INSTRUCTION MANUAL
VHF MARINE TRANSCEIVER
iM31
IN CASE OF EMERGENCY
RECOMMENDATION
If your vessel requires assistance, contact other vessels and
the Coast Guard by sending a distress call on Channel 16.
❍ 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.
4. “LOCATED AT .....................” (your position)
5. The nature of the distress and assistance required.
6. Any other information which might facilitate
the rescue.
CLEAN THE TRANSCEIVER THOROUGHLY WITH FRESH
WATER after exposure to saltwater, and dry it before opera-
tion. Otherwise, the transceiver’s keys, switches and controllers may become inoperable due to salt crystallization.
i
FOREWORD
WORD
DEFINITION
RWARNING
CAUTION
NOTE
Personal injury, fire hazard or electric shock
may occur.
If disregarded, inconvenience only. No risk
of personal injury, fire or electric shock.
Equipment damage may occur.
FEATURES
Thank you for purchasing this Icom product. The IC-M31 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.
IMPORTANT
READ ALL INSTRUCTIONS carefully and com-
pletely before using the transceiver.
SAVE THIS INSTRUCTION MANUAL—This in-
struction manual contains important operating instructions for
the IC-M31.
EXPLICIT DEFINITIONS
☞ Waterproof construction
Built tough to withstand the punishing marine environment, the IC-M31 meets JIS waterproof specification
grade 7 while using BP-223 (option) or BP-224.
☞ Dualwatch and tri-watch functions
Convenient functions which allow you to monitor the distress channel (Ch 16) while receiving a channel of your
choice—dual watch; or monitor the distress channel and
another channel while receiving a channel of your
choice—tri-watch.
☞ Large, easy-to-read LCD
With dimensions of 16(H) × 32(W) mm, the IC-M31’s func-
tion display is easy to read and shows operating conditions
at a glance. Backlighting and contrast can be adjusted to
suit your preferences.
☞ Simple operation
9 large buttons on the front panel provide user-friendly operation. The independent volume and channel buttons are
located on the front panel for convenient one-hand operation.
ii
PRECAUTION
RWARNING! NEVER connect the transceiver to an
AC outlet. This may pose a fire hazard or result in an electric
shock.
RWARNING! NEVER hold the transceiver so that the
antenna is very close to, or touching exposed parts of the
body, especially the face or eyes, while transmitting. The
transceiver will perform best if the microphone is 5 to 10 cm
away from the lips and the transceiver is vertical.
NEVER connect the transceiver to a power source other
than the BP-223 or BP-224. Such a connection will ruin the
transceiver.
AVOID using or placing the transceiver in direct sunlight or
in areas with temperatures below –15°C or above +55°C.
KEEP the transceiver out of the reach of children.
KEEP the transceiver at least 0.9 meters away from your
vessel’s magnetic navigation compass.
iii
BE CAREFUL! The transceiver’s right-side panel will
become hot when operating continuously for long periods.
BE CAREFUL! The IC-M31 employs waterproof con-
struction, which corresponds to JIS waterproof specification,
Grade 7 (1 m depth for 30 min.). However, once the transceiver has been dropped, waterproofing cannot be guaranteed due to the fact that the transceiver may be cracked, or
the waterproof seal damaged, etc.
MAKE SURE the flexible antenna, top panel and battery
pack are securely attached to the transceiver, and that the antenna, top panel and battery pack are dry before attachment.
Exposing the inside of the transceiver to water will result in
serious damage to the transceiver.
Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France,
Spain, Russia and/or other countries.
TABLE OF CONTENTS
IN CASE OF EMERGENCY ................................................ i
RECOMMENDATION ........................................................... i
FOREWORD ....................................................................... ii
IMPORTANT ........................................................................ ii
EXPLICIT DEFINITIONS ..................................................... ii
FEATURES .......................................................................... ii
PRECAUTION .................................................................... iii
TABLE OF CONTENTS ...................................................... iv
1 OPERATING RULES ...................................................... 1
2 SUPPLIED ACCESSORIES AND ATTACHMENTS.... 2–3
■ Supplied accessories ................................................... 2
■ Attachments ................................................................. 2
3 PANEL DESCRIPTION ............................................... 4–6
■ Front, top and side panels ............................................ 4
■ Function display .......................................................... 5
4 BASIC OPERATION ................................................. 7–12
■ Channel selection ........................................................ 7
■ Adjusting the volume level ........................................... 9
■ Adjusting the squelch level .......................................... 9
■ Receiving and transmitting ........................................ 10
■ Call channel programming ......................................... 11
■ Lock function ............................................................. 12
■ Automatic backlighting .............................................. 12
■ Monitor function ......................................................... 12
5 SCAN OPERATION ................................................ 13–14
■ Scan types ................................................................. 13
■ Setting tag channels .................................................. 14
■ Starting a scan .......................................................... 14
6 DUALWATCH/TRI-WATCH .......................................... 15
■ Description ................................................................ 15
■ Operation ................................................................... 15
7 SET MODE ............................................................. 16–20
■ SET mode programming ........................................... 16
■ SET mode items ........................................................ 17
8 BATTERY CHARGING ........................................... 21–24
■ Battery charging ........................................................ 21
■ Battery cautions ......................................................... 21
■ Optional battery case ................................................ 22
■ Optional battery chargers .......................................... 23
9 OPTIONAL SWIVEL BELT CLIP ........................... 25–26
■ MB-87 contents ......................................................... 25
■ To attach .................................................................... 25
■ To detach ................................................................... 26
10 TROUBLESHOOTING ................................................ 27
11 CHANNEL LIST ........................................................... 28
12 SPECIFICATIONS AND OPTIONS .............................. 29
13 DOC.............................................................................. 30
iv
1
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 calls are prohibited under law.
