Uniden UM425 VHF DSC User Manual To The 6523143c Ef72 4c42 Abec C779dc6b90dd

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UM425 VHF DSC

Marine Radio

UM425 VHF OM.indd 1 28/9/11 11:55:11 AM

Making a distress call

Lift the red cover. Press and hold the DISTRESS

button for three seconds. The UM425 transmits your

boat’s location every few minutes until you receive a

response.

NOTE: If the radio displays ENTER USER MMSI,

cancel the automatic distress call and make a

normal voice distress call.

Lift the red cover

and press the

DISTRESS button.

Making a voice distress call

Speak slowly -- clearly -- calmly.

Make sure your radio is on. 1.

On the microphone, press the 2. 16/9-TRI button to switch to Channel 16 (156.8

MHz). (If the corner of the display does not show 16, press the 16/9-TRI button

again until it does.)

Press the 3. PUSH TO TALK button on the microphone and say:

"MAYDAY --MAYDAY-- MAYDAY."

Say "4. THIS IS {name or call sign of your boat}."

Say "5. MAYDAY {name or call sign of your boat}."

Tell where you are: (what navigational aids or landmarks are near, or read the 6.

latitude and longitude from your GPS).

State the nature of your distress, e.g. are you sinking, medical emergency, man 7.

overboard, on re, adrift, etc.

Give number of persons aboard and conditions of any injured persons. 8.

Estimate present seaworthiness of your ship, e.g. how immediate is the danger 9.

due to ooding or re or proximity to shore.

Briey describe your ship (length, type, color, hull). 10.

Say: "11. I WILL BE LISTENING ON CHANNEL 16."

End message by saying "12. THIS IS {name or call sign of your boat}, OVER."

Release the 13. PUSH TO TALK button and listen.

If you do not get an answer after 30 seconds, repeat your call, beginning at

step 3, above.

Making a DSC DISTRESS Call

For future reference, write your boat’s name & call sign here:

NOTE: There is no ofcial VHF DSC shore infrastructure in Australia. Vessels

tting VHF DSC equipment should realise that this equipment can only be used

for vessel - to - vessel alerting in the Australian region. There is no ofcial

shore-based infrastructure but there are a number of volunteer marine rescue

(VMR) stations that have installed VHF DSC and a check with your local VMR

should be made.

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Making a distress call

UM425 VHF OM.indd 3 28/9/11 11:55:11 AM

Table of Contents

Making a DSC DISTRESS Call .......................................................................................2

Making a voice distress call .........................................................................................2

Table of Contents ...................................................................................... 4 (this page)

Introduction .....................................................................................................................6

Features.......................................................................................................................6

Manual overview ..........................................................................................................6

Conventions ..............................................................................................................6

Terms used in this manual ........................................................................................7

Getting Started ................................................................................................................8

What's included ....................................................................................................................... 8

Parts of the radio ..................................................................................................................... 9

Turning on the radio .............................................................................................................. 12

Setting the UIC channel mode (USA/CAN/INT) .................................................................. 12

How It Works .................................................................................................................12

Normal mode operation .............................................................................................13

Using the radio in normal mode ..............................................................................14

Normal mode with Triple and Dual Watch ..............................................................15

Scan mode.................................................................................................................16

Using the radio in scan mode .................................................................................16

Scan mode with Triple and Dual Watch ..................................................................17

Using Your Radio ..........................................................................................................18

Making a voice MAYDAY call .....................................................................................19

Setting the volume .....................................................................................................19

Setting the squelch level ............................................................................................19

Changing the channel ................................................................................................20

Making a transmission ...............................................................................................20

Boosting the transmission power ............................................................................20

Choosing Triple Watch or Dual Watch ....................................................................21

Changing display and sound options .........................................................................22

Contrast ..................................................................................................................22

Lamp adjust ............................................................................................................22

Turning the key beep on and off .............................................................................22

Setting the GPS position manually ............................................................................22

Using Digital Selective Calling (DSC) Features .........................................................24

What is DSC? ............................................................................................................24

Advanced DSC features ............................................................................................24

Getting an MMSI number...........................................................................................25

Entering MMSI numbers ............................................................................................25

Individual or user MMSI number .............................................................................25

Group MMSI number ..............................................................................................26

Using the directory .....................................................................................................27

Making DSC calls ......................................................................................................29

Calling a single station (Individual Call) ..................................................................30

Calling a particular group of stations (Group Call) ..................................................31

Calling all stations (All-Ships Call) ............................................................................... 31

Making an automatic distress call ............................................................................... 32

Canceling an automatic distress call ......................................................................32

Receiving a DSC call .................................................................................................33

Receive log ................................................................................................................33

Returning a call .......................................................................................................34

Making a Test Call (Test) ...........................................................................................35

Receiving a test call ................................................................................................36

Table of Contents

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Table of Contents (Cont'd)

Table 1 - Terms used in this manual ................................................................................7

Table 2 - Rear panel connector functions ........................................................................9

Table 3 - Front panel button functions ............................................................................10

Table 4 - Microphone button functions ........................................................................... 11

Table 5 - Normal mode status messages .......................................................................14

Table 6 - Character and text entry order ........................................................................28

Table 7 - Receive log .....................................................................................................34

Table 8 - Common GPS receivers and connections ......................................................46

Table 9 - Radio specifications ........................................................................................54

Table 10 - International Channel Frequencies and Channel Tag ...................................57

Table 11 - USA Channel Frequencies and Channel Tag ................................................59

Table 12 - Canadian Channel Frequencies and Channel Tag .......................................61

Table 13 - NMEA Input Parameters ...............................................................................63

Enabling automatic test call reply ...........................................................................36

Requesting another station's position (POS Request) ..............................................36

Receiving a position request (Position Reply) ...........................................................37

Enabling automatic position reply ...........................................................................37

Sending your own position (Position Send) ................................................................38

Putting the radio into standby......................................................................................38

Disabling automatic channel switching .......................................................................39

Renaming Channels .....................................................................................................40

Installing the Hardware ................................................................................................41

Mounting the radio .....................................................................................................41

Connecting the radio..................................................................................................43

Connecting accessories.............................................................................................45

Connecting to a GPS receiver ................................................................................45

Configuring the GPS ...............................................................................................47

Connecting to a charplotter ....................................................................................48

Connecting to an external speaker .........................................................................48

Connecting to an external PA speaker ...................................................................49

Using the PA feature ...............................................................................................50

Maintenance and Troubleshooting .............................................................................51

Common questions ...............................................................................................................51

Engine Noise Suppression ................................................................................................... 53

Specifications ...............................................................................................................54

Channel and frequencies ......................................................................................................57

NMEA Operation ................................................................................................................... 63

NMEA Input ........................................................................................................................ 63

NMEA Output ..................................................................................................................... 63

Regulations and Safety Warnings ......................................................................................... 64

Basic radio guidelines ................................................................................................64

DSC: Frequently Asked Questions ............................................................................64

Antenna Selection and Installation ............................................................................65

Two Year Limited Warranty ..........................................................................................66

Mounting Bracket Template .........................................................................................67

List of Tables

UM425 VHF OM.indd 5 28/9/11 11:55:12 AM

Introduction

Features

Watertight Radio Housing: •

Meets the worldwide JIS6 water resistant specication means it is able to

withstand powerful water jets without damage.

