Icom IC-M422 User Manual

INSTRUCTION MANUAL

VHF MARINE TRANSCEIVER

iM422

FOREWORD

IMPORTANT

Thank you for purchasing this Icom product. The
IC-M422
with Icom’s state of the art technology and craftsmanship.
With proper care, this product should provide you with years
of trouble-free operation.

We want to take a couple of moments of your time to thank
you for making the IC-M422 your radio of choice, and hope
you agree with Icom’s philosophy of “technology first.” Many
hours of research and development went into the design of
your IC-M422.

D

VHF MARINE TRANSCEIVERS

FEATURES

are designed and built

❍ Simple operation with large keys

❍ Easy to hear speaker

❍ Built-in DSC meets RTCM SC101 requirement

❍ Rugged waterproof construction

❍ Optional COMMANDMIC II™

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.
COMMANDMIC II is a trademark of Icom Incorporated (Japan) in the United
states.

i

READ ALL INSTRUCTIONS carefully and completely

before using the transceiver.

SAVE THIS INSTRUCTION MANUAL — This in-

struction manual contains important operating instructions for
the IC-M422.

EXPLICIT DEFINITIONS

WORD DEFINITION

R WARNING!

CAUTION

NOTE

CLEAN THE TRANSCEIVER AND MICROPHONE THOR­OUGHLY WITH FRESH WATER after exposure to water

including salt water, otherwise, the keys and switches may
become inoperable due to salt crystallization.

Personal injury, fire hazard or electric shock
may occur.

Equipment damage may occur.

Recommended for optimum use. No risk of
personal injury, fire or electric shock.

IN CASE OF EMERGENCY

WARNING
STICKER

NOTE

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 (AND 9­digit DSC ID if you have one).

4. “LOCATED AT ...............” (your position)

5. The nature of the distress and assistance required.

6. Any other information which might facilitate the rescue.

Or, transmit your Distress call using digital selective calling
on Channel 70.

USING DIGITAL SELECTIVE CALLING (Ch 70)

DISTRESS CALL PROCEDURE

1. While lifting up 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 on Channel 70 from a
coast station.

• After the acknowledgement is received, Channel 16 is

automatically selected.

3. Push and hold [PTT], then transmit the appropriate
information as listed above.

A WARNING STICKER is supplied with the transceiver.
To comply with FCC regulations, this sticker must be affixed in
such a location as to be readily seen from the operating con­trols of the radio as in the diagram below. Make sure the cho­sen location is clean and dry before applying the sticker.
(p. 36)

EXAMPLE

ii

RADIO OPERATOR WARNING

WARNING

Icom requires the radio operator to meet the
FCC Requirements for Radio Frequency Expo­sure. An omnidirectional antenna with gain not
greater than 9 dBi must be mounted a minimum
of 5 meters (measured from the lowest point of

the antenna) vertically above the main deck and
all possible personnel. This is the minimum safe separation
distance estimated to meet all RF exposure compliance re­quirements. 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.

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 allow­able MPE level set by FCC.

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 EXPO­SURE 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.

Determining MPE Radius
THE MAXIMUM PERMISSIBLE EXPOSURE (MPE) RA­DIUS 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 MAXI­MUM GAIN OF 9dBi ARE USED FOR A SHIP MOUNTED
SYSTEM.

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

1 OPERATING RULES ………………… 1
2 PANEL DESCRIPTION …………… 2–4

■ Front panel ………………………… 2

■ Microphone ………………………… 3

■ Function display …………………… 4

3 BASIC OPERATION ……………… 5–9

■ Channel selection ………………… 5

■ Receiving and transmitting ……… 7

■ Call channel programming………… 8

■ Channel comments………………… 9

■ Microphone Lock function ………… 9

■ Display backlight …………………… 9

4 SCAN OPERATION …………… 10–11

■ Scan types ………………………… 10

■ Setting TAG channels …………… 11

■ Starting a scan …………………… 11

5 DUALWATCH/TRI-WATCH………… 12

■ Description ………………………… 12

■ Operation ………………………… 12

6 DSC OPERATION ……………… 13–29

■ MMSI code programming ……… 13

■ MMSI code check ………………… 13

■ DSC Address ID ………………… 14

■ Position indication………………… 15

■ Distress call ……………………… 16

■ Transmitting DSC calls…………… 17

■ Receiving DSC calls……………… 26

7 OTHER FUNCTIONS ………… 30–31

■ Intercom operation ……………… 30

■ Public Address (PA) function …… 31

■ RX Speaker function …………… 31

8 SET MODE ……………………… 32–34

■ Set mode programming ………… 32

■ Set mode items …………………… 32

9 CONNECTIONS AND

MAINTENANCE ………………… 35–37

■ Connections ……………………… 35

■ Supplied accessories …………… 36

■ Antenna …………………………… 36

■ Fuse replacement ………………… 36

■ Mounting the transceiver ………… 36

■ Optional MB-69 installation ……… 37

10 TROUBLESHOOTING……………… 38
11 SPECIFICATIONS AND

OPTIONS …………………………… 39

■ Specifications …………………… 39

■ Options …………………………… 39

12 COMMANDMIC II™ HM-157 … 40–53

■ Panel description ………………… 40

■ Function display ………………… 42

■ Channel selection ………………… 44

■ Receiving and transmitting ……… 45

■ Call channel programming ……… 46

■ Lock functions …………………… 46

■ Display backlight ………………… 47

■ Monitor function…………………… 47

■ Dualwatch/Tri-watch operation … 47

■ Setting TAG channels …………… 48

■ Starting a scan …………………… 48

■ Set mode programming ………… 49

■ Intercom operation ……………… 50

■ Public Address function ………… 50

■ RX Speaker function …………… 50

■ Channel comments ……………… 51

■ HM-157 supplied accessories…… 51

■ Installation ………………………… 52

13 CHANNEL LIST …………………… 54
14 TEMPLATE ………………………… 55

iv

PRECAUTIONS

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.

NEVER connect the transceiver to a power source of more

than 16 V DC or use reverse polarity. This will ruin the trans­ceiver.

NEVER cut the DC power cable between the DC plug at the

back of the transceiver 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. If the transceiver becomes dusty or dirty, wipe it
clean with a soft, dry cloth.

v

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.

BE CAREFUL! The transceiver and optional HM-157

COMMANDMIC II

responds to IPX waterproof specification, Grade 7
(1 m/30 min.). However, once the transceiver or microphone
has been dropped, waterproofing cannot be guaranteed due
to the fact that the case may be cracked, or the waterproof
seal damaged, etc.

™ employ waterproof construction, which cor-

OPERATING RULES

1

DD

PRIORITIES

• Read all rules and regulations pertaining to priorities and
keep an up-to-date copy handy. Safety and Distress calls
take priority over all others.

• You must monitor Channel 16 when you are not operating
on another channel.

• False or fraudulent distress signals are prohibited and pun­ishable by law.

DD

PRIVACY

• Information overheard but not intended for you cannot law­fully be used in any way.

• Indecent or profane language is prohibited.

DD

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.

(2) OPERATOR’S LICENSE

A Restricted Radiotelephone Operator Permit is the license
most often held by small vessel radio operators when a radio
is not required for safety purposes.

The Restricted Radiotelephone Operator Permit must be
posted or kept with the operator. Only a licensed radio 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.

Keep a copy of the current government rules and regulations
handy.

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 termi­nal, 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.

1

1

2

qwe

r

Speaker

Function
display (p. 4)

!0 oiu y t

PANEL DESCRIPTION

■ Front panel

q CHANNEL 16/CALL CHANNEL KEY [16•9]

➥ Push to select Channel 16. (p. 5)
➥ Push for 1 sec. to select Call channel. (p. 5)

•“CALL” appears when Call channel is selected.

➥ Push for 3 sec. to enter Call channel programming con-

dition when Call channel is selected. (p. 8)

➥ While pushing [CH/WX

nel comment programming condition. (p. 9)

➥ Move the cursor backward while in the channel com-

ment programming condition. (p. 9)

➥ While turning power ON, push to enter Set mode.

(p. 32)

•DUAL], push to enter the chan-

w CHANNEL/WEATHER CHANNEL KEY [CH/WX•

➥ Selects and toggles the regular channel and Weather

channel when pushed momentarily. (p. 6)

➥ Push for 1 sec. to start Dualwatch or Tri-watch. (p. 12)
➥ Push to stop Dualwatch or Tri-watch when either is acti-

vated. (p. 12)

➥ Advance the cursor while in the channel comment pro-

gramming condition. (p. 9)

e DSC/POSITION KEY [DSC•

➥ Push to select the DSC menu. (p. 13)
➥ Push for 1 sec. to show the current position from a GPS

receiver. (p. 15)

r POWER/VOLUME CONTROL [VOL] (p. 7)

➥ Push for 2 sec. to turn power ON and OFF.
➥ Rotate to adjust the audio level.

t SQUELCH CONTROL [SQL]

Rotate to set the squelch threshold level. (p. 7)

y DISTRESS KEY [DISTRESS]

Push for 5 sec. to transmit a Distress call. (p. 16)

u ATTENUATOR/INTERCOM KEY [LO/DX•

➥ Push to toggle the Attenuator function ON or OFF. (p. 7)

•“LOC” appears when the Attenuator function is turned ON.

➥ Push for 1 sec. to activate an optional Intercom func-

tion. (p. 30)

➥ Push and hold to calls the optional HM-157

MIC II

™ while in Intercom mode. (p. 30)

POS]

DUAL

IC]

COMMAND

]

-

2

i PUBLIC ADDRESS/RX SPEAKER KEY [PA•

Speaker

Microphone

w

q

e

➥ Push to turn the Public Address mode ON or OFF. (p. 31)
➥ Push for 1 sec. to turn the RX Speaker mode ON or

OFF. (p. 31)

o SCAN KEY [SCAN•

➥ Push to start and stop Normal or Priority scan.
➥ Push for 1 sec. to set or clear the displayed channel as

a TAG (scanned) channel.