D Privacy
• Information overheard but not intended for you cannot lawfully be used in any way.
• Indecent or profane language is prohibited.
D Radio licenses
(1) SHIP STATION LICENSE
When your craft is equipped with a VHF FM transceiver, 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. This license includes the call sign which is your craft’s identification for 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 near the transceiver or be kept with the operator. Only
a licensed radio operator may operate a transceiver.
However, non-licensed individuals may talk over a transceiver
if a licensed operator starts, supervises, ends the call and
makes the necessary log entries.
A current copy of the applicable government rules and regulations is only required to be on hand for vessels in which a
radio telephone is compulsory. However, even if you are not
required to have these on hand it is your responsibility to be
thoroughly acquainted with all pertinent rules and regulations.
1
SUPPLIED ACCESSORIES AND ATTACHMENTS
To attach the belt clip
To remove the belt clip
Top panel
2
■ Supplied accessories
The following accessories are supplied: Qty.
• Flexible antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
• Handstrap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
• Belt clip (MB-68) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
• Ni-Cd battery pack (BP-224) . . . . . . . . . . . . . . . . . . . . . . 1
• Battery charger (BC-150) . . . . . . . . . . . . . . . . . . . . . . . . . 1
• Screws for the BC-150 (M3.5 × 20) . . . . . . . . . . . . . . . . . 2
• AC adapter (BC-147E)*
• Top panel/Top sheet (double-sided tape)*
*1Not supplied with some versions.
*2Use the top panel with top sheet as a spare. Ask your dealer for
details.
■ Attachments
D Flexible antenna
Connect the supplied flexible antenna to the antenna connector.
CAUTION!
• NEVER HOLD by the antenna
when carrying the transceiver.
• Transmitting without an an-
tenna may damage the transceiver.
1
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
2
. . . . . . . . . 1 set
D Handstrap
Pass the handstrap through
the loop on the side of the
transceiver as illustrated at
right. Facilitates carrying.
D Belt clip
Attach the belt clip to the transceiver as illustrated below.
1
2
2
2 SUPPLIED ACCESSORIES AND ATTACHMENTS
OPEN
L
O
C
K
Screw position
when removing battery
OPEN
LO
C
K
Screw position
when attaching battery
Make sure both the rubber seal (purple) is set to the groove
correctly and dust or else does not adhere to it.
Battery pack
Battery pack
Rubber seal
Groove
Correct position
Incorrect position
NOTE:
When attaching a battery pack, make sure dust or else does
not adhere to the rubber seal. If dust or else is on the seal
when attaching a battery pack, the water resistant may be
reduced.
ï Battery pack
To remove the battery pack:
Turn the screw counterclockwise, then pull the battery pack
in the direction of the arrow as shown below.
NOTE: When removing or attaching the battery pack, use
a coin or flat-blade screwdriver to loosen or tighten the bottom screw.
To attach the battery pack:
Insert the battery pack in the IC-M31 completely, then turn the
screw clockwise.
NEVER remove or insert the battery pack when the transceiver is wet or soiled. This may result water or dust getting into the transceiver/battery pack and may result in the
transceiver being damaged.
3
CAUTION!:
When attaching or removing a battery pack, make sure the
rubber seal is set in the groove of the battery pack correctly. If the seal is not neatly in the groove it may be damaged when attaching the battery pack.
If the seal is damaged, waterproofing is not guaranteed.
r
q
o
u
i
!0
w
y
t
e
Microphone
Function display
(p. 5)
Speaker
■ Front, top and side panels
PANEL DESCRIPTION
q POWER SWITCH [PWR]
Push and hold to turn power ON and OFF.
w ANTENNA CONNECTOR (p. 2)
Connects the supplied antenna.
e SCAN/DUAL KEY [SCN•
• Starts and stops normal or priority scan. (p. 14)
• Enters watch mode when pushed for 1 sec. (p. 15)
• Exits watch mode when pushed during watch operation.
(p. 15)
r TRANSMIT POWER/LOCK KEY [H/L•
• Selects high or low power when pushed. (p. 10)
• Toggles the lock function ON/OFF when pushed for 1
sec. (p. 12)
t VOLUME UP/DOWN KEYS [+]/[–]•
• Adjusts the volume level. (p. 9)
• After pushing [SQL•
level. (p. 9)
y SQUELCH KEY [SQL•
• Push this key, then adjust the squelch level with [+]/[–].
(p. 9)
• Manually opens the squelch for monitoring the channel
while pushed and held. (p. 12)
• While pushing this key, turn power ON to enter the set
mode. (p. 16)
DUAL]
LOCK]
[VOL]
MONI], push to adjust the squelch
MONI]
☞ Continue to the next page.
3
2
3
4
3 PANEL DESCRIPTION
qe
ryt
w
!5 !3!4
i
u
o
!2
!1
!0
!7
!6
■ Front, top and side panels (Continued)
u CHANNEL UP/DOWN KEYS [YY]/[ZZ]•
• Selects an operating channel. (pgs. 7, 8)
• Selects the SET mode condition of the item. (p. 16)
• Checks tag channels or changes scanning direction dur-
ing scan. (p. 14)
• Sets or clears the displayed channel as a tag (scanned)
channel when pushed both keys for 1 sec. (p. 14)
• While pushing this key, turn power ON to clear all tag
channels in the channel group. (p. 14)
i DIAL/CHANNEL GROUP KEY [DIAL]
• Push to return to the channel selection before selecting
the channel 16 or the call channel with [16•
• Selects one of 2 regular channel groups in sequence
when pushed for 1 sec. (p. 8)
- International, U.S.A.*1(or ATIS*2) channels are available.
