Icom IC-M304 Instruction Manual Download Page 43

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SPECIFICATIONS AND OPTIONS

■

Specifications

General

• Frequency coverage

: Transmit 156.025–157.425 MHz

Receive 156.050–163.275 MHz

• Mode

: FM (16K0G3E)

DSC (16K0G2B)

• Channel spacing

: 25 kHz

• Current drain (at 13.8 V)

: TX (at 25 W)

5.5 A max.

Max. audio

1.5 A max.

• Power supply requirement

: 13.8 V DC ±15%

• Frequency stability

: ±10 ppm

• Operating temperature range: –20°C to +60°C; –4°F to +140°F
• Dimensions

: 153(W)

67(H)

133(D) mm

(Projections not included)

⁄

(W)

⁄

(H)

⁄

(D) in

• Weight

: Approx. 825 g ; 1.8 lb

Transmitter

• Output power

: 25 W (High) and 1 W (Low)

• Modulation system

: Variable reactance frequency modu-

lation

• Max. frequency deviation

: ±5.0 kHz

• Spurious emissions

: Less than –70 dBc (High)

Less than –56 dBc (Low)

• Adjacent channel power

: More than 70 dB

Receiver

• Receive system

: Double conversion

superheterodyne

• Sensitivity (12 dB SINAD)

: 0.22 µV (typical)

• Squelch sensitivity

: Less than 0.22µV

• Intermodulation rejection ratio

: More than 70 dB

• Spurious response rejection ratio : More than 70 dB
• Adjacent channel selectivity

: More than 70 dB

• Audio output power

: 4.5 W (typical) at 10%

distortion with a 4

Ω

load

All stated specifications are subject to change without notice or
obligation.

Summary of Contents for IC-M304

Page 1: ...INSTRUCTION MANUAL iM304 VHF MARINE TRANSCEIVER ...

Page 2: ...lly and completely before using the transceiver SAVE THIS INSTRUCTION MANUAL This in struction manual contains important operating instructions for the IC M304 EXPLICIT DEFINITIONS WORD DEFINITION R WARNING CAUTION NOTE Personal injury fire hazard or electric shock may occur Equipment damage may occur Recommended for optimum use No risk of personal injury fire or electric shock CLEAN THE TRANSCEIV...

Page 3: ...lying the sticker p 32 EXAMPLE WARNING STICKER USING DIGITAL SELECTIVE CALLING Ch 70 DISTRESS CALL PROCEDURE 1 While opening the key cover push and hold DISTRESS for 5 sec until you hear 5 short beeps change to one long beep 2 Wait for an acknowledgment from a coast station Channel 16 is automatically selected 3 Push and hold PTT then transmit the appropriate information as listed above USING CHAN...

Page 4: ... with radio and antenna when persons are within the MPE radius of the antenna unless such persons such as driver or radio operator are shielded from antenna field by a grounded metallic barrier The MPE Radius is the minimum distance from the antenna axis that person should maintain in order to avoid RF exposure higher than the allow able MPE level set by FCC WARNING FAILURE TO OBSERVE THESE LIMITS...

Page 5: ...0 Setting TAG channels 11 Starting a scan 11 5 DUALWATCH TRI WATCH 12 Description 12 Operation 12 6 DSC OPERATION 13 27 MMSI code programming 13 MMSI code check 13 DSC address ID 14 Position indication 15 Distress call 16 Transmitting DSC calls 17 Receiving DSC calls 24 7 SET MODE 28 30 Set mode programming 28 Set mode items 29 8 CONNECTIONS AND MAINTENANCE 31 34 Connections 31 Supplied accessorie...

Page 6: ...injury KEEP the transceiver at least 3 3 ft 1 m away from the ship s navigation compass DO NOT use or place the transceiver in areas with temper atures below 4 F 20 C or above 140 F 60 C or in areas subject to direct sunlight such as the dashboard AVOID the use of chemical agents such as benzine or al cohol when cleaning as they may damage the transceiver surfaces BE CAREFUL The transceiver rear p...

Page 7: ...r radio purposes 2 OPERATOR S LICENSE A Restricted Radiotelephone Operator Permit is the license most often held by small vessel radio operators when a radio is not required for safety purposes The Restricted Radiotelephone Operator Permit must be posted or kept with the operator Only a licensed radio opera tor may operate a transceiver However non licensed individuals may talk over a transceiver ...

Page 8: ...lch threshold level r CHANNEL 16 CALL CHANNEL KEY 6 9 Push to select Channel 16 p 5 Push and hold for 1 sec to select call channel p 5 CALL appears when the call channel is selected Push and hold for 3 sec to enter call channel program ming condition when the call channel is selected p 8 While pushing and holding CH WX push to enter the channel comments programming condition p 8 Push to move the c...