➥ While pushing [HI/LO] on the microphone, push for

3 sec. to clear or set all TAG channels in the selected
channel group.

!0 CHANNEL UP/DOWN KEYS [YY]/[ZZ]•

➥ Push to select the operating channels, Set mode set-

tings, etc. (pgs. 5, 6, 32)

➥ Push and hold [Y] to move upward through the operat-

ing channels continuously.

➥ Push and hold [Z] to move downward through the op-

erating channels continuously.

➥ While pushing [SCAN

the brightness of the LCD and key backlight. (p. 9)

➥ Push both keys to select one of three channel groups

in sequence. (p. 6)

• U.S.A., International and Canadian channels are available.

➥ Checks TAG channels, changes scanning direction or

resumes the scan manually during scan. (p. 11)

➥ Push [Y] or [Z] to adjust the audio level in Public Ad-

dress mode. (p. 31)

➥ While pushing [PA•

audio level in RX Speaker mode. (p. 31)

TAG ] (p. 11)

•TAG], push [Y] or [Z] to adjust

RX ], push [Y] or [Z] to adjust the

RX

[U/I/C]

PANEL DESCRIPTION

2

■ Microphone

]

q PTT SWITCH [PTT]

Push and hold to transmit; release to receive. (p. 7)

w CHANNEL UP/DOWN KEYS [YY]/[ZZ]

➥ Push either key to change the operating memory chan-

nel, Set mode settings, etc. (pgs. 5, 6, 32)

➥ Checks TAG channels, changes scanning direction or

resumes the scan manually during scan. (p. 11)

e TRANSMIT POWER KEY [HI/LO]

➥ Toggles power high and low when pushed. (p. 7)

• Some channels are set to low power only.

➥ While pushing [HI/LO], turn power ON to toggle the Mi-

crophone Lock function ON and OFF. (p. 9)

2

3

2 PANEL DESCRIPTION

!3 !4 !5

t

w

q

r

e

youi

!2
!1

!0

■ Function display

q CHANNEL COMMENT INDICATOR

➥ Channel comment appears and scrolls if programmed.

(p. 9)

➥ “” or “” blinks during Dualwatch or Tri-watch, re-

spectively. (p. 12)

➥ “” or “” appears during Priority or Normal

scan, respectively. (p. 11)
In Set mode, indicates and scrolls the selected item. (p. 9)

➥

w WEATHER CHANNEL INDICATOR (pgs. 6, 33)

➥ “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.

e RX SPEAKER INDICATOR (p. 31)

Appears during the RX Speaker mode.

r LOCAL INDICATOR (p. 7)

4

Appears when the Attenuator function is turned ON.

t LOW BATTERY INDICATOR

Appears when the battery voltage drops to approx. 10 V
DC or below.

y DSC INDICATOR

Indicates the DSC status.

• “DSC” appears when a DSC call is received. (pgs. 25, 26)

• “POS REPLY” appears when a Position Request Reply call or

Position Report Reply call is received. (pgs. 28, 29)

u GPS INDICATOR

➥ Appears while valid position data is received.
➥ Blinks when invalid position data is received.
➥ Disappears when no GPS receiver is connected.

i DUPLEX INDICATOR (p. 6)

Appears when a duplex channel is selected.

o CHANNEL NUMBER READOUT

➥ Indicates the selected operating channel number.

• “” appears when a simplex channel is selected. (p. 6)

➥ In Set mode, indicates the selected condition. (p. 32)

!0 CHANNEL GROUP INDICATOR (p. 6)

Indicates whether a U.S.A. “USA,” International “INT” or
Canadian “CAN” channel is in use.

!1 CALL CHANNEL INDICATOR (p. 5)

Appears when the call channel is selected.

!2 BUSY INDICATOR (p. 7)

Appears when receiving a signal or when the squelch opens.

!3 TRANSMIT INDICATOR (p. 7)

Appears while transmitting.

!4 LOW POWER INDICATOR (p. 7)

Appears when low power is selected.

!5 TAG CHANNEL INDICATOR (p. 11)

Appears when a TAG channel is selected.

■ Channel selection

Push

for 1 sec.

Push

ïï

Channel 16

Channel 16 is the distress and safety channel. It is used for
establishing initial contact with another station and for emer­gency communications. Channel 16 is monitored during both
Dualwatch and Tri-watch. While standing by, you must moni­tor Channel 16.

BASIC OPERATION

ïï

Channel 9 (Call channel)

Each regular channel group has a separate leisure-use call
channel. The call channel is monitored during Tri-watch. The
call channels can be programmed (p. 8) and are used to store
your most often used channel in each channel group for quick
recall.

3

2
3

➥ Push [16•
➥ Push [CH/WX•

9] momentarily to select Channel 16.

DUAL] to return to the condition before select-

ing Channel 16, or push [Y] or [Z] to select an operating
channel.

➥ Push [16•

lected 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•DUAL

lecting call channel, or push [Y] or [Z] to select an oper­ating channel.

9] for 1 sec. to select the call channel of the se-

] to return to the condition before se-

5

3 BASIC OPERATION

Scrolls
Appears

Scrolls
Appears

When Weather alert is OFF.

When Weather alert is ON.

Push once or twice

Push and

ïï

U.S.A., international and Canadian channels

The IC-M422 is pre-programmed with 57 U.S.A., 57 interna­tional and 61 Canadian channels. These channel groups may
be specified for the operating area.

q Push [CH/WX•

• If a weather channel appears, push [CH/WX•DUAL] again.

DUAL] to select a regular channel.

w Push both [Y] and [Z] on the transceiver to change the

channel group, if necessary.

• U.S.A., International and Canadian channel groups can be se­lected in sequence.

e Push [Y] or [Z] to select a channel.

•“DUP” appears for duplex channels.

•“ ” appears when a simplex channel is selected.

ïï

Weather channels

The IC-M422 has 10 weather channels. These are used for
monitoring broadcasts from NOAA (National Oceanographic
and Atmospheric Administration.)

The transceiver can detect a weather alert tone on the se­lected weather channel while receiving the channel, during
standby on a regular channel or while scanning. (p. 33)

q Push [CH/WX•

DUAL] 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. 33)

6

w Push [Y] or [Z] to select a channel.

■ Receiving and transmitting

i

ry

M

u

q

w

rte

BASIC OPERATION

3

CAUTION: Transmitting without an antenna may dam-

age the transceiver.

q Push [VOL] for 2 sec. to turn power ON.
w Set the audio and squelch levels.

➥ Rotate [SQL] fully counterclockwise in advance.
➥ Rotate [VOL] to adjust the audio output level.
➥ Rotate [SQL] clockwise until the noise disappears.

e To change the channel group, push both [Y] and [Z] on

the transceiver. (p. 6)

r Push [Y] or [Z] to select the desired channel. (pgs. 5, 6)

• When receiving a signal, “” appears and audio is emitted
from the speaker.

• Further adjustment of [VOL] may be necessary.

t Push [LO/DX•

ON or OFF, if necessary.

•“LOC” appears when the receive Attenuator function is in use.

y Push [HI/LO] 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.

u Push and hold [PTT] to transmit, then speak into the mi-

crophone (M).

•“ ” appears.

• Channel 70 cannot be used for transmission other than DSC.

i Release [PTT] to receive.

IC] to turn the receive Attenuator function

Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN­NOT be lawfully used by the general public in U.S.A. wa-

ters.

IMPORTANT: To maximize the readability of your trans­mitted 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 (M) at a normal voice level.

3

7

3 BASIC OPERATION

■ Call channel programming

Call channel is used to select Channel 9 (default), however,
you can program the call channel with your most often-used
channels in each channel group for quick recall.

q Push both [Y] and [Z] on

the transceiver one or more
times to select the desired
channel group (U.S.A., In­ternational or Canada) to be
programmed.

w Push [16•

lect the call channel of the
selected channel group.

•“CALL” and call channel num-
ber appear.

e Push [16•9

(until a long beep changes
to 2 short beeps) to enter
the call channel program­ming condition.

• Channel number starts blink­ing.

] for 1 sec. to se-

9

] again for 3 sec.

r Push [Y] or [Z] to select

the desired channel.

t Push [16•

displayed channel as the
call channel.

• Push [CH/WX•DUAL] to can-
cel.

• The channel number stops
blinking.

9] to program the

8

BASIC OPERATION

[HI/LO]

[Y]/[Z]

3

■ Channel comments

Memory channels can be labeled with alphanumeric com­ments of up to 10 characters each for easy channel recogni­tion.

Comments more than 7 characters long automatically scroll
at the channel comment indicator after the channel selection.

Capital letters, small letters (except f, j, k, p, s, v, x, z), 0 to 9,
some symbols (= M + – . /) and space can be used.

q Select the desired channel.

• Cancel Dualwatch, Tri-watch or Scan in advance.

w While pushing [CH/WX•

DUAL], push [16•9

the channel comment.

• A cursor and the first char­acter start blinking alter­nately.

e Select the desired character by pushing [Y] or [Z].

• Push [CH/WX•DUAL] or [16•9] to move the cursor forward or
backward, respectively.

r Repeat step e to input all characters.
t Push [DSC•

• Push [LO/DX•IC] to cancel.

• The cursor and the character stop blinking.

y Repeat steps q to t to program other channel com-

ments, if desired.

] to edit

] to input and set the comment.

POS

■ Microphone Lock function

The Microphone Lock function electrically locks [Y]/[Z] and
[HI/LO] keys on the supplied microphone. This prevents ac-

cidental channel changes and function access.

➥ While pushing [HI/LO] on the microphone, turn power ON

to toggle the Lock function ON and OFF.

■ Display backlight

The function display and keys can be backlit for better visibil­ity under low light conditions.
Display backlight is also adjustable via the Set mode. (p. 34)

➥ While pushing [SCAN

brightness of the LCD and key backlight.

• The backlight is adjustable in 7 levels and OFF.