*1Available for the UK version only
*2Available for the German version only
o CHANNEL 16 KEY [16•C]
• Selects Channel 16 when pushed. (p. 7)
• Selects the call channel when pushed for 1 sec. (p. 7)
• Enters call channel programming condition when the call
channel is selected and this key is pushed for 3 sec.
(p. 11)
• Exits set mode when pushed during set mode operation.
(p. 16)
!0 PTT SWITCH [PTT]
Push and hold to transmit; release to receive.
5
[TAG]
■ Function display
C].
q TRANSMIT INDICATOR (p. 10)
Appears while transmitting.
w BUSY INDICATOR
Appears when receiving a signal or when the squelch
opens. (p. 10)
“” blinks while monitoring. (p. 12)
e TAG CHANNEL INDICATOR (p. 14)
Appears when a tag channel is selected.
r CALL CHANNEL INDICATOR (p. 7)
Appears when the call channel is selected.
PANEL DESCRIPTION
Indication
Full Middle
Charging
required
No battery
Battery level
blinks when the battery is exhaustion.
blinks when the battery over charged.
3
t LOCK INDICATOR (p. 12)
y BATTERY INDICATOR
u SCAN INDICATOR (p. 14)
i DUALWATCH/TRI-WATCH INDICATORS (p. 15)
o DUPLEX INDICATOR
!0 SUB CHANNEL READOUT
Appears while the lock function is activated.
Indicates remaining battery power.
Blinks while scanning.
“DUAL” appears during dualwatch; “TRI” appears during
tri-watch.
Appears when a duplex channel is selected.
• Indicates Channel 16 during priority scan, dualwatch or
tri-watch. (p. 15)
• Indicates the SET mode item while in SET mode. (p. 16)
• Indicates the squelch level while squelch setting. (p. 9)
• Indicates the volume level while volume setting. (p. 9)
!1 SQUELCH LEVEL INDICATOR
Shows the squelch level.
!2 VOLUME LEVEL INDICATOR
Shows the volume level.
!3 VOLUME LEVEL ADJUSTING INDICATOR
Blinks while adjusting the volume level.
!4 SQUELCH LEVEL ADJUSTING INDICATOR
Blinks while adjusting the squelch level.
!5 CHANNEL NUMBER READOUT
• Indicates the selected operating channel number.
• In SET mode, indicates the selected condition.
!6 CHANNEL GROUP INDICATOR (p. 8)
“I” appears when International; “U” appears when U.S.A.
(U.K. version only); “ATIS” appears when the channel
group in which ATIS function is activated (German version
only).
!7 LOW POWER INDICATOR (p. 10)
• “LOW” appears when low power is selected.
• “LOW” blinks when switching forced low power mode be-
cause of a high temperature error or low voltage.
3
6
4
Channel 16 is the default setting.
(depending on version)
C
Push
for 1 sec.
C
Push
BASIC OPERATION
■ Channel selection
IMPORTANT!: Prior to using the transceiver for the first
time, the battery pack must be fully charged for optimum
life and operation. To avoid damage to the transceiver, turn
the power OFF while charging.
D Channel 16
Channel 16 (Distress channel) is used for establishing initial
contact with another station and for emergency communications. Channel 16 is automatically monitored during both dualwatch and tri-watch. While standing by, you must monitor
Channel 16.
q Push [16•
w Push [DIAL] to return to the condition before selecting
Channel 16, or push [Y]/[Z] to select the operating channel.
7
C] to select Channel 16.
D Call channel
Each regular channel group has a separate call channel. In
addition, the call channel is monitored during tri-watch. The
call channels can be re-programmed (p. 11) and are used to
store your most often used channels in each channel group
for quick recall.
q Push [16•
lected channel group.
•“CALL” and the call channel number appear.
• Each channel group may have its own call channel after pro-
gramming a call channel. See the “Call channel programming”
on p. 11 for details.
w Push [DIAL] to return to the condition before selecting the
call channel, or push [Y]/[Z] to select the operating channel.
C] for 1 sec. to select the call channel in the se-
1
U.S.A channels*
1
International channels
ATIS channels*
2
Push
for 1 sec.
Push
for 1 sec.
D International, U.S.A.*
and ATIS*2channels
There are 57 (58)*1International, 58 U.S.A.*1and 57 ATIS*
channels. These channel groups may be specified for the operating area.
q Push [DIAL] to select a regular channel.
w Push [Y]/[Z] to select a channel.
•“DUP” appears for duplex channels.
e To change the channel group, push [DIAL] for 1 sec.
• International, U.S.A.*1and ATIS*2channels can be selected in
sequence.
BASIC OPERATION
2
4
4
1
Available for the UK version only
*
*2Available for the German version only
8
4 BASIC OPERATION
Blinks during squelch
level adjustment.
Indicates the
squelch level.
Blinks during volume
level adjustment.
Indicates the
volume level.
■ Adjusting the volume level
The volume level can be adjusted with [+]/[–].
➥ Push [+]/[–] to adjust the volume level.
•“VOL” indicator starts blinking.
• There are 32 volume levels to choose.
• When no key is pushed for 5 sec., the transceiver returns to nor-
mal condition.
9
■ Adjusting the squelch level
The IC-M31 has a squelch level adjustment, even though there
is no control knob for it. In order to receive signals properly, as
well as for the scan to function effectively, the squelch must be
adjusted to the proper level.
q Push [SQL•
- “SQL” indicator starts blinking.
- There are 11 squelch levels to choose from: “OP” is completely
open; “10” is tight squelch; “1” is loose squelch level.
