INSTRUCTION MANUAL
VHF MARINE TRANSCEIVER
iM304
IN CASE OF EMERGENCY
NOTE
If your vessel requires assistance, contact other vessels and
the Coast Guard by sending a distress call on Channel 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 con-
trols of the radio as in the diagram below. Make sure the cho-
sen location is clean and dry before applying the sticker.
(p. 32)
USING CHANNEL 16
DISTRESS CALL PROCEDURE
1. “MAYDAY MAYDAY MAYDAY.”
2. “THIS IS ...............” (name of vessel)
3. Your call sign or other indication of the vessel (AND 9-
digit DSC ID if you have one).
EXAMPLE
4. “LOCATED AT ...............” (your position)
5. The nature of the distress and assistance required.
6. Any other information which might facilitate the rescue.
WARNING
STICKER
Or, transmit your distress call using digital selective calling on
Channel 70.
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.
ii
RADIO OPERATOR WARNING
Icom requires the radio operator to meet the
FCC Requirements for Radio Frequency Expo-
sure. An omnidirectional antenna with gain not
greater than 9 dBi must be mounted a minimum
FAILURE TO OBSERVE THESE LIMITS MAY ALLOW
THOSE WITHIN THE MPE RADIUS TO EXPERIENCE RF
RADIATION ABSORPTION WHICH EXCEEDS THE FCC
MAXIMUM PERMISSIBLE EXPOSURE (MPE) LIMIT.
IT IS THE RESPONSIBILITY OF THE RADIO OPERATOR
TO ENSURE THAT THE MAXIMUM PERMISSIBLE EXPO-
SURE LIMITS ARE OBSERVED AT ALL TIMES DURING
RADIO TRANSMISSION. THE RADIO OPERATOR IS TO
ENSURE THAT NO BYSTANDERS COME WITHIN THE
RADIUS OF THE MAXIMUM PERMISSIBLE EXPOSURE
LIMITS.
WARNING
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 re-
quirements. This 5 meter distance is based on the FCC Safe
Maximum Permissible Exposure (MPE) distance of 3 meters
added to the height of an adult (2 meters) and is appropriate
for all vessels.
Determining MPE Radius
THE MAXIMUM PERMISSIBLE EXPOSURE (MPE) RA-
DIUS HAS BEEN ESTIMATED TO BE A RADIUS OF
ABOUT 3M PER OET BULLETIN 65 OF THE FCC.
THIS ESTIMATE IS MADE ASSUMING THE MAXIMUM
POWER OF THE RADIO AND ANTENNAS WITH A MAXI-
MUM GAIN OF 9dBi ARE USED FOR A SHIP MOUNTED
SYSTEM.
For watercraft without suitable structures, the antenna must
be mounted so as to maintain a minimum of 1 meter vertically
between the antenna, (measured from the lowest point of the
antenna), to the heads of all persons AND all persons must
stay outside of the 3 meter MPE radius.
Do not transmit 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.
iii
TABLE OF CONTENTS
FOREWORD …………………………………………………………… i
IMPORTANT …………………………………………………………… i
EXPLICIT DEFINITIONS ……………………………………………… i
IN CASE OF EMERGENCY…………………………………………… ii
NOTE …………………………………………………………………… ii
RADIO OPERATOR WARNING……………………………………… iii
TABLE OF CONTENTS ……………………………………………… iv
PRECAUTIONS………………………………………………………… v
6
DSC OPERATION …………………………………………… 13–27
I MMSI code programming……………………………………… 13
I MMSI code check ……………………………………………… 13
I DSC address ID………………………………………………… 14
I Position indication ……………………………………………… 15
I Distress call …………………………………………………… 16
I Transmitting DSC calls ………………………………………… 17
I Receiving DSC calls …………………………………………… 24
7
8
SET MODE …………………………………………………… 28–30
I Set mode programming ……………………………………… 28
I Set mode items ………………………………………………… 29
1
2
OPERATING RULES ……………………………………………… 1
PANEL DESCRIPTION ………………………………………… 2–4
I Front panel ……………………………………………………… 2
I Microphone ……………………………………………………… 3
I Function display ………………………………………………… 4
CONNECTIONS AND MAINTENANCE …………………… 31–34
I Connections …………………………………………………… 31
I Supplied accessories ………………………………………… 32
I Antenna ………………………………………………………… 32
I Fuse replacement ……………………………………………… 32
I Cleaning ………………………………………………………… 32
I Mounting the transceiver ……………………………………… 33
I Optional MB-92 attachment…………………………………… 33
I Optional MB-69 installation …………………………………… 34
3
BASIC OPERATION …………………………………………… 5–9
I Channel selection ……………………………………………… 5
I Receiving and transmitting……………………………………… 7
I Call channel programming ……………………………………… 8
I Channel comments ……………………………………………… 8
I Microphone lock function ……………………………………… 9
I Display backlighting……………………………………………… 9
I AquaQuake water draining function …………………………… 9
9
TROUBLESHOOTING …………………………………………… 35
10 CHANNEL LIST…………………………………………………… 36
4
5
SCAN OPERATION ………………………………………… 10–11
I Scan types ……………………………………………………… 10
I Setting TAG channels ………………………………………… 11
I Starting a scan ………………………………………………… 11
11 SPECIFICATIONS AND OPTIONS ……………………… 37–38
I Specifications…………………………………………………… 37
I Options ………………………………………………………… 38
DUALWATCH/TRI-WATCH ……………………………………… 12
I Description ……………………………………………………… 12
I Operation ……………………………………………………… 12
12 TEMPLATE ……………………………………………………… 39
iv
PRECAUTIONS
BE CAREFUL! The transceiver rear panel will become
hot when operating continuously for long periods.
Place the transceiver in a secure place to avoid inadvertent
use by children.
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 ex-
pressly approved by Icom Inc., could void your authority to
operate this device under FCC regulations.