Page 9: ...i DSC POSITION KEY DSC POS Push to enter DSC menu p 13 Push and hold for 1 sec to show the current position from a GPS receiver p 15 Microphone q PTT SWITCH PTT Push and hold to transmit release to receive p 7 w CHANNEL UP DOWN KEYS Y Y Z Z Push either key to change the operating channel Set mode settings etc pgs 5 6 28 When the Favorite channel function is turned ON push either key to select the ...

Page 10: ...nnel is selected WX ALT appears when the Weather alert function is in use blinks when an alert tone is received i DSC INDICATORS DSC appears when a DSC call is received p 24 POS REPLY appears when a Position Reply call or Position Report Reply call is received p 27 o CHANNEL COMMENT INDICATOR Channel comment appears if programmed p 8 scrolls when the battery voltage drops to approx 10 8 V DC or be...

Page 11: ...avorite channels in the selected channel group in sequence when pushed The favorite channels are set by the TAG channel setting p 11 ï ï Channel 9 Call channel Each regular channel group has a separate leisure use call channel The call channel is monitored during Tri watch The call channels can be programmed p 8 and are used to store your most often used channels in each channel group for quick re...

Page 12: ...e Push Y or Z to select a channel appears for duplex channels ï ï Weather channels The IC M304 has 10 pre programmed weather channels These are used for monitoring broadcasts from NOAA Na tional Oceanic and Atmospheric Administration The transceiver can automatically detect a weather alert tone on the selected weather channel while receiving the channel or during scanning p 29 q Push CH WX once or...

Page 13: ...cessary LOW appears when low power is selected Choose low power for short range communications choose high power for longer distance communications Some channels are for low power only y Push and hold PTT to transmit then speak into the mi crophone appears Channel 70 cannot be used for transmission other than DSC u Release PTT to receive Simplex channels 3 21 23 61 64 81 82 and 83 CAN NOT be lawfu...

Page 14: ...el as the call channel Push CH WX to cancel The channel number stops blinking Channel comments Memory channels can be labeled with a unique alphanumeric ID of up to 10 characters each More than 6 characters comment scrolls automatically at the channel comment indicator after the channel selection Capital letters small letters except f j k p s v x z 0 to 9 some symbols and space can be used q Selec...

Page 15: ...htness of the LCD and key backlight The backlight is selectable in 3 levels and OFF AquaQuake water draining function The IC M304 uses a new technology to clear water away from the speaker grill AquaQuake AquaQuake helps drain water away from the speaker housing water that might oth erwise muffle the sound coming from the speaker The IC M304 emits a vibrating noise when this function is being used...

Page 16: ...se Refer to the right page for details Choose Priority or Normal scan in Set mode p 29 PRIORITY SCAN Priority scan searches through all TAG channels in se quence while monitoring Channel 16 When a signal is de tected on Channel 16 scan pauses until the signal disap pears when a signal is detected on a channel other than Channel 16 scan becomes Dualwatch until the signal dis appears CH 06 CH 01 CH ...

Page 17: ...he selected channel group Repeat above procedure to set all TAG channels Starting a scan Set scan type Priority or Normal scan and scan resume timer in advance using Set mode p 29 q Push U I C both Y and Z several times to select the desired channel group if desired w Set TAG channels as described at left e Make sure the squelch is closed to start a scan r Push SCAN to start Priority or Normal sca...

Page 18: ...ch A beep tone sounds when a signal is received on Channel 16 r To cancel Dualwatch or Tri watch push DUAL CH WX DUALWATCH TRI WATCH SIMULATION If a signal is received on Channel 16 Dualwatch Tri watch pauses 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 chan...

Page 19: ...sor starts blinking r Edit the specified MMSI code by pushing Y or Z Push 6 or CH WX to move the cursor forward or backward respectively t Input 9 digit code then push DSC to set the code Returns to the normal operation MMSI code check The 9 digit MMSI DSC self ID code can be checked q Push DSC to enter the DSC menu w Push Y or Z to select and push DSC e Check the 9 digit MMSI DSC self ID code The...

Page 20: ...riate address ID Push 6 or CH WX to move the cursor forward or backward respectively Push SCAN to cancel and exit the condition 1st digit 0 is fixed for a group ID When you input 1st digit 0 and other 8 digits the ID is automatically registered as a group ID t After inputting 9 digit ID push DSC to input 5 characters ID name using Y or Z Push 6 or CH WX to move the cursor forward or backward respe...