- When no key is pushed for 5 sec., the transceiver returns to normal condition.
w Push [SQL•MONI] again to return to normal condition.
✔
CONVENIENT!
The squelch level adjustment key can be selected from
[Y]/[Z] and [+]/[–] with following operation.
• While pushing both [SQL•
to set [Y]/[Z] to the squelch level adjustment key.
• While pushing both [SQL•
to set [+]/[–] to the squelch level adjustment key.
MONI], then adjust the squelch level with [+]/[–].
MONI] and [Y], turn the power ON
MONI] and [+], turn the power ON
■ Receiving and transmitting
q Power ON
e Set channel
t Push to
transmit
y Release to
receive
r Set output
power
w Set volume
w Set the
squelch level
w Set the squelch
level
Microphone
BASIC OPERATION
4
CAUTION: Transmitting without an antenna may
damage the transceiver.
q Push and hold [PWR] to turn power ON.
w Set the volume and squelch levels.
➥ Push [SQL•
➥ Push [SQL•
➥ Push [SQL•
e Push [Y]/[Z] to select the desired channel.
- When receiving a signal, “” appears and audio is emitted
- Further adjustment of the volume may be necessary at this point.
r Push [H/L•LOCK
- “LOW” appears when low power is selected; no indication when
- Choose low power to conserve battery power, choose high
- Some channels are for low power only.
t Push and hold [PTT] to transmit, then speak into the
microphone.
-
- Channel 70 cannot be used for transmission.
y Release [PTT] to receive.
MONI], and push [–] to open the squelch.
MONI] to stop “SQL” indicator blinking, then
push [+]/[–] to set the volume level.
MONI], and push [+]/[–] to set the squelch
level.
from the speaker.
] to select the output power if necessary.
high power is selected.
power for longer distance communications.
“”appears.
IMPORTANT: To maximize the readability of your transmitted signal, pause a few sec. after pushing [PTT], hold
the microphone 5 to 10 cm from your mouth and speak
into the microphone at a normal voice level.
NOTE: The transceiver has a power save function to conserve the battery power. The power save function activates
automatically when no signal is received for 5 sec.
4
10
4 BASIC OPERATION
■ Call channel programming
The call channel key is used to select the default channel,
however, you can program your most often-used channel in
each channel group for quick recall.
q Push [DIAL] for 1 sec. several
times to select the desired channel group (INT, USA, ATIS) to be
programmed.
w Push [16
call channel.
•“CALL” and call channel number ap-
pear.
e Push [16•C] again for 3 sec. (until
a long beep changes to 2 short
beeps) to enter call channel programming condition.
• Call channel number to be programmed flashes.
r Push [Y]/[Z] to select the desired
channel.
] for 1 sec. to select the
•C
t Push [16
played channel as the call channel.
• The call channel number stop flashing.
•C] to program the dis-
11
BASIC OPERATION
MONI
Push
for 1 sec.
Blinks while the monitor
function is used.
LOCK
Push
for 1 sec.
Appears while the
lock function is used.
4
■ Lock function
This function electronically locks all keys (except for [+]/[–],
[PTT], [SQL•
channel changes and function access.
➥ Push [H/L•LOCK] for 1 sec. to turn the lock function ON
and OFF.
MONI] and [H/L•LOCK]) to prevent accidental
■ Automatic backlighting
This function is convenient for nighttime operation. The automatic backlighting can be activated in SET mode. (p. 18)
➥ Push any key except for [PTT] to turn the backlighting ON.
• The backlighting is automatically turned OFF after 5 sec. of inactivity.
■ Monitor function
The monitor function releases the noise squelch mute. See
p. 18 for details of the monitor switch action.
➥ Push [SQL•MONI] for 1 sec. to activate the monitor func-
tion.
•“ ” blinks and audio is emitted.
4
12
5
CH 88
CH 01
CH 16
CH 02
CH 05 CH 04
CH 03
CH 01 CH 02
CH 88
CH 05 CH 04
CH 03
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.
In addition, an auto scan function is available for standby
convenience.
PRIORITY SCAN
Priority scan searches through all tag channels in sequence
while monitoring Channel 16. When a signal is detected on
Channel 16, scan pauses until the signal disappears; when
a signal is detected on a channel other than Channel 16,
scan becomes dualwatch until the signal disappears.
Set the tag channels (scanned channel) before scanning.
Clear the tag channels which inconveniently stop scanning,
such as digital communications.
Choose priority or normal scan in SET mode. (p. 17)
NORMAL SCAN
Normal scan, like priority scan, searches through all tag
channels in sequence. However, unlike priority scan, Channel 16 is not checked unless Channel 16 is set as a tag
channel.
13
SCAN OPERATION
Scan starts.
DUAL DUAL
Push Push
to stop the scan
Receiving a signal
and audio is emitted.
[Example]: Starting a normal scan.
5
■ Setting tag channels
For more efficient scanning, add desired channels as tag
channels or clear the tag for unwanted channels. Non-tag
channels will be skipped during scanning.
Tag channels can be assigned to each channel group (INT,
USA, ATIS) independently. (Depending on version)
q Select the desired channel group (INT, USA, ATIS) by
pushing [DIAL] for 1 sec., if desired.
w Select the desired channel to set as a tag channel.
e Push both [Y] and [Z] for 1 sec. to set the displayed chan-
nel as a tag channel.
•“ ” appears in the function display.
r To cancel the tag channel setting, push both [Y] and [Z]
for 1 sec.
•“ ” disappears.
✔ Clearing all tag channels in the selected channel group
While pushing and holding both [Y] and [Z], turn power ON
to clear all tag channels in the channel group.