•TAG], push [Y] or [Z] to adjust the

3

9

4

CH 06

CH 01

CH 16

CH 02

CH 05 CH 04

CH 03

CH 01 CH 02

CH 06

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.

When the Weather Alert function is turned ON, the previously
selected (last used) weather channel is also checked while
scanning. (p. 33)

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 those for digital communication use. (Refer to right
page for details.)

Choose Priority or Normal scan in Set mode. (p. 32)

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.

10

SCAN OPERATION

[Example]: Starting a Normal scan.

Push

Scan starts.

When a signal is
received.

Blinks Blinks

4

■ Setting TAG channels

For more efficient scanning, add the desired channels as TAG
channels or clear the TAG for unwanted channels.
Channels that are not tagged will be skipped during scanning.
TAG channels can be assigned to each channel group (USA,
INT, CAN) independently.

q Push both [Y] and [Z] to select the desired channel group

(USA, INT or CAN.)

w Select the desired channel to be set as a TAG channel.
e Push [SCAN•

as a TAG channel.

•“ ” appears in the display.

r To cancel the TAG channel setting, repeat step e.

•“ ” disappears.

✔ Clearing (or setting) all tagged channels

While pushing [HI/LO] on the microphone, push [SCAN•
for 3 sec. (until a long beep changes to 2 short beeps) to clear
all TAG channels in the channel group.

• Repeat above procedure to set all TAG channels.

TAG ] for 1 sec. to set the displayed channel

■ Starting a scan

Set scan type (Priority or Normal scan) and scan resume
timer in advance, using Set mode. (p. 32)

q Push both [Y] and [Z] to select the desired channel group

(USA, INT, CAN) if desired.

w Set TAG channels as described at left.
e Make sure the squelch is closed to start a scan.
r Push [SCAN•

•“ ” appears at the channel comment indicator during Pri­ority scan.

•“ ” appears at the channel comment indicator during Normal
scan.

• When a signal is detected, scan pauses until the signal disap­pears 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

TAG ]

the scanning direction or resume the scan manually.

• A beep tone sounds and “” blinks at the channel comment in­dicator when a signal is received on Channel 16 during Priority
scan.

t To stop the scan, repeat step r.

TAG ] to start Priority or Normal scan.

4

11

5

Dualwatch Tri-watch

Call channel

Tri-watch starts.

Signal is received on call
channel.

Signal is received on
Channel 16 takes priority.

Tri-watch resumes after
the signal disappears.

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
is convenient for monitoring Channel 16 when you are oper­ating on 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 Dualwatch or Tri-watch in Set mode. (p. 33)
w Push [Y] or [Z] to select the desired operating channel.
e Push [CH/WX•

watch.

•“ ” blinks during Dualwatch; “” blinks during Tri-watch.

• A beep tone sounds when a signal is received on Channel 16.

r To cancel Dualwatch/Tri-watch, push [CH/WX•DUAL] again.

[Example]: Operating Tri-watch on INT Channel 25

DUAL] for 1 sec. to start Dualwatch or Tri-

12

DSC OPERATION

MMSI (DSC self ID) code scrolls

6

■ MMSI code programming

The 9-digit MMSI (Maritime Mobile Service Identity: DSC self
ID) code can be programmed at power ON.

This function is not available when the MMSI code has
been programmed by the dealer. This code programming
can be performed only twice.

q Turn power OFF.
w While pushing [DSC•

code programming condition.

e After the display appears, release [DSC•

• A cursor starts blinking.

r Enter the specified MMSI code by pushing [Y] or [Z].

• Push [CH/WX•DUAL] or [16•9] to move the cursor forward or

backward, respectively.

t Input 9-digit code, then push [DSC•POS] to set the code.

• Returns to the normal operation.

POS], turn power ON to enter MMSI

POS].

■ MMSI code check

The 9-digit MMSI (DSC self ID) code can be checked.

q Push [DSC•
w Push [Y] or [Z] to select “” and push [DSC•

e Check the 9-digit MMSI (DSC self ID) code.

• The MMSI code is displayed and scrolls at the channel comment
indicator.

r Push [DSC•POS] to exit the DSC menu.

POS] to enter the DSC menu.

POS].

5
6

13

6 DSC OPERATION

■ DSC Address ID

A total of 100 DSC address IDs (9-digit) can be programmed
and named with up to 7 characters.

D Programming Address ID

q Push [DSC•POS] to enter the DSC menu.
w Push [Y] or [Z] to select “ ,” push [DSC•

e Push [Y] or [Z] to select “ ,” push [DSC•

POS].

POS].

r Push [Y] or [Z] to set the 9-digit Individual/Group ID.

• Push [CH/WX•DUAL] or [16•9] to move the cursor forward or
backward, respectively.

• Push [LO/DX•IC] to cancel and exit the condition.

1st digit ‘0’ is fixed for a Group ID. When you input 1st digit ‘0’
and other 8 digits, the ID is automatically registered as a
Group ID.

t After entering the 9-digit code, push [DSC•POS

to a 7-character ID name using [Y] or [Z].

• Push [CH/WX•DUAL] or [16•9] to move the cursor forward or
backward, respectively.

• Push [LO/DX•IC] to cancel and exit the condition.

y Push [DSC•POS] to program and exit the DSC menu.

] to set up

14

DSC OPERATION

Scrolls

6

D Deleting Address ID

q Push [DSC•POS] to enter the DSC menu.
w Push [Y] or [Z] to select “ ,” and push [DSC•

e Push [Y] or [Z] to select “ ,” push [DSC•

• When no address ID is programmed, “” is displayed.

r Push [Y] or [Z] to select the desired ID name for deleting

and push [DSC•

• “” appears.

t Push [DSC•POS] to delete the address ID and exit the

DSC menu.

POS

].

POS].

POS].

■ Position indication

When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is con­nected, the transceiver displays the current position data in
seconds of accuracy.

A NMEA0183 ver. 2.0 or 3.01 (sentence formatters RMC,
GGA, GNS, GLL) compatible GPS receiver is required. Ask
your dealer about suitable GPS receivers.

➥ Push [DSC•

•‘Latitude’ and ‘Longitude’ scroll in sequence at the channel com-
ment indicator.

• “” scrolls when no GPS is connected.

• When the connected GPS receiver is compatible with

several sentence formatters, the order of input prece­dence is ‘RMC,’‘GGA,’‘GNS’ and ‘GLL.’

• “GPS” blinks when the GPS data is invalid.

POS] for 1 sec. to display the current position.

6

15

6 DSC OPERATION

Scrolls

Scrolls

■ Distress call

A Distress call should be transmitted, if in the opinion of the
Master, the ship or a person is in distress and requires imme­diate assistance.

NEVER USE THE DISTRESS CALL WHEN YOUR
SHIP OR A PERSON IS NOT IN AN EMERGENCY.
A DISTRESS CALL CAN BE USED ONLY WHEN
IMMEDIATE HELP IS NEEDED.

q Confirm no Distress call is being received.
w While lifting up the key cover, push [DISTRESS] for 5 sec.

to transmit the Distress call.

• Emergency channel (Ch 70) is automatically selected and the
Distress call is transmitted.

• While pushing [DISTRESS], the key backlighting is blinking.

e After transmitting the Distress call, the transceiver waits for

an acknowledgment call on Ch70.

• The Distress call is automatically transmitted every 3.5 to 4.5
minutes.

•“ ” scrolls at the channel comment indicator.

r After receiving the acknowledgment, reply using the mi-

crophone.

• Channel 16 is automatically selected.

•“ ” scrolls at the channel comment indicator.

➥ A distress alert contains;

• Kinds of distress: Undesignated distress

• Position data : Latest GPS position data held for 23.5 hrs.

or until the power is turned OFF.

➥ The Distress call is repeated every 3.5–4.5 min., until re-

ceiving an ‘acknowledgement.’

➥ Push [DISTRESS] to transmit a renewed Distress call,

if desired.

➥ Push [16•

9] to cancel the ‘Call repeat’ mode.

16

■ Transmitting DSC calls

Transmitting

Push

Scrolls

DSC OPERATION

6

To ensure correct operation of the DSC function, please
make sure you set the squelch correctly. (P. 7)

D Transmitting an Individual call

The Individual call function allows you to transmit a DSC sig­nal to a specific ship only.

q Push [DSC•
w Push [Y] or [Z] to select “ ,” push [DSC•

e Push [Y] or [Z] to select the desired pre-programmed In-

dividual address, push [DSC•POS].

• The ID code must be set in advance. (p. 13)

POS] to enter the DSC menu.

POS].

r Push [Y] or [Z] to select the desired intership channel,

push [DSC•

• Intership channels are already preset into the transceiver in pre­ferred order.

• After pushing [DSC•POS], Channel 70 is selected and “”
appears at the channel comment indicator.

t Push [DSC•POS] to transmit the Individual call.

• If Channel 70 is busy, the transceiver stands by until the channel
becomes clear.

• Routine category only is available.

POS].

6

17

6 DSC OPERATION

Scrolls

‘Able to comply’ is received.

Scrolls

‘Unable to comply’ is received.

Scrolls

Scrolls

y Stands by on Channel 70 until an acknowledgement is re-

ceived.

•“ ” scrolls at the channel comment indicator.

u When the acknowledgement ‘Able to comply’ is received,

the specified channel (in step r) 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.

•“ ” or “” scrolls at the channel
comment indicator.

D Transmitting an Individual acknowledgement

When receiving an Individual call, you can transmit an ac­knowledgement (‘Able to comply’ or ‘Unable to comply’) by
using the on screen prompts (see page 26 for details). Alter­natively, you can send an acknowledgement through the
menu system as follows.

q Push [DSC•
w Push [Y] or [Z] to select “ ,” push [DSC•

• “” item appears after an Individual call is received.

• “” item disappears if another call is received after the

Individual call.

• The Individual acknowledgement can be transmitted to the last
received Individual call only.

POS] to enter the DSC menu.

POS].

18

i Push any key to stop the beep, then push and hold [PTT]

to communicate your message to the responding ship.