Page 21: ...1 is con nected the transceiver indicates the current position data in seconds of accuracy A NMEA0183 ver 2 0 or 3 01 sentence formatters RMC GGA GNS GLL compatible GPS receiver is required Ask your dealer about suitable GPS receivers Push and hold POS DSC for 1 sec to display the cur rent position Latitude and Longitude scroll in sequence at the channel com ment indicator scrolls when no GPS is c...

Page 22: ...ll is transmitted e After transmitting the call the transceiver waits for an ac knowledgment call on Channel 70 The Distress call is automatically transmitted every 3 5 to 4 5 minutes scrolls at the channel comment indicator r After receiving the acknowledgment reply using the mi crophone scrolls at the channel comment indicator A distress alert contains Kinds of distress Undesignated distress Pos...

Page 23: ...C to select the desired pre programmed individ ual address using Y or Z then push DSC The ID code for the individual call must be set in advance p 14 e Push Y or Z to select a desired intership channel push DSC Intership channels are already preset into the transceiver in rec ommended order Channel 70 is selected and appears after pushing DSC r Push DSC to transmit the Individual call If Channel 7...

Page 24: ...age to the responding ship when Able to comply is received D Transmitting Individual acknowledgement When receiving an Individual call you can transmit an ac knowledgement Able to comply or Unable to comply by using the on screen prompts see page 25 for details You can also send an acknowledgement through the menu sys tem as follows q Push DSC to enter the DSC menu w Push Y or Z to select and push...

Page 25: ... has been transmit ted the display changes to the channel specified by the calling station automatically when is selected D Transmitting Group call The Group call function allows you to transmit a DSC signal to a specific group only q Push DSC to enter the DSC menu w Push Y or Z to select and push DSC e Push Y or Z to select the desired pre programmed group address and push DSC The ID code for the...

Page 26: ...call If Channel 70 is busy the transceiver stands by until the channel becomes clear Routine category only is available y After the Group call has been transmitted the display changes to the previously specified channel u Push and hold PTT to communicate your message to the responding ship Scrolls While transmitting 20 6 DSC OPERATION ...

Page 27: ...ion q Push DSC to enter the DSC menu w Push Y or Z to select e Push DSC to enter the standby condition for All Ships call Channel 70 is selected and appears r Push DSC to transmit the All Ships call Routine category only is available Low power is selected t After the All Ships call has been transmitted the display changes to Channel 16 automatically Scrolls While transmitting Scrolls ...

Page 28: ...in dividual address The ID code for position request must be set in advance p 14 r Push DSC to enter the standby condition for Position Re quest call Channel 70 is selected and appears t Push DSC to transmit the Position Request call y After the Position Request call has been transmitted the following indication is displayed scrolls at the channel comment indicator u Push any key to exit the condi...

Page 29: ...in dividual address The ID code for the position report call can be set in advance p 14 r Push DSC to enter the standby condition for Position Re port call Channel 70 is selected and appears t Push DSC to transmit the Position Report call y After the Position Report call has been transmitted stand by on Channel 70 until an acknowledgement is received scrolls at the channel comment indicator u Push...

Page 30: ...ing a Distress acknowledgement While monitoring Channel 70 and a Distress acknowledge ment to other ship is received The emergency alarm sounds Push any key to stop the alarm DSC appears and scrolls at the chan nel comment indicator then Channel 16 is automatically selected D Receiving a Distress Relay call While monitoring Channel 70 and a Distress Relay acknowl edgement is received The emergency...

Page 31: ...oice communication depending on your replying con dition see p 18 for individual acknowledgement call pro cedure for details push any other key to ignore the Indi vidual call D Receiving a Group call While monitoring Channel 70 and a Group call is received The emergency alarm or beeps sound depending on the received category DSC appears and scrolls at the channel comment indicator Push any key to ...

Page 32: ...l While monitoring Channel 70 and a Geographical Area call for the area you are in is received The emergency alarm or beeps sound depending on the received category DSC appears and scrolls at the chan nel comment indicator Push any key to stop the beep then push DSC to change to the channel specified by the calling station for voice communication push any other key to ignore the Geo graphical Area...

Page 33: ...yed and scrolled automatically in order of Latitude co ordinates and then Longitude co ordinates after replying the call D Receiving a Position Reply call While monitoring Channel 70 and a Position Reply call is re ceived DSC and POS REPLY appear in the display The Latitude and Longitude from the called station is displayed and scrolled automatically in order of Latitude co ordinates and then Long...