BE CAREFUL! The transceiver (except cables) and hand
microphone employ waterproof construction, which corre-
sponds to IPX7 of the international standard IEC 60529
(2001). However, once the transceiver has been dropped,
waterproofing cannot be guaranteed due to the fact that the
case may be cracked, or the waterproof seal damaged, etc.
NEVER connect the transceiver to a power source of more
than 16 V DC or use reverse polarity. This will ruin the trans-
ceiver.
NEVER cut the DC power cable between the DC plug and
fuse holder. If an incorrect connection is made after cutting,
the transceiver may be damaged.
NEVER place the transceiver where normal operation of the
vessel may be hindered or where it could cause bodily 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.
v
OPERATING RULES
1
(2) OPERATOR’S LICENSE
D
PRIORITIES
1
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.
• 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.
The Restricted Radiotelephone Operator Permit must be
posted or kept with the operator. Only a licensed radio opera-
tor may operate a transceiver.
• You must monitor Channel 16 when you are not operating
on another channel.
• False or fraudulent distress signals are prohibited and pun-
ishable by law.
However, non-licensed individuals may talk over a transceiver
if a licensed operator starts, supervises, ends the call and
makes the necessary log entries.
D
PRIVACY
• Information overheard but not intended for you cannot law-
fully be used in any way.
Keep a copy of the current government rules and regulations
handy.
• Indecent or profane language is prohibited.
Radio license for boaters (U.S.A. only)
The Telecommunications Act of 1996 permits recreational
boaters to have and use a VHF marine radio, EPIRB, and
marine radar without having an FCC ship station license.
Boaters traveling on international voyages, having an HF
single sideband radiotelephone or marine satellite termi-
nal, or required to carry a marine radio under any other
regulation must still carry an FCC ship station license. For
further information, see the FCC Ship Radio Stations Fact
Sheet.
D
RADIO LICENSES
(1) SHIP STATION LICENSE
You must have a current radio station license before using the
transceiver. It is unlawful to operate a ship station which is not
licensed.
Inquire through your dealer or the appropriate government
agency for a Ship-Radiotelephone license application. This
government-issued license states the call sign which is your
craft’s identification for radio purposes.
1
PANEL DESCRIPTION
2
I Front panel
w POWER/VOLUME CONTROL [VOL] (p. 7)
Rotate to turn the transceiver power ON and OFF and ad-
justs the audio level.
Speaker
Function display (p. 4)
q
w
e SQUELCH CONTROL [SQL] (p. 7)
Rotate to set the squelch threshold level.
r CHANNEL 16/CALL CHANNEL KEY [!•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 cursor forward. (p. 8)
i
u
y
t
r
e
q CHANNEL UP/DOWN KEYS [Y]/[Z]•[U/I/C]
➥Selects the operating channels, Set mode settings, etc.
(pgs. 5, 6, 28)
➥While turning power ON, push to enter Set mode. (p. 28)
t CHANNEL/WEATHER CHANNEL KEY [CH/WX•DUAL]
➥Selects and toggles the regular channel and weather
channel when pushed momentarily. (p. 6)
➥Push and hold for 1 sec. to start Dualwatch or Tri-watch.
(p. 12)
➥While pushing and holding [SCAN], push to adjust the
brightness of the LCD and key backlight. (p. 9)
➥Selects one of three channel groups in sequence when
both keys are pushed. (p. 6)
• U.S.A., International and Canadian channels are available.
➥While turning power ON, push and hold both keys to ac-
tivate the AquaQuake function. (p. 9)
➥Push to stop Dualwatch or Tri-watch when either is acti-
vated. (p. 12)
➥Push to move the cursor backward. (p. 8)
2
PANEL DESCRIPTION 2
I Microphone
2
y SCAN KEY [SCAN•TAG] (p. 11)
q
➥Push to start or stop the Normal or Priority scan.
➥Push and hold for 1 sec. to set or clear the displayed
channel as a TAG (scanned) channel.
Microphone
• The favorite channels are set by the TAG channel setting.
➥While pushing and holding [HI/LO] on the microphone,
push for 3 sec. to clear all TAG channels in the selected
channel group.
w
e
• Repeat above procedure to set all TAG channels.
u DISTRESS KEY [DISTRESS] (p. 16)
Push and hold for 5 sec. to transmit a Distress call.
i DSC/POSITION KEY [DSC•POS]
➥Push to enter DSC menu. (p. 13)
q PTT SWITCH [PTT]
➥Push and hold for 1 sec. to show the current position
from a GPS receiver. (p. 15)
Push and hold to transmit; release to receive. (p. 7)
w CHANNEL UP/DOWN KEYS [Y]/[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 favorite channels in the selected
channel group in sequence. (p. 30)
e TRANSMIT POWER KEY [HI/LO]
➥ Push to toggle the power high and low. (p. 7)
• Some channels are set to low power only.
➥ While pushing and holding [HI/LO], turn power ON to
toggle the Microphone Lock function ON and OFF.
(p. 9)
3
2
PANEL DESCRIPTION
t CALL CHANNEL INDICATOR (p. 5)
I Function display
Appears when the call channel is selected.
y LOW POWER INDICATOR (p. 7)
q
w
e
r
Appears when low power is selected.
u WEATHER CHANNEL INDICATOR (pgs. 6, 29)
➥“WX” appears when a weather channel is selected.
➥“WX ALT” appears when the Weather alert function is in
use; blinks when an alert tone is received.
!
t
y
!
!
u
i
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
o CHANNEL COMMENT INDICATOR
➥Channel comment appears if programmed. (p. 8)
q CHANNEL GROUP INDICATOR (p. 6)
➥“
” scrolls when the battery voltage drops to
Indicates whether a U.S.A. “U,” International “ ” or Cana-
dian “C” channel is in use.
approx. 10.8 V DC or below.
➥“ ” blinks during Priority scan; “
” blinks during
Normal scan. (p. 11)
➥“ ” blinks during Dualwatch; “ ” blinks during Tri-
watch. (p. 12)
w CHANNEL NUMBER READOUT
➥Indicates the selected operating channel number.