DSC OPERATION

Scrolls

Transmitting

‘ABLE’ is selected.

6

e Push [Y] or [Z] to select the acknowledgement “” or

“ .”

• When “” is selected, the reason “No Reason Given” will

be transmitted.

r Push [DSC•POS] to enter selected Individual call acknowl-

edgement.

• “” appears at the channel comment indicator.

t Push [DSC•POS

the selected station.

] to transmit the acknowledgement call to

y After the Individual acknowledgement call has been trans-

mitted, the specified channel (specified by the calling sta­tion) is selected automatically when “” is selected, or
returns to the previous condition (before entering the DSC
menu) when “” is selected in step e.

6

19

Scrolls

Transmitting

Push

6 DSC OPERATION

D Transmitting a Group call

The Group call function allows you to transmit a DSC signal
to a specific group only.

20

q Push [DSC•
w Push [Y] or [Z] to select “ ,” push [DSC•

POS] to enter the DSC menu.

POS].

e Push [Y] or [Z] to select the desired pre-programmed

Group address, push [DSC•POS

• The ID code must be set in advance. (p. 13)

].

r Push [Y] or [Z] to select the desired intership channel,

and push [DSC•

• Intership channels are already preset into the transceiver in pre­ferred order.

• After pushing [DSC•POS], Channel 70 is selected and “”
appears at the channel comment indicator.

POS].

t Push [DSC•POS] to transmit the Group call.

• If Channel 70 is busy, the transceiver stands by until the channel
becomes clear.

• Routine category only is available.

y After the Group call has been transmitted, the specified

channel (in step r) is selected automatically.

u Push and hold [PTT] to communicate your message to the

responding ship.

D Transmitting an All Ships call

Transmitting

Scrolls

Large ships use Channel 70 as their ‘listening channel.’
When you want to announce a message to these ships, use
the

‘

All Ships call’ function.

DSC OPERATION

r Push [DSC•POS] to transmit the All Ships call.

• Routine category only is available.

6

q Push [DSC•
w Push [Y] or [Z] to select “ .”

e Push [DSC•

Ships call.

• Channel 70 is selected and “” appears at the channel
comment indicator.

POS] to enter the DSC menu.

POS] to enter the standby condition for All

6

t After the All Ships call has been transmitted, Channel 16 is

selected automatically.

21

6 DSC OPERATION

Scrolls

Transmitting

Scrolls

D Transmitting a Position Request call

Transmit a Position Request call when you want to know a
specified ship’s current position, etc.

q Push [DSC•
w Push [Y] or [Z] to select “ ,” push [DSC•

e Push [Y] or [Z] to select the desired pre-programmed In-

dividual address.

• The ID code must be set in advance. (p. 13)

POS] to enter the DSC menu.

POS].

r Push [DSC•POS] to enter the standby condition for Posi-

tion Request call.

• Channel 70 is selected and “” appears at the channel
comment indicator.

t Push [DSC•POS] to transmit the Position Request call.

y After the Position Request call has been transmitted, the

following indication is displayed.

•“ ” scrolls at the channel comment indicator.

22

u Push any key to exit the condition and return to the previ-

ous indication before entering the DSC menu.

D Transmitting a Position Report call

Scrolls

Transmitting

Scrolls

Transmit a Position Report call when you want to announce
your own position to a specific ship and to get an answer, etc.

q Push [DSC•
w Push [Y] or [Z] to select “ ,” push [DSC•

e Push [Y] or [Z] to select the desired pre-programmed In-

dividual address.

• The ID code must be set in advance. (p. 13)

POS] to enter the DSC menu.

POS].

DSC OPERATION

r Push [DSC•POS] to enter the standby condition for Posi-

tion Report call.

• Channel 70 is selected and “” appears at the channel
comment indicator.

t Push [DSC•POS] to transmit the Position Report call.

y After the Position Report call has been transmitted, the fol-

lowing indication is displayed.

•“ ” scrolls at the channel comment indicator.

6

6

u Push any key to exit the condition and return to the previ-

ous indication before entering the DSC menu.

23

6 DSC OPERATION

Scrolls

Transmitting

Scrolls

D Transmitting a Polling Request call

Transmit a Polling Request call when you want to know a
specific ship is in the communication area, etc.

q Push [DSC•
w Push [Y] or [Z] to select “ ,” push

[DSC•

e Push [Y] or [Z] to select the desired pre-programmed In-

dividual address.

• The ID code must be set in advance. (p. 13)

POS] to enter the DSC menu.

POS].

r Push [DSC•POS] to enter the standby condition for Polling

Request call.

• Channel 70 is selected and “” appears at the channel
comment indicator.

t Push [DSC•POS] to transmit the Polling Request call.

y After the Polling Request call has been transmitted, the fol-

lowing indication is displayed.

•“ ” scrolls at the channel comment indicator.

24

u Push any key to exit the condition and return to the previ-

ous indication before entering the DSC menu.

DSC OPERATION

Scrolls

Scrolls

Scrolls

6

D Transmitting a Position Request Reply call

Transmit a Position Request Reply call when a Position Re­quest call is received.

q When a Position Request call is received, “DSC” appears

and “” scrolls at the channel comment in-
dicator.

w Push [DSC•

push other key to ignore the Position Request call.

POS] to reply to the Position Request call;

D Transmitting a Position Report Reply call

Transmit a Position Report Reply call when a Position Report
call is received.

q When a Position Report call is received, “DSC” appears and

“” scrolls at the channel comment indicator.

D Transmitting a Polling Request Reply call

Transmit a Polling Request Reply call when a Polling Request
call is received.

q When a Polling Request call is received, “DSC” appears

and “” scrolls at the channel com-
ment indicator.

w Push [DSC•

other key to ignore the Polling Request call.

POS] to reply to the Polling Request call; push

6

w Push [DSC•

other key to ignore the Position Report call.

POS] to reply to the Position Report call; push

25

6 DSC OPERATION

Scrolls
Scrolls

Scrolls

Scrolls

26

■ Receiving DSC calls

D Receiving a Distress call

While monitoring Channel 70 and a Distress call is received:
➥ The emergency alarm sounds for 2 minutes.

• Push any key to stop the alarm.

➥ “DSC” appears and “” scrolls at the channel

comment indicator, then Channel 16 is selected automati­cally.

➥ Continue monitoring Channel 16 as a coast station may re-

quire assistance.

D Receiving a Distress Acknowledgement

While monitoring Channel 70 and a Distress acknowledge­ment to other ship is received:
➥ The emergency alarm sounds for 2 minutes.

• Push any key to stop the alarm.

➥ “DSC” appears and “” scrolls at the

channel comment indicator, then Channel 16 is selected
automatically.

D Receiving a Distress Relay call

While monitoring Channel 70 and a Distress Relay acknowl­edgement is received:
➥ The emergency alarm sounds for 2 minutes.

• Push any key to stop the alarm.

➥ “DSC” appears and “” scrolls at the channel com-

ment indicator, then Channel 16 is selected automatically.

D Receiving an Individual call

While monitoring Channel 70 and an Individual call is received:
➥ The emergency alarm or beeps sound for 2 minutes de-

pending on the received category.

• Push any key to stop the alarm or beeps.

➥ “DSC” appears and “” scrolls at the chan-

nel comment indicator.

➥ Push [DSC•POS

specified by the calling station for voice communication (de­pending on your replying condition. See p, 18 for Individual
acknowledgement call procedure for details.); push any
other key to ignore the call.

] to reply the call and select the channel

DSC OPERATION

Scrolls

Scrolls

Scrolls

6

D Receiving a Group call

While monitoring Channel 70 and a Group call is received:
➥ The emergency alarm or beeps sound for 2 minutes de-

pending on the received category.

• Push any key to stop the alarm or beeps.

➥ “DSC” appears and “” scrolls at the channel

comment indicator.

➥ Push [DSC•

calling station for voice communication; push any other key
to ignore the call.

POS] to select the channel specified by the

D Receiving an All Ships call

While monitoring Channel 70 and an All Ships call is received:
➥ The emergency alarm sounds for 2 minutes when the cat-

egory is ‘Distress’ or ‘Urgency’; the beeps sound for 2 min-
utes for other categories.

• Push any key to stop the alarm or beeps.

➥ “DSC” appears and “” scrolls at the channel

comment indicator.

➥ Push [DSC•

ment from the calling vessel, push any other key to ignore
the call.

POS] to monitor Channel 16 for an announce-

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 for 2 minutes de-

pending on the received category.

• Push any key to stop the alarm or beeps.

➥ “DSC” appears and “” scrolls at the

channel comment indicator.

➥ Push [DSC•

calling station for voice communication; push any other key
to ignore the call.

➥ Monitor the selected channel for an announcement from

the calling station.

When no GPS receiver is connected or if there is a prob­lem with the connected receiver, all Geographical Area
calls are received, regardless of your position.

POS] to select the channel specified by the

6

27

6 DSC OPERATION

Scrolls

Scrolls

Scrolls

Scrolls

D Receiving a Position Request call

While monitoring Channel 70 and a Position Request call is
received:
➥ “DSC” appears and “” scrolls at the chan-

nel comment indicator.

➥ The beeps sound for 2 minutes.

• Push any key to stop the beeps.

➥ Push [DSC•POS] to reply to the call; push any other key to

ignore the call.

D Receiving a Position Report call

While monitoring Channel 70 and a Position Report call is re­ceived:
➥ “DSC” appears and “” scrolls at the chan-

nel comment indicator.

➥ The beeps sound for 2 minutes.

• Push any key to stop the beeps.

D Receiving a Polling Request call

While monitoring Channel 70 and a Polling Request call is re­ceived:
➥ “DSC” appears and “” scrolls at the

channel comment indicator.

➥ The beeps sound for 2 minutes.

• Push any key to stop the beeps.

➥ Push [DSC•POS] to reply to the call; push any other key to

ignore the call.

D Receiving a Position Request Reply call

While monitoring Channel 70 and a Position Request Reply
call is received:

➥ “DSC” and “POS REPLY” appear in the display.