■ Starting a scan
Set the priority scan function, scan resume timer and auto
scan function in advance, using SET mode. (pgs. 17, 18)
q Select the desired channel group (INT, USA, ATIS) by
pushing [DIAL] for 1 sec., if desired. (Available for the UK
and German version only)
w Push [SCN•
•“SCAN” blinks in the function display.
•“16” appears on the sub channel readout during priority scan.
• When a signal is received, scan pauses until the signal disap-
pears or resumes after pausing 5 sec. according to scan resume
timer setting. (Channel 16 is still monitored during priority scan.)
• Push [Y]/[Z] to check the scanning tag channels, change the
scanning direction or resume the scan manually.
e To stop the scan, push [SCN•DUAL].
•“SCAN” disappears.
• Pushing [PTT], [16•C] or [DIAL] also stops the scan.
DUAL] to start priority or normal scan.
5
14
6
Dualwatch Tri-watch
Call channel
Tri-watch starts.
Push
for 1 sec.
Signal is received
on the call channel.
Signal received on
Channel 16 takes
priority.
Tri-watch resumes
after the signal
disappears.
DUAL
DUALWATCH/TRI-WATCH
■ Description
Dualwatch monitors Channel 16 while you are receiving
another channel; tri-watch monitors Channel 16 and the call
channel while receiving another channel.
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 channel during dualwatch/triwatch, push and hold [PTT].
■ Operation
q Select the desired operating channel.
w Push [SCN
(depending on SET mode setting).
•“DUAL” blinks during dualwatch; “TRI” blinks during tri-watch.
• A beep tone sounds when a signal is received on Channel 16.
• Tri-watch becomes dualwatch when receiving a signal on the call
channel.
e To cancel dualwatch/tri-watch, push [SCN•DUAL] again.
[Example]: Operating tri-watch on INT channel 07.
•DUAL] for 1 sec. to start dualwatch or tri-watch
15
■ SET mode programming
SET MODE
7
SET mode is used to change the condition of 11 transceiver
functions: beep tone function, priority scan function, scan resume timer, auto scan function, dual/tri-watch function, monitor switch action, automatic backlighting, LCD contrast selection, power save function, self check function and battery
voltage indicator.
D SET MODE ITEMS The displays show the default settings, and the selected item is displayed in the dotted circle.
Beep tone
Priority scan
Scan resume timer
Starting item
: Push
: Push and
Battery voltage
Self check
Power save LCD contrast
D SET mode operation
q Turn power OFF.
w While pushing [SQL•
mode.
• “bp” appears.
e Push [SQL•
sired item, if necessary.
r Push [Y]/[Z] to select the desired condition of the item.
t To exit SET mode, push [16•
MONI
MONI
MONI] or [SQL•MONI] and [Y] to select the de-
Auto scan
MONI], turn power ON to enter SET
C].
Dual/Tri-watch
Monitor switch
Auto backlight
6
7
16
7 SET MODE
Push
Scan resume timer OFF
(default)
Scan resume timer ON
Push
Normal scanPriority scan (default)
Push
Beep tone ON (default)
Beep tone OFF
User beep
■ SET mode items
D Beep tone function “bP”
You can select silent operation by turning the beep tones
OFF, or you can have 2 types of confirmation beeps sound at
the push of a switch. When ON is selected, a fixed beep (Pi)
sounds, and when US is selected, the preset beeps (e.g. do,
re, mi) sound.
• Beep tone synchronises with the volume level.
• The beeps sound during call channel programming even if this func-
tion is turned OFF.
17
D Priority scan function “Pr”
The transceiver has 2 scan types—normal (OFF) and priority
(ON) scans. Normal scan searches all tag channels in the selected channel group. Priority scan searches all tag channels
in sequence while monitoring Channel 16.
D Scan resume timer “St”
The scan resume timer can be set as a pause (OFF) or timer
scan (ON). When OFF is selected, the scan pauses until a
received signal disappears. When ON is selected, the scan
pauses for 5 sec. after receiving a signal and then resumes
even if the signal has been received.
SET MODE
Push
Auto backlighting ON
(default)
Auto backlighting OFF
Push
Push setting (default) Hold setting
Push
Dualwatch function
(default)
Tri-watch function
Push
Auto scan OFF (default) Auto scan ON
7
D Auto scan function “AS”
The auto scan function starts the desired scan automatically
when no signal is received, and no operation is performed for
30 sec.
D Dual/Tri-watch function “dt”
This item selects dual or tri-watch as desired. See p. 15 for
details.
D Monitor switch action “Sq”
The monitor switch action cuts off the squelch function temporarily. This switch action contains PUSH (Pu) or HOLD (Ho)
settings as shown below.
• Pu (PUSH): After pushing the [SQL•MONI] for 1 sec., the squelch
opens and emits audio. The squelch is held open while
continuously pushing and holding [SQL•MONI]. (default)
• Ho (HOLD): After pushing the [SQL•MONI] for 1 sec., the squelch
opens and emits audio even [SQL•MONI] is released.
To close the squelch, push any key.
D Automatic backlighting “bL”
This function is convenient for nighttime operation. The automatic backlighting turns the backlighting ON when any key
except for [PTT] is pushed.
•
The backlighting is automatically turned OFF after 5 sec. of inactivity.
7
18
7 SET MODE
Temperature error Battery voltage error Water intrusion error
Push
Self check OFF (default) Self check ON
Push
Power save ON
(default)
Power save OFF
Push
LCD contrast ON
(default)
LCD contrast OFF
D LCD contrast selection “LC”
The contrast of the LCD can be turned ON (high contrast) and
OFF (low contrast).