• Refer to CHANNEL LIST. (p. 36)
➥In Set mode, indicates the selected condition. (p. 28)
! TAG CHANNEL INDICATOR (p. 11)
Appears when a TAG channel is selected.
e TRANSMIT INDICATOR (p. 7)
Appears while transmitting.
! DUPLEX INDICATOR (p. 6)
Appears when a duplex channel is selected.
r BUSY INDICATOR (p. 7)
Appears when receiving a signal or when the squelch
opens.
! GPS INDICATOR
➥Appears while valid position data is received.
➥Blinks when invalid position data is received.
➥Disappears when no GPS receiver is connected.
4
BASIC OPERATION
3
I Channel selection
2
3
ï
ï
Channel 16
Channel 9 (Call channel)
Channel 16 is the distress and safety channel. It is used for
establishing initial contact with a station and for emergency
communications. Channel 16 is monitored during both Dual-
watch and Tri-watch. While standing by, you must monitor
Channel 16.
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 recall.
➥ Push [!] momentarily to select Channel 16.
➥ Push [CH/WX] to return to the condition before selecting
Channel 16, or push [Y] or [Z] to select operating chan-
nel.
➥ Push and hold [9] (!) for 1 sec. to select the call channel
of the selected channel group.
• “CALL” and call channel number appear.
• Each channel group may have an independent call channel after
programming a call channel. (p. 8)
➥ Push [CH/WX] to return to the condition before selecting
call channel, or push [Y] or [Z] to select a channel.
Push
Push
for 1 sec.
Scrolls
Convenient!
Scrolls
When the Favorite channel function is turned ON (p. 30),
[Y]/[Z] keys on the microphone select the favorite channels
in the selected channel group in sequence when pushed.
• The favorite channels are set by the TAG channel setting. (p. 11)
5
3
BASIC OPERATION
ï
ï
U.S.A.,Canadian and international channels
Weather channels
The IC-M304 is pre-programmed with 59 U.S.A., 59 interna-
tional and 63 Canadian channels. These channel groups may
be specified for the operating area.
The IC-M304 has 10 pre-programmed weather channels.
These are used for monitoring broadcasts from NOAA (Na-
tional Oceanic and Atmospheric Administration.)
q Push [CH/WX] to select a regular channel.
• If a weather channel appears, push [CH/WX] again.
w Push [U/I/C] (both [Y] and [Z]) on the transceiver to
change the channel group, if necessary.
• U.S.A., International and Canadian channel groups can be se-
lected in sequence.
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 twice to select a weather channel.
• “WX” appears when a weather channel is selected.
• “WX ALT” appears when the Weather alert function is in use.
(p. 29)
e Push [Y] or [Z] to select a channel.
• “ ” appears for duplex channels.
w Push [Y] or [Z] to select a channel.
Push
once or twice
Push [U/I/C] (both
and
)
When Weather alert is OFF.
When Weather alert is ON.
6
BASIC OPERATION 3
I Receiving and transmitting
CAUTION: Transmitting without an antenna will damage
the transceiver.
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-
NOT be lawfully used by the general public in U.S.A. wa-
ters.
3
q Rotate [VOL] to turn power ON.
w Set the audio and squelch levels.
IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone 2 to 4 inches (5 to 10 cm) from your mouth
and speak into the microphone at a normal voice level.
➥ Rotate [SQL] fully counterclockwise in advance.
➥ Rotate [VOL] to adjust the audio output level.
➥ Rotate [SQL] clockwise until the noise disappears.
e Push [U/I/C] (both [Y] and [Z]) on the transceiver several
times to select the desired channel group. (p. 6)
r Push [Y] or [Z] to select a channel. (p. 5)
Microphone
y u
e r
q
• When receiving a signal, “
from the speaker.
” appears and audio is emitted
• Further adjustment of [VOL] may be necessary.
t Push [HI/LO] on the microphone to select the output
power if necessary.
• “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.
w
r
t
y Push and hold [PTT] to transmit, then speak into the mi-
crophone.
✔ NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a pre-
set time period after the transmission starts.
• “
” appears.
• Channel 70 cannot be used for transmission other than DSC.
u Release [PTT] to receive.
7
3
BASIC OPERATION
I Call channel programming
I Channel comments
Call channel is used to select Channel 9 (default), however,
you can program the call channel with your most often-used
channel in each channel group for quick recall.
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.
q Push [U/I/C] (both [Y] and [Z]) on the transceiver several
times to select the desired channel group (U.S.A., Interna-
tional or Canada) to be programmed.
w Push and hold [9] (!) for 1 sec. to select the call channel
of the selected channel group.
• “CALL” and call channel number appear.
e Push and hold [9] (!)
again for 3 sec. (until a long
beep changes to 2 short
beeps) to enter call channel
programming condition.
Capital letters, small letters (except f, j, k, p, s, v, x, z), 0 to 9,
some symbols (= ✱ + – . /) and space can be used.
q Select the desired channel.
• Cancel Dualwatch, Tri-watch or Scan in advance.
w While pushing [CH/WX], push [!] to edit the channel
comment.
• A cursor and the first char-
acter start blinking alter-
nately.
• Channel number starts blink-
ing.
r Push [Y] or [Z] to select
the desired channel.
t Push [!] to program the
displayed channel as the
call channel.
e Pushing [Y] or [Z] to select the desired character.
• Push [!] or [CH/WX] to move the cursor forward or backward,
respectively.
r Repeat step e to input all characters.
t Push [DSC] to input and set the comment.
• Push [SCAN] to cancel.
• The cursor and the character stop blinking.
y Repeat steps q to t to program other channel com-
ments, if desired.
• Push [CH/WX] to cancel.
• The channel number stops
blinking.
8
BASIC OPERATION 3
I Microphone lock function
The microphone lock function electrically locks [Y] and [Z]
keys on the supplied microphone. This prevents accidental
channel changes and function access.