• The ‘Latitude’ and ‘Longitude’ from the called station is displayed

and scrolled at the channel comment indicator in order of Lati­tude co-ordinates and then Longitude co-ordinates.

• “” scrolls when no GPS is connected.

➥ The beeps sound for 2 minutes.

• Push any key to stop the beeps.

28

➥ Push [DSC•POS] to reply to the call; push any other key to

ignore the call.

D Receiving a Position Report Reply call

Scrolls

Scrolls

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 at the channel comment indicator in order of Latitude
co-ordinates and then Longitude co-ordinates.

• “” scrolls when no GPS is connected.

➥ The beeps sound for 2 minutes.

• Push any key to stop the beeps.

D Receiving a Polling Request Reply call

While monitoring Channel 70 and a Polling Request reply call
is received:
➥ “DSC” appears and “” scrolls at the

channel comment indicator.

➥ The beeps sound for 2 minutes.

• Push any key to stop the beeps.

DSC OPERATION

6

6

➥ Push [DSC•POS] to reply to the call; push any other key to

ignore the call.

29

30

HM-157 (listener)IC-M422 (caller)

HM-157IC-M422

7

OTHER FUNCTIONS

■ Intercom operation

The optional Intercom function allows you to talk to the deck
from the cabin. The optional HM-157
required for Intercom operation.

Connect an optional HM-157 as described on pgs. 35, 52.

• Transmitting is impossible during Intercom operation.

• The received signal is muted during Intercom operation.

q Push [LO/DX•

• The HM-157 power is automatically turned ON, even if the power
is OFF.

w Push [LO/DX•IC] for 1 sec. again to call up the HM-157

side.

• The transceiver and the HM-157 emit call beeps.

e Push and hold [PTT] and speak at a normal voice level

into the microphone.

• “”or “”appears on the caller or listener function dis-

play, respectively.

• To adjust the IC-M422’s speaker output level, rotate [VOL].

• To adjust the HM-157’s speaker output level, push [Y] or [Z]

after pushing [VOL• PA/RX ] on the HM-157.

IC] for 1 sec. to enter Intercom mode.

DIM

COMMANDMIC II

™ is

r After releasing [PTT] you can hear the response through

the speaker.

t To return to the normal operation, push [LO/DX•

mentarily.

• [16•9] and [DISTRESS] keys are also available.

• While in the Intercom mode, the transceiver functions

(transmit and receive) are interrupted. If the transceiver
is in transmit condition, the Intercom function is not avail­able.

• When a DSC call is received, “DSC” appears and the
DSC message is displayed at the channel comment indi­cator after the Intercom use is finished.

• When a WX alert is received, “WX ALT” blinks and a
beep sounds. The WX alert sounds after the Intercom
use is finished.

IC] mo-

OTHER FUNCTIONS

Appears

7

■ Public Address (PA) function

The IC-M422 has a Public Address function for voice amplifi-
cation, making an announcement on-board via an external
speaker or hailer.

Connect an external speaker or hailer as described on p. 35.

• Transmitting is not possible during Public Address mode.

q Push [PA•RX ] to enter the Public Address mode.

w Push and hold [PTT] and speak at a normal voice level

into the microphone.

• “”or “”appears at the channel comment indicator

when [PTT] is pushed or released, respectively.

• To adjust the audio output level, push [Y] or [Z].

e To return to normal operation, push [PA•RX ].

• [16•9] and [DISTRESS] keys are also available.

While in the Public Address mode, the transceiver func­tions (transmit and receive) are interrupted. If the trans­ceiver is in transmit condition, the Public Address function
is not available.

■ RX Speaker function

The IC-M422 has an RX Speaker function. When this func­tion is turned ON, the received audio can be heard on the
deck or tower via an external speaker or hailer.

Connect an external speaker or hailer as described on p. 35.

q Push [PA•

•“ ” appears

• To adjust the audio output level, push [Y] or [Z] while pushing

[PA•RX

w To return to normal operation, push [PA•

RX ] for 1 sec. to enter the RX Speaker mode.

]

.

RX ] for 1 sec.

7

31

8

Scan timer OFF (default) Scan timer ON

Normal scan (default) Priority scan

: Push

• Scan type
“ ”

• DSC watch
“ ”

• Dual/Tri-watch
“ ”

• Weather alert
“ ”

• Scan resume timer
“ ”

• Beep tone
“ ”

• Radio PWR*
“ ”

• Auto ACK
“ ”

• Contrast
“ ”

• Backlight
“ ”

Starting item

SET MODE

■ Set mode programming

Set mode is used to change the conditions of the trans­ceiver’s functions: Scan type, Scan resume timer, Weather
alert, Dual/Tri-watch, DSC watch, Beep tone, LCD backlight,
LCD contrast, Auto acknowledgement and Radio power.*

Available functions may differ depending on dealer setting.

q Turn power OFF.
w While pushing [16•

• “” appears at the channel comment indicator.

e After the display appears, release [16•9].
r Push [16•
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

32

*Available only when optional HM-157 is connected.

] to select the desired item, if necessary.

9

9], turn power ON to enter Set mode.

■ Set mode items

D Scan type

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 se­quence while monitoring Channel 16.

DD

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 re­ceived on any other channel than Channel 16.

SET MODE

Beep tone ON (default) Beep tone OFF

DSC watch OFF (default) DSC watch ON

Scrolls

Dualwatch (default) Tri-watch

Weather alert OFF (default)

Weather alert ON

Appears

Appears

8

DD

Weather alert

A NOAA broadcast station transmits a weather alert tone be­fore 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 during standby or while scanning.

•“WX ALT” appears instead of “WX” indication when the function is
set ON.

DD

Dual/Tri-watch

This item can be selected as Dualwatch or Tri-watch. (p. 12)

DD

DSC watch

DSC watch monitors Channel 70 while you are receiving an­other channel.
If a distress signal is received on Channel 70, the transceiver
monitors Channel 16 and 70 alternately until the distress sig­nal disappears. If a signal is received on another channel,
DSC watch pauses until the signal disappears.

This function may not be available for some channel
groups depending on dealer setting.

•

“” scrolls at the channel comment indicator.

DD

Beep tone

You can select the 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.

8

33

8 SET MODE

Radio PWR ON (default) Radio PWR OFF

Scrolls

Auto acknowledgement

OFF (default)

Auto acknowledgement

ON

Scrolls

LCD contrast level 3 (default)

Scrolls

LCD backlight level 7 (default) LCD backlight OFF

Scrolls

DD

LCD backlight

The LCD backlight brightness can be adjusted from OFF, 1
(dark) to 7 (bright.)
LCD backlight is also adjustable via [SCAN
(p. 9)

➥ While pushing [SCAN

•

“” scrolls at the channel comment indicator.

DD

LCD contrast

The LCD contrast can be adjustable in 4 levels. 1 is the low­est contrast, and 4 is the highest contrast.

•

“” scrolls at the channel comment indicator.

•TAG ],

•TAG ] key.

DD

Automatic acknowledgement

This item sets the automatic acknowledgement function ON
or OFF. When Position Request, Position Report or Polling
Request call is received, transceiver automatically transmits
the reply call, respectively.

•

“” scrolls at the channel comment indicator.

DD

Radio power

(Available only when optional HM-157 is connected.)

This item sets the Radio Power function ON or OFF.

•

“” scrolls at the channel comment indicator.

ON : The transceiver’s power is controlled by the HM-157.

When the HM-157 is turned OFF, the transceiver will
also be turned OFF automatically.

OFF : The transceiver’s power is not controlled by the HM-

157. Even if the HM-157 is turned OFF, the transceiver
will continue to work.

34

■ Connections

Rubber vulcanizing
tape

u

q

y

w
e
r
t

CONNECTIONS AND MAINTENANCE

t NMEA OUT LEAD (White)

Connects to a PC or navigation equipment (NMEA0183
ver. 3.01 sentence formatters DSC, DSE compatible) for
plotting position data received from other ships.

y ANTENNA CONNECTOR

Connects a marine VHF antenna with a PL-259 connector
to the transceiver.

CAUTION: Transmitting without an antenna may dam­age the transceiver.

u EXTERNAL MICROPHONE JACK

Connects to optional HM-157

COMMANDMIC II

™.

9

8
9

q DC POWER CONNECTOR

Connects the supplied DC power cable from this connector
to an external 12 V battery.

w EXTERNAL SPEAKER LEAD (Yellow)

Connects to an external speaker or hailer speaker.

e PUBLIC ADDRESS LEAD (Blue)

Connects to an external speaker or hailer speaker.

• PA output power: 4.5 W (typical) at 10% distortion

with a 4 Ω load

r NMEA IN LEAD (Red)

Connects to a GPS receiver for position indication.

• 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.

CAUTION: After connecting the DC power cable, NMEA
IN/OUT leads, external speaker lead and public address
lead, cover the connector and leads with an adhesive tape
as shown below, to prevent water seeping into the trans­ceiver.

35

9 CONNECTIONS AND MAINTENANCE

Spring washer

Flat washer

Screw
(5 × 20 mm)

EXAMPLE

Knob bolt

Fuse rating: 10 A

Mounting bracket For mounting bracket

DC power cable
(OPC-891)

Microphone hanger
and screws (3×16)

Knob bolts

Screws (5×20)

Flat washers (M5)

Spring washers (M5)

Warning sticker

■ Supplied accessories

■ Antenna

A key element in the performance of any communication sys­tem is the antenna. Ask your dealer about antennas and the
best place to mount them.

■ Fuse replacement

One fuse is installed in the supplied DC power cable. If a fuse
blows or the transceiver stops functioning, track down the

36

source of the problem, if possible, and replace the damaged
fuse with a new one of the proper rating.

■ Mounting the transceiver

DD

Using the supplied mounting bracket

The universal mounting bracket supplied with your transceiver
allows overhead or dashboard mounting.