Page 34: ...ng D Set mode operation q Turn power OFF w While pushing 6 turn power ON to enter Set mode e After the display appears release 6 appears at the channel comment indicator r Push 6 to select the desired item if necessary t Push Y or Z to select the desired condition of the item y Turn power OFF then ON again to exit Set mode Beep tone Starting item Scan type Scan resume timer Weather alert Dual Tri ...

Page 35: ...al has been re ceived on any other channel than Channel 16 D D Weather alert A NOAA broadcast station transmits a weather alert tone be fore important weather information When the weather alert function is turned ON the transceiver detects the alert then the WX ALT indicator blinks until the transceiver is operated The previously selected used weather channel is checked any time while scanning WX ...

Page 36: ... D Automatic acknowledgement This item sets the Automatic acknowledgement function ON or OFF When Position Request call or Position Report call is re ceived transceiver automatically transmits Position Request Reply call or Position Report Reply call respectively scrolls at the channel comment indicator D D Favorite channel This item sets the Favorite channel function ON or OFF The favorite channe...

Page 37: ...Connects the supplied DC power cable from this connector to an external 13 8 V DC power source CAUTION After connecting the DC power cable GPS receiver lead and external speaker lead cover the con nector and leads with an adhesive tape as shown below to prevent water seeping into the transceiver r ANTENNA CONNECTOR Connects a marine VHF antenna with a PL 259 connector to the transceiver CAUTION Tr...

Page 38: ...ower cable If a fuse blows or the transceiver stops functioning track down the source of the problem if possible and replace the damaged fuse with a new rated one Cleaning If the transceiver becomes dusty or dirty wipe it clean with a soft dry cloth AVOID the use of solvents such as benzene or al cohol as they may damage transceiver surfaces Mounting bracket For mounting bracket Knob bolts Screws ...

Page 39: ...o that the face of the transceiver is at 90 to your line of sight when operating it CAUTION KEEP the transceiver and microphone at least 1 meter away from your vessel s magnetic navigation com pass NOTE Check the installation angle the function display may not be easy to read at some angles Optional MB 92 attachment An optional MB 92 DUST COVER is available for attaching the transceiver s front pa...

Page 40: ...an to mount the trans ceiver w Slide the transceiver through the hole as shown below e Attach the clamps on either side of the transceiver with 2 supplied bolts 5 8 mm Make sure that the clamps align parallel to the transceiver body r Tighten the end bolts on the clamps rotate clockwise so that the clamps press firmly against the inside of the in strument control panel t Tighten the locking nuts r...

Page 41: ... the connection to the transceiver Transmitting is impossi ble or high power can not be selected Some channels are for low power or re ceive only The output power is set to low pgs 5 6 36 p 7 Change channels Push HI LO on the microphone to select high power Scan does not start TAG channel is not programmed Set the desired channels as TAG channels p 11 No beeps Beep tones are turned OFF Turn the be...

Page 42: ...56 075 156 075 156 125 160 725 62 62A 156 125 156 125 156 175 160 775 63 63A 156 175 156 175 64 156 225 160 825 64 64A 64A 156 225 156 225 156 275 160 875 65 65A 65A 156 275 156 275 65A 156 325 160 925 66 66A 66A 1 156 325 156 325 66A 67 2 67 156 375 156 375 67 21A 21A 157 050 157 050 USA 21 157 050 161 650 21 CAN Transmit Receive INT Channel number Frequency MHz 71 71 156 575 156 575 71 72 72 156...

Page 43: ...5 g 1 8 lb ï ï Transmitter Output power 25 W High and 1 W Low Modulation system Variable reactance frequency modu lation Max frequency deviation 5 0 kHz Spurious emissions Less than 70 dBc High Less than 56 dBc Low Adjacent channel power More than 70 dB ï ï Receiver Receive system Double conversion superheterodyne Sensitivity 12 dB SINAD 0 22 µV typical Squelch sensitivity Less than 0 22µV Intermo...

Page 44: ... MOUNT KIT For mounting the transceiver to a panel MB 92 DUST COVER For attaching to the front panel of the transceiver to protect it when not in use Unit mm inch 153 0 6 1 32 67 0 2 5 8 143 5 5 21 32 51 0 2 42 2 1 21 32 86 3 3 13 32 137 0 5 13 32 133 5 1 4 ...

Page 45: ...2 5 8 53 0 2 3 32 Cut here NOTE The solid line is the line to use when cutting into the dash helm The dotted line shows the outline of the IC M304 s front panel once the radio is fitted into the hole Do not follow the dotted line when making the hole in your dash helm ...

Page 46: ......

Page 47: ...MEMO ...

Page 48: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan A 6542D 1US Printed in Japan 2006 Icom Inc ...

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