I AquaQuake water draining
function
3
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.
➥ While pushing and holding [HI/LO] on the microphone,
turn power ON to toggle the Microphone lock function ON
and OFF.
➥ While pushing and holding [Y] and [Z], turn power ON.
• A low beep tone sounds while [Y] or [Z] keys are held to drain
water, regardless of [VOL] control setting.
• The transceiver never accepts a key operation while the
AquaQuake function is activated.
[Y]/[Z]
[HI/LO]
• “
” scrolls at the channel comment indicator.
I Display backlighting
Scrolls
The function display and keys can be backlit for better visibil-
ity under low light conditions.
➥ While pushing and holding [SCAN], push [Y] or [Z] to ad-
just the brightness of the LCD and key backlight.
• The backlight is selectable in 3 levels and OFF.
9
SCAN OPERATION
4
I Scan types
Scanning is an efficient way to locate signals quickly over a
wide frequency range. The transceiver has Priority scan and
Normal scan.
Set the TAG channels (scanned channels) before scanning.
Clear the TAG channels which inconveniently stop scanning,
such as those for digital communication use. (Refer to the
right page for details.)
When the Weather alert function is turned ON, the previously
selected (last used) weather channel is also checked while
scanning. (p. 29)
Choose Priority or Normal scan in Set mode. (p. 29)
PRIORITY SCAN
NORMAL SCAN
CH 01
CH 02
CH 01
CH 02
CH 06
CH 03
CH 06
CH 16
CH 03
CH 05
CH 04
CH 05
CH 04
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.
Normal scan, like priority scan, searches through all TAG
channels in sequence. However, unlike priority scan, Chan-
nel 16 is not checked unless Channel 16 is set as a TAG
channel.
10
SCAN OPERATION 4
I Setting TAG channels
I Starting a scan
For more efficient scanning, add desired channels as TAG
channels or clear the TAG for unwanted channels.
Set scan type (Priority or Normal scan) and scan resume
timer in advance using Set mode. (p. 29)
Channels that are not tagged will be skipped during scanning.
TAG channels can be assigned to each channel group
(U.S.A., International and Canada) independently.
4
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.
q Push [U/I/C] (both [Y] and [Z]) several times to select the
desired channel group.
w Select the desired channel to be set as a TAG channel.
e Push and hold [TAG] (SCAN) for 1 sec. to set the dis-
played channel as a TAG channel.
e Make sure the squelch is closed to start a scan.
r Push [SCAN] to start Priority or Normal scan.
• “
” blinks during Priority scan; “
” blinks during Normal
scan.
• When a signal is detected, scan pauses until the signal disap-
pears or resumes after pausing 5 sec. according to Set mode
setting. (Channel 16 is still monitored during Priority scan.)
• Push [Y] or [Z] to check the scanning TAG channels, to change
the scanning direction or resume the scan manually.
• “
” appears in the display.
r To cancel the TAG channel setting, repeat step e.
• “
” disappears.
• A beep tone sounds and “
indicator when a signal is received on Channel 16 during Priority
scan.
” blinks at the channel comment
✔ Clearing (or setting) all tagged channels
While pushing and holding [HI/LO] on the microphone, push
[TAG] (SCAN) for 3 sec. (until a long beep changes to 2 short
beeps) to clear all TAG channels in the selected channel group.
• Repeat above procedure to set all TAG channels.
t To stop the scan, push [SCAN].
[Example]: Starting a normal scan.
Scan starts.
When a signal is received.
Push
Push
to stop the scan
11
DUALWATCH/TRI-WATCH
5
I Description
I Operation
Dualwatch monitors Channel 16 while you are receiving
on another channel; Tri-watch monitors Channel 16 and the
call channel while receiving another channel. Dualwatch/Tri-
watch are convenient for monitor Channel 16 when you are
operating on another channel.
q Select Dualwatch or Tri-watch in Set mode. (p. 29)
w Select the desired channel.
e Push and hold [DUAL] (CH/WX) for 1 sec. to start Dual-
watch or Tri-watch.
• “ ” blinks during Dualwatch; “ ” blinks during Tri-watch.
• 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
Call channel
[Example]: Operating Tri-watch on INT Channel 25
Tri-watch starts.
Push and hold
for 1 sec.
Signal is received on call
channel.
Dualwatch
Tri-watch
• 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 channel during Dualwatch/Tri-
watch, push and hold [PTT].
Signal is received on
Channel 16 takes priority.
Tri-watch resumes after
the signal disappears.
12
DSC OPERATION
6
I MMSI code programming
I MMSI code check
The 9-digit MMSI (Maritime Mobile Service Identity: DSC self
ID) code can be programmed at power ON.
The 9-digit MMSI (DSC self ID) code can be checked.
q Push [DSC] to enter the DSC menu.
This code programming can be performed only twice.
w Push [Y] or [Z] to select “
” and push [DSC].
5
6
q Turn power OFF.
w While pushing and holding [DSC], turn power ON to enter
MMSI code programming condition.
e After the display appears, release [DSC].
• A cursor starts blinking.
e Check the 9-digit MMSI (DSC self ID) code.
• The MMSI code is displayed and scrolls at the channel comment
indicator.
r Edit the specified MMSI code by pushing [Y] or [Z].
• Push [!] 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 (DSC self ID) code scrolls
r Push [DSC] to return to the normal operation.
13
6
DSC OPERATION
I DSC address ID
A total of 30 DSC address IDs (9-digit) can be programmed
and named with up to 5 characters.
r Push [Y] or [Z] to input 9-digit of the appropriate address
ID.
• Push [!] or [CH/WX] to move the cursor forward or backward,
respectively.
D Programming address ID
q Push [DSC] to enter the DSC menu.
• 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.
w Push [Y] or [Z] to select “
,” and push [DSC].
Scrolls
,” and push [DSC].
e Push [Y] or [Z] to select “
t After inputting 9-digit ID, push [DSC] to input 5 characters
ID name using [Y] or [Z].
• Push [!] or [CH/WX] to move the cursor forward or backward,
respectively.
• Push [SCAN] to cancel and exit the condition.
y Push [DSC] to program and exit the DSC menu.
14
DSC OPERATION 6
D Deleting address ID
q Push [DSC] to enter the DSC menu.
I Position indication
w Push [Y] or [Z] to select “
” and push [DSC].
When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) 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.
6
Scrolls
e Push [Y] or [Z] to select “ ”, then push [DSC].
➥ Push and hold [POS] (DSC) for 1 sec. to display the cur-
rent position.
• When no address ID is programmed, “
” is displayed.
• ‘Latitude’ and ‘Longitude’ scroll in sequence at the channel com-
ment indicator.
• “
” scrolls when no GPS is connected.
r Push [Y] or [Z] to select the desired ID name for deleting
and push [DSC].
Scrolls
• “
” appears.
• When the connecting GPS receiver is compatible with
several sentence formatters, the order of input prece-
dence is ‘RMC,’ ‘GGA,’ ‘GNS’ and ‘GLL.’
• “GPS” blinks when the GPS data is invalid.
t Push [DSC] to delete the address ID and exit the DSC
menu.
15
6
DSC OPERATION
I 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 imme-
diate assistance.
NEVER USE THE DISTRESS CALL WHEN YOUR
SHIP OR A PERSON IS NOT IN AN EMERGENCY.
A DISTRESS CALL CAN BE USED ONLY WHEN
IMMEDIATE HELP IS NEEDED.
Scrolls
r After receiving the acknowledgment, reply using the mi-
crophone.
• “
” scrolls at the channel comment indicator.
q Confirm no Distress call is being received.
w While opening the key cover, push [DISTRESS] for 5 sec.
to transmit the Distress call.
• Emergency channel (Channel 70) is automatically selected and
the Distress call is transmitted.
Scrolls
➥ A distress alert contains;
• Kinds of distress : Undesignated distress
• Position data
: GPS position data held for 23.5 hrs. or until
the power is turned OFF.
e After transmitting the call, the transceiver waits for an ac-
knowledgment call on Channel 70.
➥ The Distress call is repeated every 3.5–4.5 min., until
receiving an ‘acknowledgement.’
➥ Push and hold [DISTRESS] for 5 sec. to transmit a re-
newed Distress call, if desired.
• The Distress call is automatically transmitted every 3.5 to 4.5
minutes.
• “
” scrolls at the channel comment indicator.
➥ Push any key except [DISTRESS] to cancel the ‘Call
repeat’ mode.
16
DSC OPERATION 6
I Transmitting DSC calls
To ensure correct operation of the DSC function, please
make sure you set the squelch correctly. (p. 7)
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.
D Transmitting Individual call
The Individual call function allows you to transmit a DSC sig-
nal to a specific ship only.
• Channel 70 is selected and “
” appears after pushing
[DSC].
6
q Push [DSC] to enter the DSC menu.
• “
” scrolls at the channel comment indicator.
r Push [DSC] to transmit the Individual call.
• If Channel 70 is busy, the transceiver stands by until the channel
becomes clear.
Scrolls
w Push [DSC] 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)
• Routine category only is available.
While transmitting
When Ch 70 is busy.
17
6
DSC OPERATION
t After transmitting the Individual call, standby on Channel
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.
70 until an acknowledgement is received.
• “
” scrolls at the channel comment indicator.
q Push [DSC] to enter the DSC menu.
w Push [Y] or [Z] to select “
” and push [DSC].
Scrolls
• “
” item appears after an Individual call is received.
y When the acknowledgement ‘Able to comply’ is received,
the specified channel (in step e) is selected with beeps
automatically. Or, when the acknowledgement ‘Unable to
comply’ is received, the display returns to the operated
channel (before entering the DSC menu) with beeps.
• “
” item disappears if another call is received after the
Individual call.
• The Individual acknowledgement can be transmitted to the last
received individual call only.
• “
” or “
” scrolls at the channel
comment indicator.
‘Able to comply’
is received
Scrolls
e Push [Y] or [Z] to select the acknowledgement “
.”
” or
“
Scrolls
u Push and hold [PTT] to communicate your message to the
responding ship when ‘Able to comply’ is received.
18
DSC OPERATION 6
D Transmitting Group call
The Group call function allows you to transmit a DSC signal
to a specific group only.
r Push [DSC] to enter the standby condition for Individual
acknowledgement call.
• “
” appears at the channel comment indicator.
q Push [DSC] to enter the DSC menu.
w Push [Y] or [Z] to select “
,” and push [DSC].
6
t Push [DSC] to transmit the acknowledgement to the se-
lected station.
e Push [Y] or [Z] to select the desired pre-programmed
group address, and push [DSC].
• The ID code for the group call must be set in advance. (p. 14)
y After the Individual acknowledgement has been transmit-
ted, the display changes to the channel specified by the
calling station automatically when “
” is selected.
Scrolls
19
6
DSC OPERATION
r Push [Y] or [Z] to select the desired intership channel,
and push [DSC].
y After the Group call has been transmitted, the display
changes to the previously specified channel.
• Channel 70 is selected and “
” appears.
Scrolls
u Push and hold [PTT] to communicate your message to the
responding ship.
t Push [DSC] to transmit the Group call.
• If Channel 70 is busy, the transceiver stands by until the channel
becomes clear.
• Routine category only is available.
While transmitting
20
DSC OPERATION 6
D Transmitting All Ships call
r Push [DSC] to transmit the All Ships call.
Large ships use Channel 70 as their ‘listening channel.’
When you want to announce a message to these ships, use
• Routine category only is available.
• Low power is selected.
the ‘All Ships call’ function.
q Push [DSC] to enter the DSC menu.
w Push [Y] or [Z] to select “
.”