• Mount the transceiver securely with the 2 supplied screws

(5 × 20) to a surface which is more than 10 mm thick and

can support more than 5 kg.

• Mount the transceiver so that the face of the transceiver is at
90° to your line of sight when operating it.

CAUTION: KEEP the transceiver and microphone at least
1 meter away from your vessel’s magnetic navigation com­pass.

NOTE: Check the installation angle; the function display
may not be easy-to-read at some angles.

■ Optional MB-69 installation

t

r

CONNECTIONS AND MAINTENANCE

9

An optional MB-69
transceiver to a flat surface such as an instrument panel.

CAUTION: KEEP the transceiver and microphone at least
1 meter away from your vessel’s magnetic navigation com­pass.

q Using the template on p. 55, carefully cut a hole into the

instrument panel (or wherever you plan to mount the trans­ceiver.)

w Slide the transceiver through the hole as shown below.

FLUSH MOUNT

is available for mounting the

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.

9

r Tighten the end bolts on the clamps (rotate clockwise) so

that the clamps press firmly against the inside of the in­strument 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.

37

10

PROBLEM POSSIBLE CAUSE SOLUTION REF.

The transceiver does
not turn ON.

No sound from speaker. • Squelch level is too high.

Sensitivity is low. • The Attenuator is activated. • Push [LO/DX•IC] to turn the function OFF. p. 7

Transmitting is impossi­ble, or high power can
not be selected.

Scan does not start. • TAG channel is not programmed. • Set the desired channels as TAG channels. p. 11

No beeps. • Beep tones are turned OFF.

Distress call cannot be
transmitted.

TROUBLESHOOTING

• Bad connection to the power supply.

• Volume level is too low.

• Speaker has been exposed to water.

• Some channels are for low power or re-

ceive only.

• The output power is set to low.

• The squelch is open.

• MMSI (DSC self ID) code is not pro-

grammed.

p. 35• Check the connection to the transceiver.

• Set [SQL] to the threshold point.

• Set [VOL] to a suitable level.

• Drain water from the speaker.

• Change channels.

• Push [HI/LO] on the microphone to select

high power.

• Turn the beep tone ON in Set mode.

• Set [SQL] to the threshold point.

• Program the MMSI (DSC self ID) code. p. 13

p. 7
p. 7

pgs. 5,
6, 54
p. 7

p. 33
p. 7

—

38

■ Specifications

Unit: mm (inch)

139.3 (5

15

⁄32)

78 (3

1

⁄16)

28.9

(1

1

⁄8)

164 (6 15⁄32)

148 (5

13

⁄16)

60.6 (2

3

⁄8)

125.4 (4 15⁄16)

SPECIFICATIONS AND OPTIONS

11

DD

General

• Frequency coverage : Tx 156.025–157.425 MHz

• Mode :

• Channel spacing : 25 kHz

• Current drain (at 13.8 V) : TX high 5.5 A max.

• Power supply requirement : 13.8 V DC

• Frequency stability : ±10 ppm

• Dimensions : 164(W) × 78(H) × 139.3(D) mm

(Projections not included) 6 15⁄32

• Weight : Approx. 1070 g; 2.4 lb

DD

Transmitter

• Output power : 25 W/1 W

• Modulation system : Variable reactance frequency

• Max. frequency deviation : ±5.0 kHz

• Spurious emissions : Less than –70 dBc

DD

Receiver

• Receive system : Double conversion

• Sensitivity (12 dB SINAD) : 0.22 µV (typical)

• Squelch sensitivity : 0.22 µV

• Intermodulation rejection ratio : More than 70 dB

•

Spurious response rejection ratio

• Adjacent channel selectivity : More than 70 dB

• Audio output power : 4.5 W (typical) at 10% distortion

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

Rx 156.050–163.275 MHz
FM (16K0G3E), DSC (16K0G2B)

Max. audio 1.5 A max.

(–20°C to +60°C; –4°F to +140°F)

1

(W) × 3

modulation

superheterodyne

: More than 70 dB

with a 4 Ω load

⁄16

(H) × 5

15

(D) in

⁄32

DD

Dimensions

■ Options

• MB-69

For mounting the transceiver to a panel.

• HM-157

External microphone-type controller. Provides optional inter­com operation. 6 m (20 feet) microphone cable and mount­ing base included. Black and white colors are available.

• OPC-999

6 m (20 feet) microphone extension cable for optional HM­157
(18 m; 60 feet maximum)

FLUSH MOUNT KIT

COMMANDMIC II

MICROPHONE EXTENSION CABLE

COMMANDMIC II

™

™. Up to 2 OPC-999 can be connected.

10
11

39

12

Top keys (p. 42)

u

t

y

w
e
r

q

Speaker

COMMANDMIC II™ HM-157

■ Panel description

The optional HM-157 remotely controls the IC-M422 and pro­vides an optional Intercom function.

DD

Front and side keys

q VOLUME/DIMMER/PA/RX SPEAKER KEY

DIM

[VOL•
➥ Push [YY] or [ZZ] to adjust the audio level after pushing

[VOL•

➥ Push [YY] or [ZZ] to adjust the brightness of the LCD and

key backlight after pushing [VOL•
1 sec. (p. 47)

➥ Move the cursor backward while in the channel com-

ment programming condition. (p. 51)

➥ While pushing [H/L], push to turn the Public Address

mode ON or OFF. (p. 50)

➥ While pushing [H/L], push for 1 sec. to turn the RX

Speaker mode ON or OFF. (p. 50)

w SQUELCH/MONITOR/LOCK KEY [SQL•

➥ Push [YY] or [ZZ] to set the squelch threshold level after

pushing [SQL•

➥ Push for 1 sec. to turn the monitor function ON. (p. 47)
➥ While pushing [H/L], push [SQL•

(microphone) Key Lock function ON or OFF. (p. 46)

•“ T ” appears while (microphone) Key Lock function is in use.

• [PWR], [PTT], [VOL], [SQL] and [H/L] still function when the

➥ Advance the cursor while in channel comment pro-

gramming condition. (p. 51)

PA/RX ]

DIM

PA/RX ] (p. 45)

DIM

MONI

MONI

L]. (p. 45)

MONI

L] to toggle the

(microphone) Key Lock function is turned ON.

PA/RX ] for

L]

40

COMMANDMIC II™ HM-157

12

e ATTENUATOR/INTERCOM/SCRAMBLER KEY

[LO/DX•

IC

SCR]

➥ Push to toggle the Attenuator function ON or OFF.

(p. 45)

•“LOCAL” appears when the Attenuator function is turned ON.

➥ Push for 1 sec. to activate the Intercom function. (p. 50)
➥ Calls the IC-M422 when pushed and held while in Inter-

com mode. (p. 50)
NOTE: Voice scrambler is not available for the IC­M422.

r CHANNEL/DUALWATCH/TRI-WATCH KEY

[CH/WX•

DW

U/I/C]

➥ Push to select and toggle the regular channels and

weather channels. (p. 44)

➥ While pushing [H/L], push to select one of three chan-

nel groups in sequence. (p. 44)

• U.S.A., International and Canadian channels are available.

➥ Push for 1 sec. to start Dualwatch or Tri-watch.

(p. 47)

➥ Push to stop Dualwatch or Tri-watch when either is acti-

vated. (p. 47)

t CHANNEL 16/CALL CHANNEL KEY [16•

9]

➥ Push to select Channel 16. (p. 44)
➥ Push for 1 sec. to select call channel. (p. 44)

•“CALL” appears when call channel is selected.

➥ Push for 3 sec. to enter call channel programming con-

dition when call channel is selected. (p. 46)

DW

➥ While pushing [CH/WX•

U/I/C], push to enter the

channel comment programming condition. (p. 51)

➥ While turning power ON, push to enter Set mode.

(p. 49)

y CHANNEL UP/DOWN KEYS [YY]/[ZZ]

➥ Push to select the operating channel, Set mode set-

tings, etc. (pgs. 44, 49)

➥ Push and hold [Y] to move upward through the operat-

ing channels continuously.

➥ Push and hold [Z] to move downward through the op-

erating channels continuously.

➥

Push [YY] or [ZZ] to adjust audio level or noise squelch
level after pushing [VOL•

PA/RX ] or [SQL• L],

respectively. (p. 45)

➥ Push [YY] or [ZZ] to adjust the brightness of the LCD and

key backlight after pushing [VOL•

DIM

PA/RX ] for 1

sec. (p. 47)

➥ Checks TAG channels or changes scanning direction

during scan. (p. 48)

➥ Push [Y] or [Z] to adjust the audio level during in Pub-

lic Address mode. (p. 50)

➥ While pushing [VOL•

DIM

PA/ RX ], push [Y] or [Z] to

adjust the audio level during in RX Speaker mode. (p. 50)

u PTT SWITCH [PTT] (p. 45)

Push and hold to transmit; release to receive.

MONIDIM

12

41

qtrew

y
u

i

o

!0

!2

!4

!3

!1

PWR

SCAN

H/L

TAG

q

w e

42

12 COMMANDMIC II™ HM-157

DD

Top keys

q POWER KEY [PWR] (p. 45)

Push for 2 sec. to turn the HM-157 power ON or OFF
when the IC-M422 power is turned ON.

w SCAN KEY [SCAN• ] (p. 48)

➥ Push to start and stop Normal or Priority scan when

TAG channels are programmed.

➥ Push for 1 sec. to set the displayed channel as a TAG

(scanned) channel.

➥ While pushing [H/L], push for 3 sec. to clear or set all

TAG channels.

e TRANSMIT POWER KEY [H/L]

➥ Push to toggle high or low power. (p. 45)

• Some Channels are set to low power only.

➥ While pushing this key, other keys perform secondary

functions.

➥ While turning power ON, push to toggle the All key Lock

function ON or OFF. (p. 46)

•“ T ” blinks while the All key Lock function is in use.

• Only [PWR] and [PTT] are functional when the All key Lock

function is in use.