D Power save function “PS”
The power save function reduces current drain by deactivating the receiver circuit for preset intervals.
• ON : The power save function is turned ON. The power save function will activate when no signal is received, and no operation
is performed for 5 sec.
• OFF: The power save function is turned OFF.
D Self check function “SC”
The self check function checks transceiver conditions by itself, and informs you in case a problem is found. The following items are checked after the power is turned ON, then it
switches to operation mode.
• Temperature : Outside of –25°C to +65°C (approx.)
• Connected battery voltage
• Water intrusion
When error messages as shown below are displayed, see
troubleshooting for advice. (p. 27)
19
D Battery voltage indicator “bt”
Indication Switch
Beep tone function
Function
Priority scan function
Scan resume timer
Auto scan function
Dual/Tri-watch function
Monitor switch action
Automatic backlighting
LCD contrast selection
Power save function
Self check function
OFF / ON* / US
OFF / ON*
OFF* / ON
OFF* / ON
Dual* / Tri
Push* / Hold
OFF / ON*
OFF / ON*
OFF / ON*
OFF* / ON
OFF* / ON
"bP"
"Pr"
"St"
"AS"
"dt"
"Sq"
"bL"
"LC"
"PS"
"SC"
"bt"
Battery voltage indicator
SET MODE LIST
*Default setting
Battery voltage
indication OFF
(default)
Push
Battery voltage
indication ON
The voltage of the connected battery pack can be turned ON
(displayed for 2 sec.) or OFF (non-displayed) after power is
turned ON.
SET MODE
7
7
20
8
BATTERY CHARGING
■ Battery charging
Prior to using the transceiver for the first time, the battery
pack must be fully charged for optimum life and operation.
CAUTION: To avoid damage to the transceiver, turn the
power OFF while charging.
• Recommended temperature range for charging:
+10°C to +40°C
• Use the specified chargers (BC-150, BC-119N and BC-
121N). NEVER use another manufacture’s charger.
• Use the supplied AC adapter (BC-147E) for BC-150.
NEVER use another manufacture’s adapters.
NEVER connect DC power to the battery case when in-
stalling alkaline batteries. Such a connection will damage
the transceiver.
■ Battery cautions
CAUTION! NEVER insert battery pack/transceiver
(with the battery pack attached) with wet or soiled into the
charger. This may result in corrosion of the charger terminals
or damage to the charger. The charger is not waterproof and
water can easily get into it.
NEVER incinerate used battery pack. Internal battery gas
may cause an explosion.
NEVER immerse batteries in water. If the battery pack be-
comes wet, be sure to wipe it dry BEFORE attaching it to the
transceiver.
NEVER short the terminals of the battery pack. Also, cur-
rent may flow into nearby metal objects, such as a necklace,
etc. Therefore, be careful when carrying with, or placing near
metal objects, carrying in handbags, etc.
If your battery pack seem to have no capacity even after
being charged, completely discharge them by leaving the
power ON overnight. Then, fully charge the battery pack
again. If the batteries still do not retain a charge (or very little),
new battery pack must be purchased.
21
BATTERY CHARGING
AC adapter
(BC-147E; Not
supplied with
some version)
IC-M31BP-224
BC-150
Supplied screws
Charge indicator
Lights green when
BP-224 (with/without
IC-M31) is inserted.
8
ï Charging connections
q Attach the BC-150 to a flat surface, such as desk or cabin,
etc., if desired.
w Connect the AC adapter (BC-147E*) as shown below.
*Not supplied with some version.
e Insert the battery pack with/without the transceiver into the
charger.
• The charge indicator lights green.
r Charge the battery pack approx. 8 hours, depending on
the remaining power condition.
DO NOT charge BP-224 more than 12 hours. Otherwise, BP-224 will be damaged. BP-224 must be
charged for 8–12 hours only.
■ Optional battery case
When using a battery case attached to the transceiver, install
6 × AA(R6) size alkaline batteries as illustrated below.
q Remove the battery case from the transceiver.
w Install 6 × AA(R6) size alkaline batteries.
• Be sure to observe the correct polarity.
CAUTION:
• When installing batteries, make sure they are all the
same brand, type and capacity. Also, do not mix new and
old batteries together.
• Keep battery contacts clean. It’s a good idea to clean battery terminals once a week.
8
22
8 BATTERY CHARGING
Screws supplied with
the charger adapter
Desktop charger adapter
Connector
Plug
Not used
■ Optional battery chargers
ï AD-103 installation
q Install the AD-103 desktop charger adapter into the holder
space of the BC-119N/121N.
w Connect the plugs of the BC-119N/121N to the AD-103
desktop charger adapter with the connector, then install
the adapter into the charger with the supplied screws.
23
BATTERY CHARGING
AD-103 charger
adapters are installed
in each slot.
IC-M31
BP-224
DC power cable (OPC-656)
(Connect with the DC power supply;
13.8 V/at least 7 A)
AC adapter
(purchased
separately)
AD-103 charger
adapter is installed
in BC-119N.
AC adapter
(Not supplied with
some versions.)
OPC-515L (for 13.8 V power source) or
CP-17L (for 12 V cigarette lighter socket)
should be purchased separately
IC-M31
BP-224
8
ï Rapid charging with the BC-119N+AD-103
The optional BC-119N provides rapid charging of battery
packs. The following are additionally required.
• AD-103 charger adapter
• An AC adapter (not supplied with BC-119N depending on
version) or the DC cable (OPC-515L/CP-17L)
ï Rapid charging with the BC-121N+AD-103
The optional BC-121N allows up to 6 battery packs to be
charged simultaneously. The following are additionally required.