6
While transmitting
t After the All Ships call has been transmitted, the display
changes to Channel 16 automatically.
Scrolls
e Push [DSC] to enter the standby condition for All Ships
call.
• Channel 70 is selected and “
” appears.
Scrolls
21
6
DSC OPERATION
D Transmitting Position Request call
Transmit a Position Request call when you want to know a
specified ship’s current position, etc.
r Push [DSC] to enter the standby condition for Position Re-
quest call.
• Channel 70 is selected and “
” appears.
q Push [DSC] to enter the DSC menu.
w Push [Y] or [Z] to select “
,” then push [DSC].
t Push [DSC] to transmit the Position Request call.
Scrolls
e Push [Y] or [Z] to select the desired pre-programmed in-
dividual address.
• The ID code for position request must be set in advance. (p. 14)
While transmitting
y After the Position Request call has been transmitted, the
following indication is displayed.
• “
” scrolls at the channel comment indicator.
Scrolls
u Push any key to exit the condition and return to the normal
operation.
22
DSC OPERATION 6
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 an answer, etc.
r Push [DSC] to enter the standby condition for Position Re-
port call.
• Channel 70 is selected and “
” appears.
q Push [DSC] to enter the DSC menu.
w Push [Y] or [Z] to select “
,” and push [DSC].
6
t Push [DSC] to transmit the Position Report call.
Scrolls
e Push [Y] or [Z] to select the desired pre-programmed in-
dividual address.
• The ID code for the position report call can be set in advance.
(p. 14)
While transmitting
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.
Scrolls
u Push any key to exit the condition and return to the normal
operation.
23
6
DSC OPERATION
I Receiving DSC calls
D Receiving a Distress call
While monitoring Channel 70 and a Distress call is received:
➥ The emergency alarm sounds.
D Receiving a Distress acknowledgement
While monitoring Channel 70 and a Distress acknowledge-
ment to other ship is received:
• Push any key to stop the alarm.
➥ The emergency alarm sounds.
➥ “DSC” appears and “
” scrolls at the channel
• Push any key to stop the alarm.
comment indicator, then Channel 16 is automatically se-
➥ “DSC” appears and “
” scrolls at the chan-
lected.
nel comment indicator, then Channel 16 is automatically
selected.
➥ Continue monitoring Channel 16 as a coast station may re-
quire assistance.
Scrolls
Scrolls
D Receiving a Distress Relay call
While monitoring Channel 70 and a Distress Relay acknowl-
edgement is received:
➥ The emergency alarm sounds.
• Push any key to stop the alarm.
➥ “DSC” appears and “
” scrolls at the channel com-
ment indicator, then Channel 16 is automatically selected.
Scrolls
24
DSC OPERATION 6
D Receiving an Individual call
While monitoring Channel 70 and an Individual call is re-
ceived:
➥ The emergency alarm or beeps sound depending on the
received category.
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
➥ “DSC” appears and “
” scrolls at the channel
comment indicator.
6
comment indicator.
➥ Push any key to stop beep, then push [DSC] to select the
channel specified by the calling station for voice commu-
nication; push any other key to ignore the Group call.
➥ Push any key to stop beep, then push [DSC] to reply the
call and select the channel specified by the calling station
for voice 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.
Scrolls
Scrolls
25
6
DSC OPERATION
D Receiving an All Ships call
D Receiving a Geographical Area call
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.
While monitoring Channel 70 and an All Ships call is received:
➥ The emergency alarm sounds when the category is ‘Dis-
tress’ or ‘Urgency’; 2 beeps sound for other categories.
➥ “DSC” appears and “
” scrolls at the channel
comment indicator.
➥ “DSC” appears and “
” scrolls at the chan-
➥ Push any key to stop beep, then push [DSC] to monitor
channel 16 for an announcement from the calling vessel,
push any other key to ignore the call.
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 call.
➥ Monitor the selected channel for an announcement from
the calling station.
Scrolls
Scrolls
When no GPS receiver is connected or if there is a prob-
lem with the connected receiver, all Geographical Area
calls are received, regardless of your position.
26
DSC OPERATION 6
D Receiving a Position Request call
While monitoring Channel 70 and a Position Request call is
received:
D Receiving a Position Reply call
While monitoring Channel 70 and a Position Reply call is re-
ceived:
➥ “DSC” appears and “
nel comment indicator.
➥ Push any key to stop the beep, then push [DSC] to reply to
” scrolls at the chan-
➥ “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 Longitude co-ordinates.
the call; push any other key to ignore the call.
➥ Push any key to stop the beep.
6
Scrolls
Scrolls
D Receiving a Position Report call
While monitoring Channel 70 and a Position Report call is re-
ceived:
D Receiving a Position Report Reply call
While monitoring Channel 70 and a Position Report Reply call
is received:
➥ “DSC” and “POS REPLY” appear in the display.
• The ‘Latitude’ and ‘Longitude’ you have sent is displayed and
scrolled automatically in order of Latitude co-ordinates and then
Longitude co-ordinates.
➥ “DSC” appears and “
” scrolls at the chan-
nel comment indicator.
➥ Push any key to stop the beep, then push [DSC] to reply to
the call; push any other key to ignore the call.
• The ‘Latitude’ and ‘Longitude’ from the called station is displayed
and scrolled automatically in order of Latitude co-ordinates and
then Longitude co-ordinates after replying the call.
➥ Push any key to stop the beep.
Scrolls
Scrolls
27
SET MODE
7
I Set mode programming
Set mode is used to change the conditions of the trans-
ceiver’s functions: Scan type (Normal or Priority,) Scan re-
sume timer, Weather alert, Dual/Tri-watch, DSC watch, Beep
tone, Auto acknowledgement and Favorite channel function.
D Set mode operation
q Turn power OFF.
w While pushing [!], turn power ON to enter Set mode.
e After the display appears, release [!].
• “
” appears at the channel comment indicator.
Available functions may differ depending on dealer setting.
r Push [!] 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.
D Set mode construction
• Scan type
• Scan resume timer
• Weather alert
• Dual/Tri-watch
Starting item
Push
• Favorite channel function
• Auto acknowledgement
• Beep tone
• DSC watch
Scrolls
Scrolls
Scrolls
28
SET MODE 7
I Set mode items
D
D Scan type
Weather alert
The transceiver has 2 scan types: Normal scan and Priority
scan. Normal scan searches all TAG channels in the selected
channel group. Priority scan searches all TAG channels in se-
quence while monitoring Channel 16.
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 ALT” appears instead of “WX” indication when the function is
set ON.
7
Normal scan (default)
Priority scan
D
Scan resume timer
The scan resume timer can be selected as a pause (OFF) or
timer scan (ON). When OFF is selected, the scan pauses
until the signal disappears. When ON is selected, the scan
pauses 5 sec. and resumes even if a signal has been re-
ceived on any other channel than Channel 16.
Weather alert OFF (default)
Weather alert ON
D
Dual/Tri-watch
This item can be selected as Dualwatch or Tri-watch. (p. 12)
Dualwatch (default)
Tri-watch
Scan timer OFF (default)
Scan timer ON
29
7
SET MODE
D
D
DSC watch
Automatic acknowledgement
DSC watch monitors Channel 70 while you are receiving an-
other channel.
This item sets the Automatic acknowledgement function ON
or OFF.
If a distress signal is received on Channel 70, the transceiver
monitors Channel 16 and 70 alternately until the distress sig-
nal disappears. If a signal is received on another channel,
DSC watch pauses until the signal disappears.
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.
This function may not be available for some channel
groups depending on dealer setting.
• “
” scrolls at the channel comment indicator.
Auto acknowledgement
Auto acknowledgement
ON
OFF (default)
D
Favorite channel
DSC watch OFF (default)
DSC watch ON
This item sets the Favorite channel function ON or OFF.
The favorite channel is programmed by the TAG channel set-
ting (p. 11).
When the Favorite channel function is turned ON, [Y]/[Z]
keys on the microphone select the favorite channels in the
selected channel group in sequence when pushed.
D
Beep tone
You can select silent operation by turning beep tones OFF or
you can have confirmation beeps sound at the push of a key
by turning beep tones ON.
• “
” scrolls at the channel comment indicator.
Beep tone ON (default)
Beep tone OFF
Favorite CH ON (default)
Favorite CH OFF
30
CONNECTIONS AND MAINTENANCE
8
I Connections
e DC POWER CONNECTOR
q
w
Connects the supplied DC power cable from this connector
to an external 13.8 V DC power source.
e
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
7
8
Rubber vulcanizing
tape
q EXTERNAL SPEAKER LEAD
Connects to an external speaker.
Blue: Speaker (+)
r ANTENNA CONNECTOR
Gray: Speaker ( )
Connects a marine VHF antenna with a PL-259 connector
to the transceiver.
CAUTION: Transmitting without an antenna may dam-
age the transceiver.
w GPS RECEIVER LEAD
Connects to a GPS receiver for position indication.
• An 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.
Yellow: NMEA IN (+)
Green: NMEA IN ( )
31
8
CONNECTIONS AND MAINTENANCE
I Supplied accessories
I Antenna
The following accessories are supplied:
A key element in the performance of any communication sys-
tem is the antenna. Ask your dealer about antennas and the
best place to mount them.
Mounting bracket
For mounting bracket
Knob bolts
Screws (5×20)
I Fuse replacement
Flat washers Spring washers
One fuse is installed in the supplied DC power 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.
(M5)
(M5)
Microphone hanger
DC power cable
and screws (3×16)
I Cleaning
If the transceiver becomes dusty or dirty, wipe it clean with a
soft, dry cloth.
Warning sticker
AVOID the use of solvents such as benzene or al-
cohol, as they may damage transceiver surfaces.
32
CONNECTIONS AND MAINTENANCE 8
I Mounting the transceiver
I Optional MB-92 attachment
An optional MB-92 DUST COVER is available for attaching the
transceiver’s front panel to prevent the keys and knobs get-
ting wet when the transceiver is not used.
D
Using the supplied mounting bracket
The universal mounting bracket supplied with your transceiver
allows overhead or dashboard mounting.
➥ Attach the optional MB-92 DUST COVER to the transceiver
• Mount the transceiver securely with the 2 supplied screws
(5 × 20) to a surface which is more than 10 mm thick and
can support more than 5 kg.
as shown below.
• Mount the transceiver so 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.
8
NOTE: Check the installation angle; the function display
may not be easy-to-read at some angles.
EXAMPLE
33
8
CONNECTIONS AND MAINTENANCE
I Optional MB-69 installation
An optional MB-69 FLUSH MOUNT is available for mounting the
transceiver to a flat surface such as an instrument panel.
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.
CAUTION: KEEP the transceiver and microphone at least
1 meter away from your vessel’s magnetic navigation com-
pass.
q Using the template on p. 39, carefully cut a hole into the
instrument panel (or wherever you plan to mount the trans-
ceiver.)
w Slide the transceiver through the hole as shown below.
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 (rotate counterclockwise) so that
the transceiver is securely mounted in position as below.
y Connect the antenna and power cable, then return the in-
strument control panel to its original place.
34
TROUBLESHOOTING
9
PROBLEM
POSSIBLE CAUSE
SOLUTION
REF.
The transceiver does • Bad connection to the power supply.
not turn ON.
• Check the connection to the transceiver.
p. 31
No sound from speaker. • Squelch level is too high.
• Volume level is too low.
• Set squelch to the threshold point.
• Set [VOL] to a suitable level.
• Drain water from the speaker.
p. 7
p. 7
p. 9
• Speaker has been exposed to water.
Transmitting is impossi- • Some channels are for low power or re- • Change channels.
ble, or high power can ceive only.
pgs. 5,
6, 36
not be selected.