TAG

■ Function display

q TRANSMIT INDICATOR (p. 45)

Appears while transmitting.

w BUSY INDICATOR (p. 45)

Appears when receiving a signal or when the squelch
opens.

e TAG CHANNEL INDICATOR (p. 48)

Appears when a TAG channel is selected.

r CALL CHANNEL INDICATOR (p. 46)

Appears when call channel is selected.

t LOW POWER INDICATOR (p. 45)

Appears when low power is selected.

COMMANDMIC II™ HM-157

12

y WEATHER CHANNEL INDICATOR (pgs. 33, 44)

➥ “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.

u DUPLEX INDICATOR (p. 44)

Appears when a duplex channel is selected.

i LOCAL INDICATOR (p. 45)

Appears when the Attenuator function is turned ON.

o CHANNEL COMMENT INDICATOR

➥ Channel comment appears (and scrolls) if programmed.

(p. 51)

➥ “” or “” blinks during Dualwatch or Tri-watch, re-

spectively. (p. 47)

➥ “” or “” appears during Priority or Normal

scan, respectively. (p. 48)

➥ In Set mode, indicates and scrolls the selected item.

(p. 49)

!0 SQUELCH INDICATOR (p. 45)

Appears while noise squelch level is adjusted.

!1 VOLUME INDICATOR (p. 45)

Appears while audio output level is adjusted.

!2 CHANNEL NUMBER READOUT

➥ Indicates the selected operating channel number.

• “” appears when a simplex channel is selected. (p. 44)

➥ In Set mode, indicates the selected condition. (p. 49)

!3 KEY LOCK INDICATOR (p. 46)

➥ Appears while the Key Lock function is in use.
➥ Blinks while the All Key Lock function is in use.

!4 CHANNEL GROUP INDICATOR (p. 44)

Indicates whether an U.S.A. “USA,” International “INT” or
Canadian “CAN” channel is selected.

12

43

12 COMMANDMIC II™ HM-157

U.S.A. channels

Canadian channelsInternational channels

While pushing ,

push .

Push

Push for 1 sec.

Push

■ Channel selection

DD

Channel 16

q Push [16•9] to select Channel

16.

w Push [CH/WX] to return to the

condition before selecting Chan­nel 16, or push [YY] or [ZZ] to se­lect an operating channel.

DD

Call channel

q Push [16•9

call channel.

w Push [CH/WX] to return to the

condition before selecting call
channel, or push [YY] or [ZZ] to
select an operating channel.

DD

Weather channels

q Push [CH/WX] once or twice to

select the weather channel group.

w Push [YY] or [ZZ] to select a

weather channel.

e Push [CH/WX] to return to the

condition before selecting the
weather channel group.

] for 1 sec. to select

DD

U.S.A., International and Canadian channels

q Push [CH/WX• U/I/C] to select a regular channel.

• Push [CH/WX• U/I/C] again, if a weather channel appears.

w While pushing [H/L], push [CH/WX• U/I/C] to select a

channel group.

• U.S.A., International and Canadian channels can be selected in
sequence.

e Push [Y] or [Z] to select a channel.

•“DUP” appears for duplex channels.

•“ ” appears when a simplex channel is selected.

DW

DW

DW

44

■ Receiving and transmitting

w Set volume

w Set squelch

t Turn attenuator

function

y Set output power

e Select channel

group

e Select channel
group

q Turn power ON

w Set volume

and squelch

r Set channel

u Push to

transmit

i Release

to receive

Microphone

COMMANDMIC II™ HM-157

12

q Push [PWR] for 2 sec. to turn power ON.
w Set the audio and squelch levels.

➥ Push [SQL•

➥ Push [VOL•

➥ Push [SQL•

e To change the channel group, push [CH/WX•

while pushing [H/L]. (p. 44)

r Push [Y] or [Z] to select the desired channel. (p. 44)

• When receiving a signal, “” appears and audio is emitted
from the speaker.

• Further adjustment of the audio level may be necessary.

t Push [LO/DX• SCR

function ON or OFF, if necessary.

•“LOCAL” appears when the receive Attenuator function is in use.

y Push [H/L] 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.

u Push and hold [PTT] to transmit, then speak into the mi-

crophone.

•“ ” appears.

• Channel 70 cannot be used for transmission other than DSC.

i Release [PTT] to receive.

MONI

L], then push [

pears.

DIM

PA/RX ], then push [

just the audio output level.

MONI

L], then push [

appears.

IC

] to turn the receive Attenuator

YY

ZZ

] until the noise ap-

YY

] or [ZZ] to ad-

] until the noise dis-

DW

U/I/C]

Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN­NOT be lawfully used by the general public in U.S.A. wa-

ters.

IMPORTANT: To maximize the readability of your trans­mitted signal (voice), pause a few sec. after pushing [PTT],
hold the microphone 2 to 4 inches (5 to 10 cm) from your
mouth and speak at a normal voice level.

12

45

12 COMMANDMIC II™ HM-157

Appears

Blinks

■ Call channel programming

q While pushing [H/L], push

[CH/WX•

to select the desired channel
group (USA, INT, CAN) to be pro­grammed.

w Push [16•

channel of the selected channel
group.

•“CALL” and call channel number ap-
pear.

e Push [16•9] again for 3 sec. (until

a long beep changes to 2 short
beeps) to enter the call channel
programming condition.

• The channel number and channel
group to be programmed blinks.

r Push [YY] or [ZZ] to select the de-

sired channel.

t Push [16•

played channel as the call chan­nel.

• The channel number stops blinking.

• Push [CH/WX• U/I/C] to cancel.

DW

U/I/C] several times

9] for 1 sec. to select call

9] to program the dis-

DW

■ Lock functions

The Lock function electronically locks keys and switches to
prevent accidental changes and function access from the mi­crophone.

• All keys, switches and controllers on the transceiver are functional.

DD

Activating the Lock function

➥ While pushing [H/L], push

[SQL•

function ON or OFF.

•“ T ” appears.

• Only [PWR], [PTT], [H/L],

DD

➥ While pushing [H/L], turn the

power ON by pushing [PWR] to
turn the All Key Lock function ON
or OFF.

•“ T ” blinks.

• Only [PWR] and [PTT] are func-

MONI

L] to turn the Lock

MONI

[SQL• L

+[YY] or [ZZ] and [SQL•
or [ZZ] are functional.

], [VOL•

DIM

MONI

PA/RX

L]+[

]

YY

]

Activating the All Key Lock function

tional.

46

COMMANDMIC II™ HM-157

Blinks when the dualwatch
function is in use.

Appears

Blinks

12

■ Display backlight

The function display and keys can be backlit for better visibil­ity under low light conditions. The backlighting condition can
also be adjusted independently from the transceiver.

q Push [VOL•

1 sec. to enter the backlight
adjusting mode.

•“ ” with the number of the
backlight level appears in the
channel comment indicator.

w Push [YY] or [ZZ] to adjust the

backlight level.

• The backlight is adjustable in 7
levels and OFF.

DIM

PA/RX ] for

■ Monitor function

The monitor function releases the noise squelch mute of the
microphone only. (An independent noise squelch system is
employed.)

➥ Push [SQL•

to activate the Monitor function.

•“ ” blinks and audio is
emitted.

• Any key cancels the Monitor
function.

MONI

L] for 1 sec.

■ Dualwatch/Tri-watch
operation

q Select Dualwatch or Tri-watch in Set mode. (P. 33)
w Push [YY] or [ZZ] to select the desired channel.

• While pushing [H/L], push [CH/WX• U/I/C] several times to
select the channel group (USA, INT, CAN), if desired.

e Push [CH/WX• U/I/C] for

1 sec. to start Dualwatch or
Tri-watch.

•“ ” or “” blinks at the chan-
nel comment indicator during
Dualwatch or Tri-watch, respec­tively.

• A beep tone sounds when a sig­nal is received on Channel 16.

• Tri-watch becomes Dualwatch
when receiving a signal on the
call channel.

r To cancel Dualwatch or Tri-watch, push [CH/WX• U/I/C

again.

DW

DW

DW

12

]

47

12 COMMANDMIC II™ HM-157

During normal scan.

■ Setting TAG channels

q While pushing [H/L], push [CH/WX• U/I/C] several

times to select the desired channel group (USA, INT or
CAN).

w Push [YY] or [ZZ] to select the desired channel to be set as

a TAG channel.

e Push [SCAN• ]for 1 sec. to set the displayed channel

TAG

as a TAG channel.

•“ ” appears in the display.

r To cancel the TAG channel setting, repeat step e.

•“ ” disappears.

✔ Clearing (or setting) all tagged channels

While pushing [H/L], push [SCAN• ]for 3 sec. (until a long

TAG

beep changes to 2 short beeps) to clear all TAG channels in
the channel group.

• Repeat above procedure to set all TAG channels.

DW

■ Starting a scan

Set scan type (Priority or Normal scan) and scan resume
timer in advance, using Set mode. (p. 32)

q While pushing [H/L], push [CH/WX•

times to select the desired channel group (USA, INT or
CAN).

w Set TAG channels as described at left.
e Make sure the squelch is closed to start a scan.
r Push [SCAN• ]to start

TAG

Priority or Normal scan.

•“ ”or “” appears at
the channel comment indicator
during Priority or Normal scan,
respectively.

• When a signal is detected, scan
pauses until the signal disap­pears or resumes after pausing
5 sec. according to the Set mode setting (Channel 16 is still
monitored during Priority scan).

• Push [YY] or [ZZ] to check the scanning TAG channels, to change
the scanning direction or resume the scan manually.

•“ ” blinks at the channel comment indicator and a beep tone
sounds when a signal is received on Channel 16 during Priority
scan.

t To stop the scan, repeat step r.

DW

U/I/C] several

48

■ Set mode programming

Scrolls

Scrolls

COMMANDMIC II™ HM-157

12

Set mode is used to change the condition of the transceiver’s
functions and the microphone’s own functions:

Transceiver’s functions—
Scan type, Scan resume timer, Weather alert, Dual/Tri-watch,
Beep tone*
PWR.
Microphone’s own functions—
Beep tone*

*1For transceiver setting
*2For microphone setting

In this section, instructions are for the microphone’s own func­tions only. Refer to pgs. 32 to 34 for the setting of the other
functions. (Some functions cannot be selected from the
HM-157.)