• Six AD-103 charger adapters
• An AC adapter (BC-124) or the DC power cable (OPC-656)
8
24
9
q w
OPTIONAL SWIVEL BELT CLIP
■ MB-87 contents
Qty.
q Belt clip……………………………………………………… 1
w Base clip …………………………………………………… 1
■ To attach
q Slide the base clip into the plastic loop on the back of the
transceiver as illustrated below.
w Clip the belt clip to a part of your belt and insert the trans-
ceiver into the belt clip until the base clip fitting into the
groove.
e Once the transceiver is locked in place, it swivels as illus-
trated below.
25
■ To detach
➥ Turn the transceiver upside down in the direction of the
arrow and pull out from the belt clip.
RR
CAUTION!
HOLD THE TRANSCEIVER TIGHTLY, WHEN HANGING
OR DETACHING THE TRANSCEIVER FROM THE BELT
CLIP.
Otherwise the transceiver may not be attached to the belt
clip or swivelled properly if the transceiver is accidentally
dropped and the base clip is scratched or damaged.
OPTIONAL SWIVEL BELT CLIP
9
9
26
10
PROBLEM POSSIBLE CAUSE SOLUTION REF.
The transceiver does
not turn ON.
No sound from speaker. • Squelch level is too deep.
Transmitting is impossible, or high power can
not be selected.
The displayed channel
cannot be changed.
Scan does not start. •“TAG” channels are not programmed. • Set the desired channels as “TAG” channels. p. 14
No beeps. • Beep tones are turned OFF. • Set the beep tones to ON (Fix Beep/User
Self check error.
(Temperature)
Self check error.
(Battery voltage)
Self check error.
(Water intrusion)
TROUBLESHOOTING
• The battery is exhausted.
• Bad connection to the battery pack.
• Volume level is too low.
• Speaker has been exposed to water.
• Some channels are for low power or re-
ceive only.
• The battery is exhausted.
• The battery over charged.
• The output power is set to low.
• Lock function is activated. • Push [H/L•
• The temperature is outside of –25°C to
+65°C (approx)
• The connected battery pack’s voltage is
more than 11 V.
• Water has entered the transceiver. • Have the transceiver checked at your local
• Recharge the battery pack.
• Check the connection to the transceiver.
• Set squelch to the threshold point.
• Push [+]/[–] to set a suitable level.
• Drain water from the speaker.
• Change channels.
• Recharge the battery pack.
• Verify the battery voltage is correct.
• Push [H/L•
function.
Beep) in SET mode.
• Leave the transceiver at room temperature
for a while. Turn the power ON to check if the
internal temperature has returned to normal.
• Verify the battery voltage is correct.
distributor or dealer to see whether the transceiver works properly or not.
LOCK] to select high power.
LOCK] for 1 sec. to cancel the
p. 21
p. 3
p. 9
p. 9
pgs. 7,
8, 28
p. 21
p. 10
p. 12
p. 17
—
—
—
—
—
27
CHANNEL LIST
International channels
Frequency (MHz)
CH
Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive
01 156.050 160.650 11 156.550 156.550 21 157.050 161.650
02 156.100 160.700 12 156.600 156.600 22 157.100 161.700
03 156.150 160.750 13 156.650 156.650 23 157.150 161.750
04 156.200 160.800 14 156.700 156.700 24 157.200 161.800
05 156.250 160.850 15
06 156.300 156.300 16 156.800 156.800 26 157.300 161.900
07 156.350 160.950 17
08 156.400 156.400 18 156.900 161.500 28 157.400 162.000
09 156.450 156.450 19 156.950 161.550 37A 157.850 157.850
10 156.500 156.500 20 157.000 161.600
Frequency (MHz)
CH
156.750 156.750 25 157.250 161.850
156.850 156.850 27 157.350 161.950
Frequency (MHz)
CH
60 156.025 160.625
Frequency (MHz)
CH
61 156.075 160.675
62 156.125 160.725
63 156.175 160.775
64 156.225 160.825
65 156.275 160.875
66 156.325 160.925
67 156.375 156.375
68 156.425 156.425
69 156.475 156.475
Rx only
70 156.525
Frequency (MHz)
CH
71 156.575 156.575
72 156.625 156.625
73 156.675 156.675
74 156.725 156.725
156.775 156.775
75
76
156.825 156.825
77 156.875 156.875
78 156.925 161.525
79 156.975 161.575
80 157.025 161.625
Frequency (MHz)
CH
81 157.075 161.675
82 157.125 161.725
83 157.175 161.775
84 157.225
85 157.275 161.875
86 157.325 161.925
87 157.375 157.375
88 157.425 157.425
11
161.825
USA channels (for U.K. version only)
Frequency (MHz)
CH
Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive
01A 156.050 156.050 12
-- - - - - - - 13
03A 156.150 156.150 14 156.700 156.700 24 157.200 161.800 66A 156.325 156.325
-- - - - - - - 15
05A 156.250 156.250 16 156.800 156.800 26 157.300 161.900 68 156.425 156.425 81A 157.075 157.075 88 157.425 162.025
06 156.300 156.300 17
07A 156.350 156.350 18A 156.900 156.900 28 157.400 162.000 70 156.525 83A 157.175 157.175
08 156.400
09 156.450 156.450 20 157.000 161.600 61A 156.075
10 156.500 156.500 20A 157.000 157.000 -- - - - - - -
11 156.550 156.550 21A 157.050 157.050 63A 156.175 156.175 74
Low power only.
156.400 19A 156.950 156.950 37A 157.850 157.850 71 156.575 156.575 84 157.225 161.825
Available for UK version only.
Frequency (MHz)
CH
156.600 156.600 22A 157.100 157.100 64A 156.225 156.225 77 156.875 156.875 86 157.325 161.925
156.650 156.650 23A 157.150 157.150 65A
156.750 156.750 25 157.250 161.850 67 156.375 156.375 80A 157.025 157.025 87A 157.375 157.375
156.850 156.850 27 157.350 161.950 69 156.475 156.475 82A 157.125 157.125 88A 157.425 157.425
Frequency (MHz)
CH
Frequency (MHz)
CH
156.275 156.275 78A 156.925 156.925 86A 157.325 157.325
Rx only
156.075 72 156.625 156.625 84A 157.225 157.225
73 156.675 156.675 85 157.275 161.875
156.725 156.725 85A 157.275 157.275
Frequency (MHz)
CH
79A 156.975 156.975 87 157.375 161.975
Frequency (MHz)
CH
10
11
28
12
SPECIFICATIONS AND OPTIONS
29
■ Specifications
GENERAL
• Frequency coverage : Transmit 156.000–161.450 MHz
• Mode : FM (16K0G3E)
• Channel spacing : 25 kHz
• Power supply requirement : BP-223, BP-224 only
• Current drain (at 7.5 V DC) : TX at 5 W 1.5 A typical
• Frequency stability : ±1.5 kHz (–15°C to +55°C)
• Useable temperature range : –15°C to +55°C
• Dimensions : 61(W) × 135(H) × 41(D) mm
(projections not included)
• Weight (approx.; with BP-224) : 360 g
TRANSMITTER
• Output power (at 7.5 V DC) : 5 W (Hi), 1 W (Low) or
• Modulation system :
• Max. frequency deviation : ±5 kHz
• Adjacent channel power : 70 dB
• Spurious emissions : Less than 0.25 µW
RECEIVER
• Receive system : Double-conversion superheterodyne
• Sensitivity (20 dB SINAD) : –2 dBµ EMF (typical)
•
Squelch sensitivity (at threshold)
• Intermodulation rejection ratio : 68 dB
•
Spurious response rejection ratio
• Adjacent channel selectivity : 70 dB
• Audio output power : 0.2 W at 10% distortion with
All stated specifications are subject to change without notice or obligation.
Specifications are measured in accordance with EN 301-178
Receive 156.000–163.425 MHz
TX at 1 W 0.7 A typical
Max. audio 200 mA typical
Power save 20 mA typical
1 W (Hi), 0.5 W (Low) <German ver.>
Variable reactance frequency modulation
: 0 dBµ EMF (typical)
: 70 dB
an 8 Ω load
■ Options
• BP-223
• BP-224 Ni-Cd
• BC-119N
• BC-121N
• BC-150
• MB-68
• MB-74N
• MB-87
• CP-17L
• OPC-515L (for BC-119N)/OPC-656 (for BC-121N)
BATTERY CASE
Battery case for 6 × AA (R6) alkaline cells.
BATTERY PACK
7.2 V/750 mAh Ni-Cd battery pack.
+ BC-145
DESKTOP CHARGER
AC ADAPTER
+ AD-103
CHARGER ADAPTER
For rapid charging of battery packs. An AC adapter is supplied with
the charger depending on versions. Charging time: approx. 1.5 to 2
hours
+ BC-124
MULTI-CHARGER
AC ADAPTER
+ AD-103
CHARGER ADAPTER
(6 pcs.)
For rapid charging of up to 6 battery packs (six AD-103’s are required) simultaneously. An AC adapter should be purchased separately. Charging time: approx. 1.5 to 2 hours
DESKTOP CHARGER
+ BC-147E
AC ADAPTER
Used for regular charging of battery pack.
Charging time: approx. 8 hours
BELT CLIP
The same as supplied with the transceiver.
BELT CLIP
Exclusive alligator-type belt clip.
SWIVEL BELT CLIP
Belt clip for swivel type.
CIGARETTE LIGHTER CABLE
(For BC-119N)
Allows to charge the battery pack through a 12 V cigarette lighter
socket.
DC POWER CABLES
Allows to charge the battery pack using 13.8 V power source instead of the AC adapter.
DOC
DECLARATION
OF CONFORMITY
We Icom Inc. Japan
1-1-32, Kamiminami, Hirano-ku
Osaka 547-0003, Japan
Kind of equipment:
VHF MARINE TRANSCEIVER
Type-designation: iC-
m31
Signature
Authorized representative name
Place and date of issue
Düsseldorf 29th Aug. 2003
Declare on our sole responsibility that this equipment complies with the
essential requirements of the Radio and Telecommunications Terminal
Equipment Directive, 1999/5/EC, and that any applicable Essential Test
Suite measurements have been performed.
Version (where applicable):
0560
This compliance is based on conformity with the following harmonised
standards, specifications or documents:
i) EN 301 178-2 v1.1.1 (2000-8)
ii) EN 60945 1997
iii) EN 60950 August 1992, A11 1997
iv) EN 300 698-2 v1.1.1 (2000-8)
v)
vi)
vii)
13
CE versions of the IC-M31 which display the
“CE” symbol on the serial number seal, comply with the essential requirements of the European Radio and Telecommunication
Terminal Directive 1999/5/EC.
This warning symbol indicates that this equipment
operates in non-harmonised frequency bands
and/or may be subject to licensing conditions in
the country of use. Be sure to check that you
have the correct version of this radio or the correct programming of this radio, to comply with national licensing requirement.
12
13
30
A-6298D-1EU
< Intended Country of Use >
GER
AUT
GBR
IRL
NOR
FRA
NED
BEL
LUX
ESP
POR
ITA
GRE
SWE
DEN
FIN
SUI
Printed in Japan
© 2003 Icom Inc.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan
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