• The output power is set to low.
• Push [HI/LO] on the microphone to select p. 7
high power.
8
9
Scan does not start.
No beeps.
• “TAG” channel is not programmed.
• Beep tones are turned OFF.
• Set the desired channels as “TAG” channels. p. 11
• Turn the beep tone ON in Set mode.
p. 30
p. 13
Distress call cannot be • MMSI (DSC self ID) code is not pro- • Program the MMSI (DSC self ID) code.
transmitted. grammed.
35
CHANNEL LIST
10
Channel number Frequency (MHz)
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
USA INT CAN Transmit Receive
01
01 156.050 160.650
156.050 156.050
21
21 157.050 161.650
21A 157.050 157.050
21b Rx only 161.650
157.100 161.700
68
68
68 156.425 156.425
86A
87
157.325 157.325
87 157.375 161.975
157.375 157.375
01A
21A
22A
69
69
69 156.475 156.475
87
88
02
03
02 156.100 160.700
03 156.150 160.750
156.150 156.150
70*3 70*3 70*3 156.525 156.525
87A
88
22
23
71
72
73
74
71
72
73
74
71 156.575 156.575
72 156.625 156.625
73 156.675 156.675
74 156.725 156.725
88 157.425 162.025
157.425 157.425
03A
22A 157.100 157.100
23 157.150 161.750
157.150 157.150
88A
04
05
156.200 160.800
04A 156.200 156.200
156.250 160.850
23A
24
24
25
24 157.200 161.800
25 157.250 161.850
25b Rx only 161.850
26 157.300 161.900
27 157.350 161.950
28 157.400 162.000
28b Rx only 162.000
60 156.025 160.625
156.075 160.675
75*1 75*1 75*1 156.775 156.775
76*1 76*1 76*1 156.825 156.825
77*1 77 77*1 156.875 156.875
05A
06
05A 156.250 156.250
06 156.300 156.300
156.350 160.950
25
06
07
26
27
28
26
27
28
78
79
80
81
82
83
156.925 161.525
78A 156.925 156.925
156.975 161.575
07A
08
09
10
11
12
07A 156.350 156.350
08 156.400 156.400
09 156.450 156.450
10 156.500 156.500
11 156.550 156.550
12 156.600 156.600
78A
79A
80A
81A
82A
83A
08
09
10
11
12
79A 156.975 156.975
157.025 161.625
60
61
80A 157.025 157.025
157.075 161.675
Frequency (MHz)
61A
61A 156.075 156.075
156.125 160.725
WX channel
13*2 13 13*1 156.650 156.650
14 14 14 156.700 156.700
15*2 15*1 15*1 156.750 156.750
16 16 16 156.800 156.800
17*1 17 17*1 156.850 156.850
62
63
64
65
81A 157.075 157.075
157.125 161.725
Transmit
RX only
RX only
RX only
RX only
RX only
RX only
RX only
RX only
RX only
RX only
Receive
162.550
162.400
162.475
162.425
162.450
162.500
162.525
161.650
161.775
163.275
62A 156.125 156.125
156.175 160.775
1
2
82A 157.125 157.125
83 157.175 161.775
83A 157.175 157.175
83b Rx only 161.775
84 157.225 161.825
157.225 157.225
63A
64A
156.175 156.175
3
64 156.225 160.825
64A 156.225 156.225
156.275 160.875
4
18
156.900 161.500
18A 156.900 156.900
156.950 161.550
5
18A
84
84A
85
84
85
86
6
19
65A 65A 65A 156.275 156.275
66 156.325 160.925
66A 66A 66A*1 156.325 156.325
67*2 67
67 156.375 156.375
7
19A
20
19A 156.950 156.950
85 157.275 161.875
157.275 157.275
8
20 20*1 157.000 161.600
85A
86
9
20A
157.000 157.000
86 157.325 161.925
10
*1 Low power only. *2 Momentary high power. *3 DSC operation only.
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.
36
SPECIFICATIONS AND OPTIONS
11
I Specifications
ï
ï
General
Receiver
• Frequency coverage
: Transmit156.025–157.425 MHz
Receive 156.050–163.275 MHz
: FM (16K0G3E)
DSC (16K0G2B)
: 25 kHz
• Receive system
: Double conversion
superheterodyne
: 0.22 µV (typical)
: Less than 0.22µV
: More than 70 dB
• Mode
• Sensitivity (12 dB SINAD)
• Squelch sensitivity
• Intermodulation rejection ratio
• Channel spacing
• Current drain (at 13.8 V)
: TX (at 25 W) 5.5 A max.
• Spurious response rejection ratio : More than 70 dB
Max. audio
• 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
1.5 A max.
• Adjacent channel selectivity
• Audio output power
: More than 70 dB
: 4.5 W (typical) at 10%
distortion with a 4 Ω load
• Dimensions
(Projections not included)
• Weight
: 153(W) × 67(H) × 133(D) mm
6 1⁄32(W) × 2 5⁄8(H)× 5 1⁄4(D) in
: Approx. 825 g ; 1.8 lb
All stated specifications are subject to change without notice or
obligation.
10
11
ï
Transmitter
• Output power
: 25 W (High) and 1 W (Low)
: Variable reactance frequency modu-
lation
• Modulation system
• Max. frequency deviation
• Spurious emissions
:
5.0 kHz
: Less than –70 dBc (High)
Less than –56 dBc (Low)
: More than 70 dB
• Adjacent channel power
37
11 SPECIFICATIONS
D
Dimensions
I Options
137.0 (5 13⁄32)
• MB-69 FLUSH 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.
153.0 (6 1⁄32)
42.2
86.3 (3 13⁄32)
(1 21⁄32)
Unit: mm (inch)
38
TEMPLATE
12
153.0 (6 1⁄32)
139.0 (5 15⁄32)
11
12
Unit: mm (inch)
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.
39
MEMO
A-6542D-1US
Printed in Japan
© 2006 Icom Inc.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan
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