DD

Entering Set mode

q Turn power OFF.
w While pushing [16•

• After a beep emission, a Set mode item appears at the channel
comment indicator.

e After the display appears, release [16•9].
r Push [16•
t Push [YY] or [ZZ] to select the desired condition of the item.
y Turn power OFF, then ON again to exit Set mode.

1

, LCD backlight*1, LCD contrast*1and Radio

2

, LCD backlight*2and LCD contrast*

], turn power ON.

9

] to select the desired item, if necessary.

9

2

• Beep tone

You can select the 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.

• LCD backlight

The LCD backlight brightness can
be adjusted from OFF, 1 (dark) to
7 (bright.)

•

“” scrolls at the channel

comment indicator.

• LCD contrast

The LCD contrast can be ad­justable in 4 levels. 1 is the lowest
contrast, and 4 is the highest con­trast.

•

“” scrolls at the channel

comment indicator.

12

49

12 COMMANDMIC II™ HM-157

■ Intercom operation

q

Push [LO/DX• SCR] for 1 sec.
to activate the Intercom function.

w Push and hold [PTT] to talk.

•“ ” appears at the channel
comment indicator.

e Release [PTT] to listen.

•“ ” appears at the channel
comment indicator when the trans­ceiver is in talking mode.

r Push [LO/DX• SCR] to cancel the Intercom function.

• Pushing [16•9] also cancels the Intercom function.

For your reference:

In case the Intercom mode is selected with the transceiver
while the microphone power is OFF, the microphone power is
automatically turned ON and the Intercom mode is selected.

DD

Intercom beep function

➥ Push and hold [LO/DX• SCR] for more than 1 sec.

• Emits the Intercom beep while holding.

IC

IC

IC

■ Public Address function

q While pushing [H/L], push

DIM

[VOL•

PA/RX ] to enter the

Public Address mode.

w Push and hold [PTT] to talk.

•“ ” appears at the channel
comment indicator.

e Release [PTT] to listen.

•“ ” appears at the channel
comment indicator when the transceiver is in talking mode.

• To adjust the audio output level, push [Y] or [Z].

r To cancel the Public Address mode, repeat step q.

• Pushing [16•9

] also cancels the Intercom function.

While in the Public Address mode, the transceiver func­tions (transmit and receive) are interrupted. If the trans­ceiver is in transmit condition, the Public Address function
is not available.

■ RX Speaker function

q Push [VOL• PA/RX ] for 1 sec. to enter the RX

Speaker mode.

•“ ” scrolls at the channel comment indicator.

• To adjust the audio output level, push [Y] or [Z] while pushing

[VOL• PA /RX ].

w To cancel the RX Speaker mode, repeat step q.

•“ ” scrolls at the channel comment indicator.

DIM

DIM

50

COMMANDMIC II™ HM-157

q

we

r

12

■ Channel comments

q Push [YY] or [ZZ] to select a channel to program a channel

comment.

• While pushing [H/L], push [CH/WX• U/I/C] several times to
select the channel group (USA, INT, CAN), if desired.

w While pushing [CH/WX• U/I/C], push [16•9].

DW

• A cursor and the first character start blinking alternately.

e Select the desired character by pushing [Y] or [Z].

• Push [SQL] or [VOL• PA/RX ] to move the cursor forward
or backward, respectively.

DIM

r Repeat step e to input all characters.
t Push [16•

• Push [CH/WX• U/I/C

• The cursor and the character stop blinking.

9] to input and set the comment.

DW

] to cancel.

y Repeat steps q to t to program other channel com-

ments, if desired.

• Available characters

(+)

(✱)

(=)

(4)

(5)

(6)

(7)

(E)

(F)

(Z)

(P)

(G)

(Q)

(a)

(j)

(k)

(D)

(N)

(O)

(X)

(Y)

(i)

(h)

(r)

(s) (t) (u) (v) (w) (x) (y) (z)

(H)

(8)

(R)

(b)

(/)

(.)( )

(9)

(I)

(S)

(c)

(l)

(m)

DW

(B)

(V)

(3)

(2)

(C)

(M)

(W)

(f)

(g)

(q)

(p)

(0)

(1)

(space)

(A)

(J) (K) (L)

(T)

(U)

(d)

(e)

(n)

(o)

■ HM-157 supplied accessories

Accessories included with the HM-157: Qty.

q Connection cable (OPC-1000: 6 m; 20 ft) ...................... 1

w Mounting base ................................................................ 1

e Microphone hanger ........................................................ 1

r Screws (M3 × 16; tapping) ............................................. 5

12

51

12 COMMANDMIC II™ HM-157

Gasket

Cap

Mounting base

Nut

Screw holes
(approx. 2 (d) mm;

3

32″)

■ Installation

The optional HM-157 can be connected to the transceiver di­rectly, as well as via the supplied connection cable for longer
distance remote operation. The connector of the connection
cable can be installed into a cabinet, wall, etc., as a built-in
plug.

For longer distance remote operation, the optional extension
cable, OPC-999 (6 m; 20 ft/connecting between transceiver
and the connection cable), is available, and up to 2 OPC-999
can be added.

q Insert the supplied cable into the external microphone jack

and tighten the cable nut as shown below.

w To use the supplied cable as a wall socket, follow the

below steps.

e Using the mounting base, carefully mark off the 2 spots

where the cable and screws will be fastened.

r Drill holes at these marks.
t Install the mounting base using the supplied screws as

shown below.

y The completed installation should look like this.

52

COMMANDMIC II™ HM-157

50 (d) mm; 1

31

⁄32˝

23 (d) mm;

29

⁄32˝

24 to 27 (d) mm

(

15

⁄16 to 1

1

⁄16˝)

5 mm; 3⁄16˝

Gasket

Mounting base

Cap

Nut

2 mm; 3⁄32˝

12

12

53

13

Channel number

USA CAN

Transmit

Receive

01 156.050 160.650

01A 156.050 156.050

02 156.100 160.700

03 156.150 160.750

03A 156.150 156.150

156.200 160.800

04A 156.200 156.200

156.250 160.850

05A 05A 156.250 156.250

06 06 156.300 156.300

156.350 160.950

07A 07A 156.350 156.350

08 08 156.400 156.400

09 09 156.450 156.450

10 10 156.500 156.500

11 11 156.550 156.550

12 12 156.600 156.600

13

*2

13

*1

156.650 156.650

14 14 156.700 156.700

15

*2

15

*1

156.750 156.750

16 16 156.800 156.800

17

*1

17

*1

156.850 156.850

156.900 161.500

18A 18A 156.900 156.900

Frequency (MHz)

INT

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

*1

16

17

18

Channel number Frequency (MHz)

USA CAN

Transmit

Receive

19A 19A 156.950 156.950

20

20

*1

157.000 161.600

21 157.050 161.650

21A 21A 157.050 157.050

157.100 161.700

22A 22A 157.100 157.100

23 157.150 161.750

23A 157.150 157.150

24 24 157.200 161.800

25 25 157.250 161.850

26 26 157.300 161.900

27 27 157.350 161.950

28 28 157.400 162.000

60 156.025 160.625

156.075 160.675

61A 61A 156.075 156.075

156.125 160.725

62A 156.125 156.125

156.175 160.775

63A 156.175 156.175

64 156.225 160.825

INT

20

21

22

23

24

25

26

27

28

60

61

62

63

64

20A 157.000 157.000

Channel number

66A

Frequency (MHz)

66A

*1

USA CAN

Transmit

Receive

64A 64A 156.225 156.225

65A 65A 156.275 156.275

156.325 160.925

67

*2

67 156.375 156.375

68 68 156.425 156.425

69 69 156.475 156.475

70

*3

70

*3

156.525 156.525

71 71 156.575 156.575

72 72 156.625 156.625

73 73 156.675 156.675

74 74 156.725 156.725

77

*1

77

*1

156.875 156.875

156.925 161.525

78A 78A 156.925 156.925

156.975 161.575

79A 79A 156.975 156.975

157.025 161.625

80A 80A 157.025 157.025

157.075 161.675

81A 81A 157.075 157.075

157.125 161.725

82A 82A 157.125 157.125

INT

65A

66

67

68

69

70

*3

71

72

73

74

77

78

79

80

81

82

156.325 156.32566A

Channel number

84A

Frequency (MHz)

USA CAN

Transmit

Receive

83A 83A 157.175 157.175

84 84 157.225 161.825

85 85 157.275 161.875

85A 157.275 157.275

86 86 157.325 161.925

86A 157.325 157.325

87 87 157.375 161.975

87A 157.375 157.375

88 88 157.425 162.025

88A 157.425 157.425

INT

84

85

86

87

88

157.225 157.225

WX channel

4

Frequency (MHz)

Transmit Receive

1 RX only 162.550

2 RX only 162.400

3 RX only 162.475

5 RX only 162.450

6 RX only 162.500

7 RX only 162.525

8 RX only 161.650

9 RX only 161.775

10 RX only 163.275

RX only 162.425

*1

Low power only.

*3

DSC operation only

156.950 161.55019

21b Rx only 161.650

25b Rx only 161.850

156.275 160.87565

28b Rx only 162.000

83 157.175 161.77583

83b Rx only 161.775

*2

Momentary high power.

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.

CHANNEL LIST

54

Unit: mm (inch)

164 (6

15

⁄32)

78 (3

1

⁄16)

149 (5

7

⁄8)

61.6 (2

7

⁄16)

R8 (Max.)

HM-157

MB-69

24 to 27 (d)
(

15

⁄16 to 11⁄16)

2 (

3

⁄32)

TEMPLATE

14

Cut here

13
14

55

MEMO

57

A-6431D-1US
Printed in Japan

© 2005 Icom Inc.

1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan