual acknowledgement has been transmitted, the display changes to the channel specified by the calling station, automatically.
6 DSC OPERATION D Transmitting Group call The Group call function allows you to transmit a DSC signal to a specific group only. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “Group,” [ DSC/ENT ] . • When “Manual Input” is selected, rotate [ CHANNEL] CHANNEL] to select the desired channel other than Channel 70, push [ DSC/ENT] DSC/ENT] .
DSC OPERATION 6 D Transmitting All Ships call 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 Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “All Ships,” push [ DSC/ENT ] . Sel Item INDV ACK Group ˘All Ships r After the All Ships call has been transmitted, the display changes to Channel 16 automatically.
6 DSC OPERATION D Transmitting Position Request call Transmit a Position Request call when you want to know a specific ship’s current position, etc. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “POS Request,” push [ DSC/ENT ] . Sel Item Group All ships ˘POS Request e Rotate [ CHANNEL ] to select the desired pre-programmed individual address or “Manual Input,” push [ DSC/ENT ] . • The ID code for the Position Request call can be set in advance. (p.
DSC OPERATION D Transmitting Position Report call Transmit a Position Report call when you want to announce your own position to a specific ship and to get answer, etc. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “POS Report,” push [ DSC/ENT ] . Sel Item All ships POS Request ˘POS Report e Rotate [ CHANNEL ] to select the desired pre-programmed individual address or “Manual Input,” push [ DSC/ENT ] . • The ID code for the Position Report call can be set in advance. (p.
6 DSC OPERATION y Push [ DSC/ENT ] to transmit the Position Report call. To Call, [DSC/ENT] To Cancel [other] u After the Position Report call has been transmitted, the following indication is displayed POS Report Completed Wait for ACK i Push any key to exit the condition and return to the normal operation. D Transmitting Position Reply call Transmit a Position Reply call when a Position Request call is received. q When a Position Request call is received, the following indication is displayed.
DSC OPERATION ■ Receiving DSC calls D Receiving a Distress call While monitoring Channel 70 and a Distress call is received: ➥ The emergency alarm sounds for 2 minutes. • Push any key to stop the alarm. ➥ “Received Distress” appears in the display; then Channel 16 is automatically selected. ➥ Continue monitoring Channel 16 as a coast station may require assistance.
6 DSC OPERATION D Receiving an All Ships call D Receiving a Distress Relay acknowledgement While monitoring Channel 70 and an All Ships call is received: ➥ Emergency alarm sounds when the category is ‘Distress’ or ‘Urgency’; 3 beeps sound for other categories. ➥ “Received All ships” appears in the display. While monitoring Channel 70 and a Distress Relay acknowledgement is received: ➥ Emergency alarm sounds for 2 minutes.
DSC OPERATION 6 D Receiving a Position Request call D Receiving a Position Report call While monitoring Channel 70 and a Position Request call is received: ➥ “Received POS Request” appears in the display. While monitoring Channel 70 and a Position Report call is received: ➥ “Received POS Report” appears in the display. Received POS Request < Ricky Ans[DSC/ENT] ➥ Push [ DSC/ENT ] to reply to the Position Request call; push other key to ignore the Position Request call.
6 DSC OPERATION ■ Received 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. q Push [ DSC/ENT ] to select the DSC menu. w Rotate [ CHANNEL ] to select “RCV Calls,” push [ DSC/ENT ] . Sel Item ˘RCV Calls DTRS Set Set up D Distress message q Rotate [ CHANNEL ] to select “Distress,” push [ DSC/ENT ] . Sel Messege ˘Distress Other w Rotate [ CHANNEL ] to scroll to the desired message, push [ DSC/ENT ] .
DSC OPERATION 6 D Other messages q Rotate [ CHANNEL ] [ DSC/ENT ] . to select “Other,” push Sel Messege Distress ˘Other w Rotate [ CHANNEL ] to scroll to the desired message, push [ DSC/ENT ] . • When some messages are blinking, the messages have not been read. Sel Messege All Ships ˘Individual POS Request e Rotate [ CHANNEL ] to scroll the message. • The stored message has various information and depending on the type of distress calls.
6 DSC OPERATION ■ DSC Set mode r Set the offset time from the UTC (Universal Time Coordinated) time. D Add Address ID (See p.14 for detail) D Delete Address ID (See p.15 for detail) D Offset time This item sets the offset time from the UTC (Universal Time Coordinated) time. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “Set [ DSC/ENT ] . up,” push Sel Item RCV Calls DTRS Set ˘Set up e Rotate [ CHANNEL ] to select “Offset time,” push [ DSC/ENT ] .
DSC OPERATION 6 D MMSI code check The programmed 9-digit MMSI (DSC self ID) code can be checked in DSC Set mode. q Push [ DSC/ENT ] to enter the DSC menu. w Rotate [ CHANNEL ] to select “Set [ DSC/ENT ] . up,” push Sel Item RCV Calls DTRS Set ˘Set up 6 e Rotate [ CHANNEL ] to select “MMSI Check,” push [ DSC/ENT ] . Set up Delete ID Offset Time ˘MMSI Check r Check the 9-digit MMSI (DSC self ID) code. MMSI Check 123456789 t Push [ DSC/ENT ] to exit the DSC menu.
7 OTHER FUNCTIONS ■ Intercom operation 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. INT INT Intercom TALK 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/DX] LO/DX] ( IC SCR) for 1 sec. to enter Intercom mode.
OTHER FUNCTIONS 7 ■ Microphone lock function ■ Display backlighting The Microphone lock function electrically locks the [ Y ] /[ Z ] and [ 16/9 ] keys on the supplied microphone. This prevents accidental channel changes and accidental function access. The function display and keys can be backlit for better visibility under low light conditions. ➥ While pushing [ 16/9 ] on supplied microphone, turn power ON to toggle the Lock function ON or OFF.
8 SET MODE ■ Set mode programming q Turn power OFF. w While pushing [ 16 9 ] , turn power ON to enter Set mode. e After the display appears, release [ 16 9 ] . r Push [ 16 9 ] to select the desired item. Or push [ 16 ] ( 9 ) on the HM-127 to select the item when using an optional HM-127. t Rotate [ CHANNEL ] to select the desired condition of the item. Use [ Y ] /[ Z ] when using an optional HM-127. y Turn power OFF, then turn ON again to exit Set mode.
SET MODE 8 ■ Set mode items D Scan mode D Weather alert 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. A NOAA broadcast station transmits a Weather alert tone before important weather information.
8 SET MODE D DSC watch D Internal speaker 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. When an external speaker is connected and the transceiver’s internal speaker is not required, the speaker on the transceiver and microphone can be deactivated.
SET MODE D Attenuation level This item sets the receive attenuation level for the Attenuator function from 3 levels. Set Mode Attenuation Level 8 D Scrambler type (Appears when a scrambler unit is installed) When an optional scrambler unit is installed, the scrambler type can be selected in Set mode depending on dealer setting.
9 CONNECTIONS AND MAINTENANCE ■ Supplied accessories ■ Antenna The following accessories are supplied: Qty. q Mounting bracket ............................................................ 1 w Microphone hanger ......................................................... 1 e Mic hanger screws (3 × 16) ............................................ 2 r Mounting screws (5 × 20) ............................................... 4 t Flat washers (M5) ...........................................................
CONNECTIONS AND MAINTENANCE ■ Connections q t r e w q DC POWER CONNECTOR Connects the supplied DC power cable from this connector to an external 13.8 V DC power source. w EXTERNAL MICROPHONE JACKS Connects to optional HM-127 REMOTE-CONTROL MICROPHONE. CAUTION: NEVER connect other microphones, such as the HM-134, as this may cause damage to the transceiver. e ANTENNA CONNECTOR Connects a marine VHF antenna with a PL-259 connector.
9 CONNECTIONS AND MAINTENANCE ■ Mounting the transceiver D Using the supplied mounting bracket • OVERHEAD MOUNTING The universal mounting bracket supplied with your transceiver allows overhead or onboard mounting. • Mount the transceiver securely with the 4 supplied screws (M5 × 20) to a surface which is more than 10 mm thick and can support more than 5 kg. • Mount the transceiver so that the face of the transceiver is at 90° to your line of sight when operating it.
CONNECTIONS AND MAINTENANCE D Using the optional MB-75 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-M502A. • Make sure that the clamps align parallel to the IC-M502A’s body. CAUTION: KEEP the transceiver and microphone at least 1 meter away from your vessel’s magnetic navigation compass.
9 CONNECTIONS AND MAINTENANCE ■ Optional unit installation e Plug an optional unit (UT-98 or UT-112) to J3 on the MAIN unit as shown below. 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. Follow the case opening procedure shown here when you want to install an optional unit. Optional unit q Remove the 6 screws as shown below and open the transceiver.
CONNECTIONS AND MAINTENANCE 9 ■ Dimensions 109.4 (4 5⁄16) 145.0 (5 23⁄32) 110.0 (4 11⁄32) 9 165.0 (6 1⁄2) 31.4 (1 1⁄4) 53.
10 TROUBLESHOOTING PROBLEM 48 POSSIBLE CAUSE SOLUTION REF. No power comes ON. • Bad connection to the power supply. • Check the connection to the transceiver. No sound comes from the speaker. • Squelch level is too high. • Volume level is too low. • Speaker has been exposed to water. • Internal speaker is turned OFF. • Set squelch to the threshold point. p. 8 • Set [VOL] to a suitable level. p. 8 • Drain water from the speaker. — • Turn the internal speaker ON in Set mode. p.
CHANNEL LIST 11 Channel number Frequency (MHz) Channel number Frequency (MHz) Channel number Frequency (MHz) Channel number Frequency (MHz) USA INT CAN Transmit Receive USA INT CAN Transmit Receive USA INT CAN Transmit Receive USA INT CAN Transmit Receive 156.050 160.650 19A 64A 83A 156.050 156.050 20 20A 01 01 01A 02 02 156.100 160.700 03 03 156.150 160.750 03A 156.150 156.150 04 156.250 160.850 21 06 22A 23 21A 157.050 157.050 66A 66A 66A† 156.325 156.325 21b Rx only 161.
12 SPECIFICATIONS AND OPTIONS ■ Specifications D General • Frequency coverage Transmit Receive • Mode D Transmitter : 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 5.5 A max. Max. audio 1.5 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.
SPECIFICATIONS 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/ UT-112 VOICE SCRAMBLER UNIT (pgs. 10, 41) Ensures private communications. 128 (for UT-98) or 32 (for UT-112) codes are available. Not available in some countries. • HM-127 REMOTE-CONTROL MICROPHONE (p.
13 HM-127 REMOTE-CONTROL MICROPHONE OPTION ■ Panel description The optional HM-127 remotely controls the IC-M502A and provides an optional Intercom function. D Front and side keys Top keys q w e u y t r q PTT SWITCH [ PTT ] (pgs. 8, 57) Push and hold to transmit; release to receive. w CHANNEL UP/DOWN KEYS [ Y ] /[ Z ] ➥ Push either key to change the operating channel, Set mode settings, etc. (pgs.
HM-127 REMOTE-CONTROL MICROPHONE r CHANNEL/DUALWATCH/TRI-WATCH KEY [ CH/WX ] ( DW U/I/C) ➥ Selects and toggles the regular channels and weather channel when pushed momentarily. (pgs. 6, 7, 56) ➥ While pushing [ H/L ] , selects one of 3 regular channels in sequence when pushed. (pgs. 7, 56) • International, U.S.A. and Canadian channels are available for regular channels. ➥ Starts Dualwatch or Tri-watch when pushed for 1 sec. (pgs. 11, 60) ➥ Stops Dualwatch or Tri-watch when either is activated.
13 HM-127 REMOTE-CONTROL MICROPHONE ■ Function display D Top keys q PWR TAG SCAN H/L !8 !7 e w q q POWER KEY [PWR] (pgs. 8, 57) Push for 2 sec. to turn the HM-127 power ON or OFF when the IC-M502A power is turned ON. w SCAN KEY [ SCAN ] ( TAG ) (pgs. 13, 61) ➥ Starts and stops Normal or Priority scan when tag channels are programmed. ➥ Push [ SCAN] SCAN] ( TAG ) for 1 sec. to set the displayed channel as a tag (scanned) channel. ➥ While pushing [ H/L ] , push for 3 sec.
HM-127 REMOTE-CONTROL MICROPHONE e CHANNEL NUMBER READOUT ➥ Indicates the selected operating channel number. “A” appears when a simplex channel is selected. “b” appears when a receive only channel for a Canadian channel group is selected. (pgs. 6, 56) ➥ In Set mode, indicates the selected condition. (pgs. 38, 62) r VOLUME INDICATOR (p. 57) Appears while audio output level is adjusted. t SQUELCH INDICATOR (p. 57) Appears while noise squelch level is adjusted.
13 HM-127 REMOTE-CONTROL MICROPHONE ■ Channel selection D Channel 16 D U.S.A., International and Canadian channels 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 an operating channel. q Push [ CH/WX ] ( DW • Push [ CH/WX] CH/WX] ( DW U/I/C) U/I/C) to select a regular channel. again, if a weather channel appears. w While pushing [ H/L ] , push [ CH/WX] CH/WX] ( DW channel group. U/I/C) to select a • U.
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] SQL] , then push [ Y ] /[[Z ] to mute any audio noise, 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 the audio level may be necessary at this point. • Use the optional Voice scrambler function for privacy. (pgs.
13 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 keys can be backlit for better visibility under low light conditions. The backlighting condition can also be adjusted independently from the transceiver. • All keys, switches and controllers on the transceiver are functional.
HM-127 REMOTE-CONTROL MICROPHONE ■ Monitor function ■ Call channel programming The monitor function releases the noise squelch mute of the microphone only. (An independent noise squelch system is employed.) q Push [ CH/WX ] ( DW U/I/C) several times while pushing [ H/L ] to select the desired channel group (USA, INT, CAN) to be programmed. ➥ Push [ SQL ] ( MONI L) for 1 sec. Blinks when the Monitor to activate the Monitor funcfunction is in use. tion. •“ ” blinks and audio is emitted.
13 HM-127 REMOTE-CONTROL MICROPHONE ■ Optional Voice scrambler operation ■ Dualwatch/Tri-watch operation D Activating the Scrambler q Push [ Y ] /[ Z ] to select the desired channel. • Push [ CH/WX] CH/WX] ( DW U/I/C) several times while pushing [ H/L ] to select the channel group (USA, INT, CAN), if desired. q Select an operating channel, except for Channel 16, Channel 70 or weather channels. w While pushing [ H/L ] , push [ LO/DX] LO/DX] ( IC SCR) to turn the Voice scrambler function ON.
HM-127 REMOTE-CONTROL MICROPHONE 13 ■ Starting a scan ■ Setting tag channels q While pushing [ H/L ] , push [ CH/WX ] ( DW U/I/C) several times to select the channel group (USA, INT, CAN), if desired. q While pushing [ H/L ] , push [ CH/WX ] ( DW U/I/C) several times to select the channel group (USA, INT, CAN), if desired. w Push [ Y ] /[ Z ] to select the desired channel to set as a tag channel. e Push [ SCAN] SCAN] ( TAG ) for 1 sec. to set the displayed channel as a tag channel.
13 HM-127 REMOTE-CONTROL MICROPHONE ■ Set mode programming Set mode is used to change the condition of the transceiver’s functions and the microphone’s own functions: Transceiver’s functions— scan mode (Normal or Priority), scan resume timer, weather alert, Dualwatch/Tri-watch, DSC watch, transceiver’s beep tone, internal speaker (transceiver), LCD contrast (transceiver), RF attenuation level, scrambler code, scrambler type and automatic acknowledgement.
HM-127 REMOTE-CONTROL MICROPHONE 13 ■ Intercom operation ■ Channel comments q Push [ LO/DX] LO/DX] ( IC SCR) for 1 sec. to activate the Intercom function. q Push [ Y ] /[ Z ] to select a channel to program a channel comment. • “IC” appears in the priority channel readout. • The channel comment disappears. • Push [ CH/WX] CH/WX] ( DW U/I/C) several times while pushing [ H/L] H/L] to select the channel group (USA, INT, CAN), if desired. w While pushing [ H/L ] , push [ 16 ] ( 9 ) .
13 HM-127 REMOTE-CONTROL MICROPHONE ■ HM-127 supplied accessories Accessories included with the HM-127: Qty. q Connection cable (OPC-1000: 6 m; 20 ft) ...................... 1 w Mounting base ................................................................ 1 e Microphone hanger ........................................................ 1 r Screws (M3 × 16; tapping) .............................................
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. For longer distance remote operation, the optional extension cable, OPC-999 (6 m; 20 ft/connecting between transceiver and the connection cable), is available, and up to 2 OPC-999 can be added.
13 HM-127 REMOTE-CONTROL MICROPHONE Mounting base 5 mm; 3⁄16˝ 3 32 50 (d) mm; 131⁄32˝ 23 (d) mm; 29⁄32˝ 24 to 27 (d) mm (15⁄16 to 11⁄16˝) 2 mm; ⁄ ˝ Nut Gasket 66 Cap
TEMPLATE 165 mm (61⁄2 in) 149 mm (57⁄8 in) MB-75 Cut here 110 mm (411⁄32 in) 24 to 27 (d) mm (15⁄16 to 11⁄16 in) 92 mm (35⁄8 in) HM-127 4–R11 2 mm; 3⁄32 in
A-6301H-1EX Printed in Japan © 2003 Icom Inc.