Rugged Waterproof Speaker Microphone:•

With Channel Select, One-Touch 16/9 and Triple Watch Select Keys.

Meets the worldwide JIS7 waterproof specications; submersible at 1.0

metre depth for 30 minutes.

Large, dot matrix display•

Advanced DSC Class D functions, including Test Calling•

Built-in PA output•

Channel select buttons on the microphone•

Memory scan mode•

Lets you save channels to memory and monitor them in quick succession.

Transmitter Power Level Select•

Lets you boost the transmitter power from 1 watt to 25 watts for added

transmission distance.

Battery level display and tone•

Sounds an alert tone if the battery voltage goes too high or too low.

Triple Watch Operation•

Checks the emergency channel 16 and channel 9 in the background.

All marine VHF channels for the International, U.S. and Canadian •

waters

Manual overview

Conventions

This manual uses several different type styles to help you distinguish

between different parts of the radio:

• BOLD SMALL CAPITALS indicates an actual button or knob on the radio

or microphone.

• Upper and Lower case bold indicates a connector or label on the

radio.

• Italics indicate text on the display, such as menu options, prompts,

and conrmation messages.

Introduction

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Introduction

DSC Digital Selective Calling. A VHF radio standard for

communicating among boats and sending automated

distress calls.

GPS Global Positioning System

NMEA National Marine Electronics Association. The

organization that governs standards for electronic

equipment used on boats. NMEA 0183 is the standard

for serial data communication used by GPS receivers.

MMSI Maritime Mobile Service Identity number. A unique,

nine-digit number that identies you and your boat

when making DSC calls. It is also used by the Coast

Guard if you send an automated distress call.

Station Any DSC radio, whether it’s operated on a boat, at a

marina, or by a shore station.

Table 1 - Terms used in the manual

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Getting Started

What's included

1 Watt INT

Memory

Scanning Channels

01,03,05,06,07,08

VHF DSC TRANSCEIVER

UM425 VHF

UM425 Radio

DC Power Cable Accessory Cable

Mounting Bracket and

knobs Mounting Hardware

Microphone Hanger and

Mounting Hardware

Spare Fuse 250V 6A

Getting Started

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Getting Started

Parts of the radio

13.8V DC

ANTENNA

Antenna

connector

(SO238)

Heat sink

Power

connector

Accessory

connector

Table 2 - Rear panel connector functions

Connector Connects to For details, see

Antenna connector External VHF antenna with

a male PL259 (SO238)

connector and 50 Ω

impedance.

Minimum 1.2m, 3dB rated

antenna for sailboats, 2.4m, 6

dB rated for power boats.

Connecting the radio,

page 44.

Power connector Nominal 13.8 VDC power

supply with negative ground

(10.8 VDC to 15.6 VDC)

(Red wire +, black wire -).

Connecting the radio,

page 43.

Accessory connector GPS receiver, GPS

chartplotter, external speaker,

external PA speaker.

Connecting accessories,

page 45.

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Getting Started

1 Watt INT

Memory

Scanning Channels

01,03,05,06,07,08

VHF DSC TRANSCEIVER

UM425 VHF

LCD

display

SELECT

button

CHANNEL UP &

DOWN buttons

VOLUME-PWR

(power) knob

(turn clockwise

to increase

volume)

Microphone

cord

16/9-TRI

(triple/

dual-watch)

button

1/25W

button

SCAN-MEM

(channel

memory)

button

MENU-PA

(public

address)

button DISTRESS

button

SQUELCH knob

(turn clockwise

to decrease

channel noise)

Button Press to... Press and hold to...

SELECT Choose an option on a menu.

CHANNEL UP Move up one channel at a time. Move quickly up the

channels.

CHANNEL DOWN Move down one channel at a time. Move quickly down the

channels.

16/9-TRI 1st press: Go to Channel 16.

2nd press: Go to Channel 9.

3rd press: Go back to the original

channel.

Go into Triple Watch or

Dual Watch mode (see

page 15).

DISTRESS Select the nature of your distress

for a distress call.

Transmit a distress call.

Table 3 - Front panel button functions

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Getting Started

Button Press to... Press and hold to...

1/25W Change the transmit power (see

page 20).

MENU-PA Display the radio menu. Use the public address

(PA) function.

SCAN-MEM Start scanning the channels saved

in memory.

Save a channel into

memory or remove a

channel from memory.

16/9

TRI

MIC

PUSH-

TO-TALK

button

16/9 TRI

(Triple/Dual-

Watch) button

▲

(up) button

(move up a channel)

▼

(down) button

(move down a channel)

Table 4 - Microphone button functions

Button Press to... Press and hold to...

▲

Move up one channel at a time. Move quickly up the

channels.

▼

Move down one channel at a time. Move quickly down the

channels.

16/9-TRI 1st press: Go to Channel 16.

2nd press: Go to Channel 9.

3rd press: Go back to the original

channel.

Go into Triple Watch or

Dual Watch mode (see

page 15).

PUSH TO TALK Cancel scanning and stay on a

channel.

Talk on a channel.

UM425 VHF OM.indd 11 28/9/11 11:55:15 AM

How It Works

Turning on the radio

Turn the VOLUME-PWR knob clockwise to turn on the radio. As it powers on,

the radio displays the user MMSI number; if there is no MMSI set, the radio

displays MMSI not entered.

When it powers on, the radio selects the last channel used.

Setting the UIC channel mode (USA/CAN/INT)

NOTE: This menu selection is hidden by default. To access this feature; Turn

on the radio while holding down SCAN and

▲

buttons. The feature will

be hidden again from the menu when power is turned off. The radio comes

preset to use the UIC channels assigned for International waters. If you are

operating in an area that uses Canadian or United States UIC channels, you

will need to change the channel mode.

Press the 1. MENU-PA button to display the menu, and choose the Setup

sub-menu.

Select 2. USA/CAN/INT. The screen displays the UIC channel setup.

Highlight the channel mode you want to use: US (3. USA mode),

Canadian (Canada mode), or international (Intl mode).

Press the 4. SELECT button. The radio activates the new channel mode

and exits the menu.

How It Works

The UM425 has two basic modes of operation:

Operation mode What it does: Use it when: To turn it on/off:

Normal mode Monitors a single

marine radio

channel and lets

you talk on that

channel.

You want to talk to

another station on a

specic channel.

(default mode)

Scan mode Monitors all the

channels you save

into memory.

You have a small

group of channels

you use most often

and want to check

them for trafc.

Press the SCAN-

MEM button.

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How It Works

NOTE: You are required to monitor channel 16 whenever your boat is under-

way. You should have either Triple Watch or Dual Watch on at all times.

In addition to the two main operation modes, the UM425 also provides two differ-

ent “watch” modes which you can activate during any of the two basic modes. In

the watch modes, the radio briey checks for activity on a specic channel, then

returns to its previous mode.

Normal mode operation

Normal mode monitors whatever channel you select, and you can transmit on

that channel also.

While using normal mode, the display lets you see the following information

(not all indicators will display at the same time):

Marine Operator

25 Watts INT

Memory

GPS Data OK

Transmit power

(1 W or 25 W)

Current channel

is stored in

memory

Status messages

(see the status

message table)

Current

channel

number

Current channel

name (if the name

is too long, the

name line scrolls)

Channel mode

(USA, CANadian,

or INTernational)

Watch mode What it does: Use it when: To turn it on/off:

Triple Watch Checks for activity

on channels 16

and 9 every two

seconds.

You want to monitor

a channel yet

maintain a watch on

channels 16 and 9.

Press and hold the

16/9-TRI button for

two seconds.

Dual Watch Checks for activity

on channel 16 every

two seconds.

You want to monitor

a channel yet

maintain a watch on

channel 16.

Change Triple

Watch to Dual

Watch in the setup

menu, then press

and hold the 16/9-

TRI button for two

seconds.

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How It Works

Table 5 - Normal mode status messages

Message Meaning

GPS Data OK The radio is receiving valid GPS data.

Check GPS The radio is not receiving valid GPS data: check the GPS status screen and

the GPS connection.

Input Position The radio has been unable to receive valid GPS data for at least four hours;

it can no longer track your position. You need to manually input your position

(see Setting the GPS position manually on page 22).

Battery Low The battery voltage output is too low (below 10.5 VDC).

Battery High The battery voltage output is too high (above 16.0 VDC).

Triple Watch Triple Watch is turned on.

Dual Watch Dual Watch is turned on.

Using the radio in normal mode

• To transmit, press and hold the PUSH TO TALK button on the

microphone. Release the button when you are nished talking.

• For the best sound quality, hold the microphone about two inches from

your mouth while you’re talking.

• Press the CHANNEL UP button on the radio or the

▲

button on the

microphone to move up one channel at a time. Press and hold either

button to scroll quickly up the channels.

• Press the CHANNEL DOWN button on the radio or the

▼

button on

the microphone to move down one channel at a time. Press and hold

either button to scroll quickly down the channels.

• To change the transmit power, press the 1/25W button. The transmit

power switches between 1 watt and 25 watts each time you press the

1/25W button.

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How It Works

09 16 09 16 09 16

Every 2 seconds, the radio

checks channels 9 & 16.

with Triple Watch on

Monitoring Channel 25

Press and hold the 16/9-TRI button (on the radio or the microphone) for two

seconds to turn Triple/Dual Watch on or off. (To change between Triple or

Dual Watch, see page 21.)

Normal mode with Triple and Dual Watch

If you activate Triple Watch while operating in normal mode, the radio checks

channels 16 and 9 every two seconds; with Dual Watch turned on, the radio

only checks channel 16. The radio will not check channels 16 or 9 while you

are actively transmitting; it waits until your transmission is nished and then

checks the channels.

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How It Works

Scan mode

You can save channels into memory and then use scan mode to monitor

those channels. When the radio detects a signal on a channel, it pauses on

that channel as long as the signal is received; when the transmission stops,

the radio will continue scanning.

1008 1312 17

15 20

The radio scans about

5 channels in 1 second.

When it detects a signal, the radio stays on the

channel until you press the

CHANNEL

button or the

signal stops.

Resume scan

In scan mode, you can get the following information from the display (some

indicators will not always be displayed):

1 Watt INT

Memory

Scanning Channels

01,03,05,06,07,08

Transmit power

last used

Channel mode

(USA, CANadian,

or INTernational)

Current

channel being

scanned

Scan list (if the

text is too long,

the line scrolls)

All scanned

channels must

be in memory

Normal scan

mode or Triple/

Dual-watch on

Using the radio in scan mode

You cannot transmit while in scan mode.•

You must have two or more channels in memory to start a scan.•

To save a channel into memory, select the channel, then press and •

hold the SCAN-MEM button for two seconds. Memory will show on the

display.

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How It Works

To remove a channel from memory, set the radio to that channel, then •

press and hold the SCAN-MEM button for two seconds. Memory will no

longer show on the display.

To activate scan mode, press the • SCAN-MEM button. Press the SCAN-

MEM button again to return to the previous mode.

When the radio automatically stops on a channel, press the • CHANNEL

UP button to leave that channel and resume scanning.

To end the scan, press the microphone • PUSH TO TALK button or the

SCAN-MEM button. The radio remains on the last scanned channel.

Scan mode with Triple and Dual Watch

If you activate Triple Watch while

operating in scan mode, the radio

checks channels 16 and 9 every

two seconds, then goes on to

scan the next channel; with Dual

Watch turned on, the radio only

checks channel 16:

09 16

Every 2 seconds,

the radio checks

channels 9 & 16

then goes on to

the next channel.

with Triple Watch on

Memory Channel Scan

08 252417151413121110 20

Reversed 16 & 9

UJ-SW 20061215 #17

Press and hold the 16/9-TRI button (on

the radio or the microphone) for two

seconds to turn Triple/Dual Watch on or

off. (To change between Triple or Dual

Watch, see page 21.)

UM425 VHF OM.indd 17 28/9/11 11:55:16 AM

Using Your Radio

Individual

Group

All Ships

POS Request

Position Send

Test

Directory

SELECT

New

SELECT

5. When the ninth digit is correct, press the SELECT button. The radio

displays the new MMSI number and asks you to conrm.

6. To save this MMSI number, select Yes. To cancel this MMSI number,

select No. The radio returns to the Setup menu.

1. Display the menu and choose the DSC Call sub-menu.

2. Select Directory. The screen displays any previously-entered MMSI

numbers and names.

3. To add a new MMSI number to the directory, select New.

4. The radio prompts you to enter the nine-digit MMSI number. Use the

CHANNEL UP and CHANNEL DOWN buttons to change the rst digit; the

CHANNEL UP button increases the number and the CHANNEL DOWN

button decreases the number.

5. When the rst digit is correct, press the SELECT button. The cursor

moves to the next digit. Enter the remaining eight digits of the MMSI

number in the same way.

6. When the ninth digit is correct, press the SELECT button.

7. The radio prompts you to enter a name for this MMSI number; the

name is what you will see in the directory list. Each name can be up

to 12 characters. Use the CHANNEL UP and CHANNEL DOWN buttons

to change the rst character. The channel buttons scroll through the

available characters according to the following table:

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Using Digital Selective Calling (DSC) Features

CHANNEL UP button CHANNEL DOWN button

Capital letters (A through Z) One blank space

Lower-case letters (a through z) Numbers (0 through 9)

Punctuation (/ ‘ + -) Punctuation (/ ‘ + -)

Numbers (0 through 9) Lower-case letters (a through z)

One blank space Capital letters (A through Z)

Table 6 - Character and text entry order

8. When the rst character is correct, press the SELECT button. The cursor

moves to the next character. Enter the remaining 11 characters of

the name. If the name is shorter than 12 characters, press and hold

the SELECT button to complete the name entry. (If you press and hold

the SELECT button without entering a name, the radio uses the MMSI

number in the directory list.)

9. When you nish entering the name, the radio displays the new MMSI

number and name and asks you to conrm. To save this directory

entry, select Yes; to cancel this directory entry, select No. The radio

returns to the directory list.

10. To change an existing directory entry, select the entry you want to

change.

11. To delete the directory entry, select Delete. To edit the code, select

Edit, then use CHANNEL UP and CHANNEL DOWN buttons to edit the

MMSI number and the name.

12. When you are satised with the directory list, select Exit to close the

menu screen.

UM425 VHF OM.indd 28 28/9/11 11:55:17 AM

Using Digital Selective Calling (DSC) Features

CHANNEL UP button CHANNEL DOWN button

Capital letters (A through Z) One blank space

Lower-case letters (a through z) Numbers (0 through 9)

Punctuation (/ ‘ + -) Punctuation (/ ‘ + -)

Numbers (0 through 9) Lower-case letters (a through z)

One blank space Capital letters (A through Z)

Making DSC Calls

There are essentially four different types of DSC voice calls:

Call type What it does When to use it

Distress Alerts all stations that you need

assistance and sends them your

current position.

In an emergency only.

Individual Calls a single station using the

User MMSI.

Any time you want to talk to

another station.

Group Calls all the stations that have the

same Group MMSI as yours.

Any time you want to talk with

the whole group you are traveling

with at the same time.

All ships Calls all stations in range of your

radio.

Safety warnings (e.g., debris

in the water) or an urgency

situation.

All ships call

Group

call

Individual

call

All ships call

For examples of how you might use different call types, see the diagram

below:

(dotted circles) (dotted circles)

UM425 VHF OM.indd 29 28/9/11 11:55:17 AM

Using Digital Selective Calling (DSC) Features

Suppose you are coordinating safety for a sailboat race. Before the race

starts, you instruct all the racers to enter your group MMSI number into their

radios. During the race:

• Throughout the race, you use group calling to update the racers on the

time, race status, and any course corrections.

• A power boat full of spectators comes a little too close to the race path.

You use individual calling to contact the power boat and advise them to

stay clear of the race.

• You see a rowboat entering the area, but since it doesn’t have a radio,

you can’t communicate with the rowboat. You use all ships calling to

alert all the other boats in the area of the possible danger.

Calling a single station (Individual Call)

To call a single station with DSC, follow the steps below:

Press the 1. MENU-PA button to display the menu.

Choose the 2. DSC Call sub-menu, then select Individual.

The radio displays the names listed in your directory; use 3. CHANNEL UP

and CHANNEL DOWN buttons to highlight the directory entry you want to

call and press the SELECT button.

If you want to call a station that is not in your directory, select Manual.

The radio prompts you to enter the MMSI number you want to call.

Enter the MMSI number the same way you enter directory entries (see

page 27) Enter all nine digits and press the SELECT button.

The radio prompts you to select a response channel. Use 4. CHANNEL UP

and CHANNEL DOWN buttons to scroll through the available channels.

When you reach the channel you want to use for a response, press the

SELECT button.

The radio displays the MMSI number you are about to call and asks 5.

you to conrm. If you want to call the displayed MMSI number, select

Send. To cancel the call, select Cancel.

The radio automatically switches to channel 70 to transmit the call 6.

request.

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Using Digital Selective Calling (DSC) Features

When the other station accepts the call, both radios switch to the se-•

lected response channel for voice transmission.

If the other station cannot respond on the channel you selected, the •

radio displays Not support CH.

Calling a particular group of stations (Group Call)

Group calling calls all the stations that share your group MMSI. You must

have a group MMSI programmed into the radio to make a group call, and

the stations (boats) you are calling must have this same group MMSI

programmed into their radios.

Calling all stations (All-Ships Call)

All ships calling contacts all DSC radios within range of your boat. You should

only use all ships calling in the event of a Safety warning (such as debris in

the water) or to request assistance in an Urgency (any situation where your

vessel has a serious problem but is not yet in distress).

Open the menu and select the 1. DSC Call sub-menu.

Select 2. All Ships, and then choose whether this is an Urgency call or a

Safety call.

The radio asks you to conrm the call. Select 3. Send to continue with the

call or select Cancel to cancel the call.

The radio automatically switches to channel 70 to transmit the call 4.

request then automatically switches to channel 16, the designated

response channel for all-ships calling.

Press the 1. MENU-PA button to display the menu.

Choose the 2. DSC Call sub-menu and select Group.

The radio prompts you to select a response channel. Use the 3. CHANNEL

UP and CHANNEL DOWN buttons to scroll through the available channels.

When you reach the channel you want to use for a response, press the

SELECT button.

The radio asks you to conrm the call. Select 4. Send to continue with the

call or select Cancel to cancel the call.

The radio switches to channel 70 to transmit the call request then 5.

automatically switches to the selected response channel.

UM425 VHF OM.indd 31 28/9/11 11:55:17 AM

Using Digital Selective Calling (DSC) Features

Making an automatic distress call

If you have programmed your MMSI number, the UM425 can transmit an

automated distress call with your current location and nature of the distress.

The radio then monitors the channel 16 for a response and repeats the

distress call every few minutes until it receives an acknowledgement.

To send an automatic distress call, press and hold the DISTRESS button

for three seconds. If no MMSI number has been programmed, the radio

prompts you to enter your MMSI number.

If you want to include the nature of your distress in the distress call, use the

distress procedure below:

1. Press the DISTRESS button.

2. The radio displays the list of distress conditions; use the CHANNEL UP

and CHANNEL DOWN buttons to highlight the nature of your distress,

then press and hold the DISTRESS button for three seconds.

• Undesignated

• Fire

• Flooding

• Collision

• Grounding

• Capsizing

• Sinking

• Adrift

• Abandoning

• Piracy/Armed

• Overboard

3. If no MMSI number has been programmed, the radio prompts you to

enter your MMSI number.

Canceling an automatic distress call

While the radio is waiting for a response, it gives you the option of canceling

the call. To cancel the distress call, highlight Cancel and press the SELECT

button.

UM425 VHF OM.indd 32 28/9/11 11:55:17 AM

Using Digital Selective Calling (DSC) Features

Receiving a DSC call

If your radio receives an individual DSC call from another station, it sounds

an incoming call tone and displays the name or MMSI number of the station

calling you. To respond to the call, select Send: Able-Comply; the radio sends

an acknowledgement and automatically switches to the designated response

channel. To reject the call, select Send: Unable-Comply; the radio advises the

other station that you are unable to respond to the call.

If the DSC request contains a response channel that you are not allowed to

use, the radio displays Not Support CH; your only response option is Send:

Unable-Comply.

If the radio receives a group or all ships call, it sounds an incoming call tone

and automatically switches to the designated response channel.

Receive log

Just like your telephone’s caller ID list, your radio keeps track of the calls you

receive but do not answer. The receive log is useful if you have been off your

boat or away from your radio and want to see who has tried to contact you.

The radio displays the last 10 distress calls and the last 20 non-distress calls

that it received.

123456789

987654321

[Exit]

Distress Log

DSC Call

SELECT

Receive Log

SELECT

Distress

SELECT

Press the 1. MENU-PA button to display the menu.

Choose the 2. DSC Call sub-menu and then select Receive Log.

Select 3. Distress to see the last 10 distress call received by the radio.

Select Other to see the last 20 normal calls received by the radio, then

choose from Individual, Group or All Ships calls.

Calls are listed in the order they were received, with the newest call 4.

shown rst. The display blinks if there are new calls you have not

reviewed.

Select the call you want to see the details of. Use 5. CHANNEL UP and

CHANNEL DOWN buttons to see all of the information. The log displays

different information depending on type of call received. See the table

below for the information stored for each type of call:

UM425 VHF OM.indd 33 28/9/11 11:55:17 AM

Using Digital Selective Calling (DSC) Features

DSC Call Type Receive Log Information

Distress MMSI (or name), position, time, nature code.

Distress Acknowledge MMSI (or name), distress MMSI, position, time,

nature code.

Distress Relay MMSI (or name), distress MMSI, position, time,

nature code.

Distress Relay Acknowledge MMSI (or name), distress MMSI, position, time,

nature code.

Geographical MMSI (or name), category code.

All Ships MMSI (or name), category code.

Group MMSI (or name), category code.

Individual MMSI (or name), category code.

Individual Acknowledge MMSI (or name), Completed/Unattended, category

code.

Test MMSI (or name), category code.

Test Acknowledge MMSI (or name), category code.

Pos Reply MMSI (or name), position, time, category code.

Pos Request MMSI (or name), category code.

Pos Send MMSI (or name), position, time, category code.

6. Press the MENU-PA button to exit the detail screen and return to the log

menu.

7. From the log menu, select Exit to close the receive log and return to

the mode you were in.

Returning a call

You can return individual calls directly from the receive log. From the call

detail screen, press the CHANNEL DOWN button until Call Back appears at the

bottom of the display. Press the SELECT button to return that station's call.

Table 7 - Receive Log

UM425 VHF OM.indd 34 28/9/11 11:55:18 AM

Using Digital Selective Calling (DSC) Features

Making Test Calls (Test)

Press the 1. MENU-PA button to display the menu.

Choose the 2. DSC Call sub-menu, then select Test.

The radio displays the names listed in your directory; use the 3. CHANNEL

UP and CHANNEL DOWN buttons to highlight the directory entry you want

to send a test call to and press the SELECT button.

If you want to send a test call to a station that is not in your directory,

select Manual. The radio prompts you to enter the MMSI number you

want to call. Enter the MMSI number the same way you enter directory

entries (see page 27). Enter all nine digits and press the SELECT

button.

The radio displays the MMSI number you 4.

are about to call and asks you to conrm.

If you want to call the displayed MMSI

number, select Send. To cancel the call,

select Cancel.

The radio automatically switches to chan-5.

nel 70 to transmit the test call request,

then switches back to the last-used channel.

You can use the test call feature to make sure your radio is working and

congured correctly. To avoid overloading coastal receiving stations, you

should limit test calls to these stations to once a week.

NOTE: Many coastal stations have specic frequencies and MMSI numbers

you should use for making test calls. Be sure to check with the coastal station

before making a DSC test call.

[Manual]

John Henry

Sam Adams

Test

DSC Call

SELECT

Test

SELECT

Send

Cancel

Test

123456789

UM425 VHF OM.indd 35 28/9/11 11:55:18 AM

Using Digital Selective Calling (DSC) Features

Requesting another station's position (POS Request)

Anytime you need to know where another boat currently is—to nd your

boating partners, to respond to a request for assistance, etc.—you can send

a position request to their radio:

When the other station acknowledges 6.

the test call, the radio displays an ac-

knowledgement screen.

Receiving a test call

When another station sends you a test call,

the radio displays the test request screen:

To acknowledge the test call, select Reply

To reject the test call, select Cancel.

Enabling automatic test call reply

If you want the radio to automatically reply to all test call, you can enable

automatic test call reply.

Press the 1. MENU-PA button to display the menu.

Select 2. Setup and then Test Reply.

Highlight 3. Auto and press the SELECT button. The radio will

automatically send an acknowledgement when it receives a test call.

To disable automatic test call reply, repeat the steps above and select 4.

Manual.

Test

Acknowledged

123456789

Completed

Auto

Manual

Test Reply

Setup

SELECT

Test Reply

SELECT

Cancel

Test

123456789

UM425 VHF OM.indd 36 28/9/11 11:55:18 AM

Using Digital Selective Calling (DSC) Features

Press the 1. MENU-PA button to display the menu.

Choose the 2. DSC Call sub-menu, then select POS Request.

The radio displays the names listed in your directory; use 3. CHANNEL UP

and CHANNEL DOWN buttons to highlight the directory entry you want to

contact and press the SELECT button. If you want to contact a station

that is not in your directory, select Manual. The radio prompts you to

enter the MMSI number you want to call. Enter the MMSI number the

same way you enter directory entries (see page 27). Enter all nine

digits and press the SELECT button.

The radio displays the MMSI number you are about to contact and 4.

asks you to conrm. If you want to request the position of the displayed

MMSI number, select Send. To cancel the request, select Cancel.

When the other station responds, the radio displays the MMSI number, 5.

the longitude, and the latitude of the other station. If your radio is

connected to a chartplotter through the NMEA OUT connection (see

page 48), the position information will also be displayed on the plotter

screen.

If the other station does not have valid GPS data, the radio displays 6. No

Position.

Receiving a position request (Position Reply)

When another station requests your current position, the radio displays the

following screen:

Cancel

POS Request

JOHN HENRY

To send your current position to the other

station, select Reply; the radio transmits your

latitude and longitude to the other station. If

you select Reply but the radio does not have

valid GPS data, it transmits the reply code

with No Position.

To reject the position request, select Cancel.

Enabling automatic position reply

If you want the radio to automatically transmit your current position whenever

it receives a position request, you can enable automatic position reply. Most

boaters activate automatic position reply for safety reasons or because they

subscribe to a marine towing service. Sometimes—for example, in some

competitive situations--you may not want other stations to get your position

without your manual conrmation

UM425 VHF OM.indd 37 28/9/11 11:55:19 AM

Using Digital Selective Calling (DSC) Features

Press the 1. MENU-PA button to display the menu.

Select 2. Setup and then POS Reply.

Highlight 3. Auto and press the SELECT button. The radio will

automatically transmit your position when it receives a position request.

To disable automatic position reply, repeat the steps above and select 4.

Manual.

Sending your own position (Position Send)

If your radio is connected to a GPS receiver, you can send your boat’s

position to someone else. If you are requesting assistance or using an all

ships call to give a safety warning, you can send your current position so

other stations know where you are:

Press the 1. MENU-PA button to display the menu.

Choose the 2. DSC Call sub-menu, then select Position Send.

The radio displays the names listed in your directory; use 3. CHANNEL UP

and CHANNEL DOWN buttons to highlight the directory entry you want to

contact and press the SELECT button. If you want to contact a station

that is not in your directory, select Manual. The radio prompts you to

enter the MMSI number you want to call. Enter the MMSI number the

same way you enter directory entries (see page 27). Enter all nine

digits and press the SELECT button.

The radio displays the MMSI number you are about to contact and 4.

asks you to conrm. If you want to transmit your position to the

displayed MMSI number, select Send. To cancel the transmission,

select Cancel.

The radio transmits your MMSI number, your longitude, and your 5.

latitude to the other station.

Putting the radio into standby

If you are leaving your radio or do not wish to answer any DSC calls, you can

put your radio in standby mode. If your radio receives an individual call, it will

automatically respond with a message that indicates your radio is currently

"Unattended" on the display of the calling radio. Follow the steps below to put

your radio in standby:

UM425 VHF OM.indd 38 28/9/11 11:55:19 AM

Using Digital Selective Calling (DSC) Features

Unattended

1 Watt INT

Memory

DSC Standby

MENU DSC Call

SELECT

Standby

SELECT

1. Display the menu and choose the DSC Call sub-menu.

2. Select Standby to place your radio in standby mode. The radio displays

the standby screen, above.

3. To cancel standby and return to the mode your radio was in, press any

button.

Disabling automatic channel switching

If you are involved in a bridge-to-bridge call, you may not want the radio to

automatically switch channels when it receives a DSC call. In cases like this,

you can disable automatic channel switching. If you receive an individual call,

the radio will respond with an unattended code, just as if the radio were in

Standby.

Press the 1. MENU-PA button to display the menu.

Select 2. Setup and then Auto CH SW.

Highlight 3. Off and press the SELECT button. The radio will not

automatically switch channels until you reactivate this feature.

NOTE: Use this feature with caution. Deactivating automatic switching and

then forgetting it can make it hard for you to receive DSC calls.

UM425 VHF OM.indd 39 28/9/11 11:55:19 AM

Renaming Channels

If you discover that a marine radio channel has a different common name

in your local area, you can change the name of that channel to make it

easier for you to use (see the channel list on page 57 for the default channel

names). To rename a channel, follow the steps below:

Display the menu and choose the 1. Setup sub-menu.

Select 2. Channel Name. The screen displays the list of channels.

Use 3. CHANNEL UP and CHANNEL DOWN buttons to highlight the channel

you want to change and press the SELECT button.

Select 4. Rename to enter a new name for this channel. The radio

prompts you to enter a new name for this channel. Each name can be

up to 12 characters. Use the CHANNEL UP and CHANNEL DOWN buttons

to change the rst character. (See Table 6 Character and text entry

order on page 28 for the available characters and the order in which

they scroll).

When the rst character is correct, press the 5. SELECT button. The cursor

moves to the next character. Enter the remaining 11 characters of the

name. If the name is shorter than 12 characters, press and hold the

SELECT button to complete the name entry.

When you nish entering the name, the radio displays the new channel 6.

name and asks you to conrm. To save this new channel name, select

Yes; to cancel the change, select No. The radio returns to the channel

list.

To restore a channel back to its original name, select the channel and 7.

choose Default.

When you are satised with the channel list, select 8. Exit to close the

menu screen.

Renaming Channels

UM425 VHF OM.indd 40 28/9/11 11:55:19 AM

Installing the Hardware

Mounting the radio

The UM425 can sit at any angle in the mounting bracket so it can easily

accommodate the best location. First, determine the best place to mount the

radio. For optimum performance, nd a location that can:

• Properly support the weight of the radio, approximately 2 pounds or

0.9 kilograms. You may need to use some type of anchor with the

mounting screws to hold the radio, depending on the surface.

• Keep the battery leads as short as possible.

• Keep the antenna lead-in wire as short as possible.

• Allow free air ow around the heat sink on the rear of the radio.

• Avoid interference with the ship’s compass.

Install the radio into the mounting bracket, and connect the 1. power

cable and accessory cable.

Step 1:

Slide the radio

into the mounting

bracket.

Step 2:

Tighten the mounting knobs

to secure the radio in place.

Installing the Hardware

UM425 VHF OM.indd 41 28/9/11 11:55:20 AM

Installing the Hardware

Position the radio into the desired location. Mark the edges of the 2.

bracket on the mounting surface.

Remove the mounting bracket drill template from the back of the 3.

manual, and use the template to mark the drill holes on the mounting

surface.

Drill the holes for the mounting bracket; be sure to follow any special 4.

requirements of the mounting surface.

Remove the bracket from the radio, and use the mounting hardware to 5.

secure the bracket to the mounting surface.

Hex bolt

Washer

Spring washer

Hex nut

Mounting

bracket

Mounting

surface

Install the radio back into the mounting bracket.6.

UM425 VHF OM.indd 42 28/9/11 11:55:20 AM

Installing the Hardware

Connecting the radio

To operate correctly, your UM425 requires two electrical connections:

• providing it with power from the boat’s electrical system

• connecting a VHF-FM marine antenna to the antenna connector

Power supply requirements VHF antenna requirements

Nominal 13.8 VDC power supply with

a negative ground (10.8 VDC to 15.6

VDC).

Power leads should be kept as short

as possible. A direct connection to the

power supply is ideal.

Minimum of #14 AWG copper wire for

extensions up to 6m, 12 AWG wire for

extensions from 6m to 10m, or 10 AWG

wire for extensions from 10 to 18m

Male PL-259 connector

50 Ω impedance

Minimum 1.2m, 3 dB rated antenna for

sailboats or 2.4m, 6dB rated antenna for

powerboats

Minimum RG-58 lead-in wire for antenna

leads up to 6m to 10m, RG-8X for an-

tenna leads from 6m to 10m, or RG-8U

for antenna leads from 10m to 18m.

13.8V DC

Power

cable

Power

connector

Black wire

(-)

Red wire

(+)

UM425 VHF OM.indd 43 28/9/11 11:55:21 AM

Installing the Hardware

Connect the BLACK wire of the included 1. power cable to the

NEGATIVE (-) side of your power source.

Connect the RED wire of the included 2. power cable to the POSITIVE

(+) side of your power source.

Connect the 3. power cable to the power connector on the back of the

UM425. (The power connector only ts one way.)

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

Install your antenna according to the manufacturer’s instructions. 4.

See Antenna Selection and Installation on page 65 for more details. 5.

Connect the PL-259 connector from the antenna lead-in wire to the 6.

SO238 connector labeled ANTENNA on the back of the UM425.

Radio connector,

SO238 (female

PL-259)

Antenna lead-in

connector,

male PL-259

UM425 VHF OM.indd 44 28/9/11 11:55:21 AM

Installing the Hardware

Connecting accessories

Connecting to a GPS receiver

If you connect the radio to a GPS receiver, the radio can automatically

transmit your current position during an automated distress call or during a

normal DSC call.

The UM425 supports a standard NMEA0183 input from a GPS receiver.

Follow the steps below to connect the UM425 to your GPS receiver:

13.8V DC

Accessory

cable

Accessory

connector

Green: GPS Data IN (+)

Bare wire: Ground/ GPS Data IN (-)

Black: Ext. Speaker (-)/GND

Red: External Speaker (+)

Brown: PA Speaker (+)

Blue: PA Speaker (-)/ GND

Orange: NMEA OUT (-)

Yellow: NMEA OUT (+)

Line up

arrows to

connect

Disconnect the 1. accessory cable from the accessory connection on the

radio.

Connect the BARE wire of the included 2. accessory cable to the

GROUND WIRE on your GPS receiver.

Connect the GREEN wire of the included 3. accessory cable to the GPS

DATA OUTPUT WIRE on your GPS receiver. On page 46 is a table of

common GPS receivers and the proper connections:

NOTE: If not using the accessory connector make sure the cap is rmly secured.

UM425 VHF OM.indd 45 28/9/11 11:55:22 AM

Installing the Hardware

Table 8 - Common GPS receivers and connections

GPS Manufacturer Model Number(s)

GPS NMEA0183 OUTPUT

Wire Color

(Connect to GREEN WIRE

on UM425)

Ground Wire Color

(connect to BARE

WIRE on UM425)

Furuno GP1650, GP1850 White Black

Furuno GP30, GP36 White Blue

Garmin Fixed Mount

Models

Blue Black

Garmin Portable Models Brown Black

JRC 100 Series Green Black

JRC 200 Series White Black

JRC GPS500 Yellow Green

Lowrance / Eagle Fixed Mount

Models

White Black

Lowrance / Eagle Portable Models Orange Black

Magellan Fixed Mount

Models

Gray Black

Magellan Portable Models Orange Black

Northstar All Models Yellow Black

RayMarine 420 Yellow Brown

RayMarine 520 / 620 Blue Brown

RayMarine RL Series White Brown

Simrad All Models White Brown

Sitex Neptune, Nautilus Gray Brown

Standard CP150 / CP150C Green Yellow

Be certain all wire connections are secure and that all open wires are 4.

adequately covered.

If you are nished connecting all external accessories, line up the 5.

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

UM425 VHF OM.indd 46 28/9/11 11:55:22 AM

Installing the Hardware

When the GPS receiver is correctly connected, the display shows GPS Data

OK. If there is a problem with the GPS connection, the display shows Check

GPS. When the display shows GPS Data OK, press the SELECT button to

open the GPS status screen and see detailed GPS data:

06/20 11:00:00

208

30. 0 KT

40. 610 N

139

46. 564 E

Date

Time

Current

channel

Course

Latitude

Longitude Speed

Conguring the GPS

If the radio is receiving valid GPS data, it will automatically set the clock to

your local time based on the GPS location. You can adjust your local time

forward or back one hour if necessary (for example, if you are close to the

border of a time zone); you can also adjust for Daylight Savings Time.

Follow the steps below to adjust the time:

Display the menu and choose the 1. Setup sub-menu.

Select 2. GPS Setup and then choose Time Adjust.

The display shows your current local time. To adjust the time forward 3.

one hour, use the CHANNEL UP button. To adjust the time back one hour,

use the CHANNEL DOWN button. Press the SELECT button when you are

nished.

The display prompts you to conrm the setting: choose 4. Set to save the

new time or Cancel to exit time setup without saving. The radio returns

to the GPS Setup menu.

If your local area observes Daylight Savings Time, highlight5. Daylight

Save and press the SELECT button.

09 : 14

Time Adjust

Use the up or down

arrows to adjust the

time by one hour.

MENU Setup

SELECT

GPS Setup

SELECT

Time Adjust

SELECT

UM425 VHF OM.indd 47 28/9/11 11:55:22 AM

Installing the Hardware

Connecting to a charplotter

The UM425 provides a standard NMEA0183 GPS output that you can

connect to a chartplotter. When it receives another boat’s position data in a

DSC call, the radio sends the position data to the chartplotter so you can see

the location:

If Daylight Savings Time is currently in effect, select6. On. If Daylight

Savings Time is not currently in effect, select Off.

Press the 7. SELECT button. The radio activates the new time setting and

returns to the GPS Setup menu.

Disconnect the 1. accessory cable from the accessory connection on the

radio.

Connect the ORANGE wire of the 2. accessory cable to the NEGATIVE

(-) wire of your chartplotter’s NMEA data INPUT.

Connect the YELLOW wire of the 3. accessory cable to the POSITIVE

(+) wire of your chartplotter’s NMEA data INPUT

Be certain all wire connections are secure and that all open wires are 4.

adequately covered.

If you are nished connecting all external accessories, line up the 5.

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

Connecting to an external speaker

You can use an external speaker to monitor the radio from a different part of

your boat or in a noisy environment. If you adjust the VOLUME-PWR knob on

the radio, it will also adjust the external speaker volume.

The UM425 supports an external speaker with the following specications:

• Minimum impedance of 4 Ohms

• Minimum power handling of 10 Watts

UM425 VHF OM.indd 48 28/9/11 11:55:22 AM

Installing the Hardware

Disconnect the 1. accessory cable from the accessory connection on

the radio.

Connect the BLACK wire of the 2. accessory cable to the GROUND

WIRE of your external speaker.

Connect the RED wire of the 3. accessory cable to the POSITIVE (+)

WIRE of your external speaker.

Be certain all wire connections are secure and that all open wires are 4.

adequately covered.

If you are nished connecting all external accessories, line up the 5.

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

Connecting to an external PA speaker

If you connect the radio to a PA speaker, you can use the PA feature to make

announcements to other boats and people nearby.

The UM425 supports an external PA speaker with the following specications:

• Minimum impedance of 4 Ohms

• Minimum power handling of 10 Watts

1. Disconnect the accessory cable from the accessory connection on the

radio.

2. Connect the BLUE wire of the accessory cable to the GROUND

WIRE of your PA system.

3. Connect the BROWN wire of the accessory cable to the POSITIVE

(+) WIRE of your PA system.

4. Be certain all wire connections are secure and that all open wires are

adequately covered.

5. If you are nished connecting all external accessories, line up the

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

UM425 VHF OM.indd 49 28/9/11 11:55:22 AM

Installing the Hardware

Press and hold the microphone 2.

PUSH TO TALK button. Speak clearly

in your normal voice (you don’t have

to shout). Use the VOLUME-PWR knob

on your UM425 to adjust the volume of the PA speaker.

Release the 3. PUSH TO TALK button when you're nished talking.

To turn off the PA feature and return to the radio mode you were using, 4.

press and hold the MENU-PA button for two seconds again.

Public Address

Mode Selected

Using the PA feature

Press and hold the 1. MENU-

PA button for two seconds

to activate the PA feature.

The display shows PA in the

upper right hand corner.

UM425 VHF OM.indd 50 28/9/11 11:55:22 AM

Maintenance and Troubleshooting

Due to its rugged design, the UM425 requires very little maintenance. Howev-

er, it is a precision electronic instrument, so you should follow a few precau-

tions:

If the antenna has been damaged, you should not transmit except in •

the case of an emergency. A defective antenna may cause damage to

your radio.

You should arrange for periodic performance checks with your Uniden •

dealer.

Common questions

Problem Things to Try

The radio won’t power on. Check the power connections.

Check the fuse.

Check the master battery switch and branch

circuit that connect to the radio.

The radio won’t transmit. Make sure you are not in scan mode.

Make sure you are not trying to transmit on a

receive-only channel (see the channels and

frequency tables starting on page 57).

Make sure you are transmitting at the correct

power level for this channel (see the channels and

frequency tables starting on page 57).

Make sure the duration of each transmission is

less than 5 minutes.

Noise comes out of the

speaker all the time

Adjust the squelch level; it is probably too low.

I can’t hear anything (no vol-

ume) from the speaker.

Adjust the squelch level; it is probably too high.

I can transmit, but no one can

hear me.

Check your UIC channel settings (see Setting the

UIC channel mode (USA/CAN/INT) on page 12).

I can’t read the display. Adjust the contrast and backlight brightness level

(see page 22)

The display is too bright at

night.

Adjust the backlight brightness level.

(see page 22)

I can’t see any words on the

display.

Reset the radio back to the default contrast level:

turn off the radio; hold the menu key and turn it

back on.

UM425 VHF OM.indd 51 28/9/11 11:55:22 AM

Maintenance and Troubleshooting

Problem Things to Try

I’m not getting any GPS data

on my display.

Make sure your GPS receiver is correctly

connected (see Connecting to a GPS receiver).

Make sure your GPS receiver is working properly.

Make sure that your GPS receiver supports the

NMEA parameters described in NMEA Operation

on page 63.

I can’t make Group DSC calls. Make sure the Group MMSI was entered

correctly.

Where can I nd my radio’s

serial number?

Look on the bottom side of the radio

The radio won’t let me enter

my User MMSI. What do I do?

Contact customer service by visiting the customer

support page on www.uniden.com.au or

www.uniden.co.nz.

UM425 VHF OM.indd 52 28/9/11 11:55:22 AM

Maintenance and Troubleshooting

Engine Noise Suppression

Interference from the noise generated by the electrical systems of engines

is sometimes a problem with radios. The UM425 has been designed to be

essentially impervious to ignition noise and alternator noise. However, in

some installations it may be necessary to take measures to further reduce the

effect of noise interference. The UM425 radio DC battery wires, antenna lead,

and accessory cables should be routed away from the engine and engine

compartment, and from power cabling carrying high currents. In severe cases

of noise interference, it may be necessary to install a noise suppression kit.

Contact the dealer where you purchased the radio for more information.

UM425 VHF OM.indd 53 28/9/11 11:55:22 AM

Specifications

Table 9 - Radio specications

(All specications are subject to change without notice.)

General

Controls VO L U M E -PW R , Squelch

Status Indicators Transmit power, Scan mode, Triple Watch mode, Battery

High, Battery low, USA, CAN, INT, Memory, GPS status

and Channel Display

Display LCD (Full Dot Matrix)

Buttons 16/9-Tri, Scan-Mem, Channel Up, Channel Down, Menu-

PA, Select, 1/25W, and Distress.

Connectors Antenna, accessory, and DC power

Size H 66.6 mm x W 162.6 mm x L 128 mm (without Heat Sink)

H 2.62 inches x W 6.40 inches x L 5.04 inches (without

Heat Sink)

Weight 0.93kg (2.05 pounds)

Supply Voltage Nominal 13.8V DC, negative ground (10.8 VDC to 15.6

VDC)

Standard Accessories Mounting bracket and hardware, DC power cable,

microphone hanger, spare fuse, accessory cable

Antenna Impedance 50 Ω nominal

Microphone Rugged 2 kΩ condenser mic element with coiled cord

Speaker 45 mm (1.77 inch), 8 Ω

Operating Temperature Range –15 °C to + 55 °C (+5 °F to +131 °F)

Shock and Vibration Meets or exceeds EIA standards, RS152B and RS204C

Specications

UM425 VHF OM.indd 54 28/9/11 11:55:22 AM

Specifications

Transmitter

Power Output 1 watt or 25 watt (user selectable)

Power Requirement 25 watts output: 6A@13.8V DC

Modulation ±5 kHz deviation

Hum and Noise Signal-to-Noise 45 dB with 3 kHz deviation with 1000 Hz modulating

frequency (nominal)

Audio Distortion Less than 8% with 3 kHz deviation with 1000 Hz

modulating frequency

Spurious Suppression -45 dBm @ Hi, -55 dBm @ Lo

Output Power Stabilization Built-in automatic level control (ALC)

Frequency Range 156 to 158 MHz

Frequency Stability ±1.5kHz @ –15°C to + 55°C

Receiver

Frequency Range 156 to 162 MHz

Sensitivity 0.25 μV for 12 dB SINAD

Circuit Dual Conversion Super Heterodyne PLL (Crystal for DSC)

Squelch Sensitivity 0.2 μV Threshold

Spurious Response 75 dB

Adjacent Channel Selectivity 78 dB @ ±25 kHz

Audio Output Power 2.5 watts (10% Distortion, 8 Ω load)

Power Requirement 400 mA @ 13.8V DC at squelched, 1000 mA @ 13.8V DC

at maximum audio output

IF Frequencies 1st 41.925 MHz, 2nd 455 kHz (1st 21.7 MHz, 2nd 455 kHz

for DSC)

UM425 VHF OM.indd 55 28/9/11 11:55:22 AM

Specifications

UM425 VHF OM.indd 56 28/9/11 11:55:22 AM

Specifications

Table 10 - International Channel Frequencies and Channel Tag

Ch No. RX Freq TX Freq Status Full Name

1 160.6500 156.0500 Duplex Marine operator

2 160.7000 156.1000 Duplex Marine operator

3 160.7500 156.1500 Duplex Marine operator

4 160.8000 156.2000 Duplex Marine operator

5 160.8500 156.2500 Duplex Marine operator

6 156.3000 156.3000 Simplex Inter-ship safety

7 160.9500 156.3500 Duplex Marine operator

8 156.4000 156.4000 Simplex Commercial (ship-ship)

9 156.4500 156.4500 Simplex Boater calling channel

10 156.5000 156.5000 Simplex Commercial

11 156.5500 156.5500 Simplex Vessel trafc system

12 156.6000 156.6000 Simplex Vessel trafc system

13 156.6500 156.6500 Simplex Bridge to bridge

14 156.7000 156.7000 Simplex Vessel trafc system

15 156.7500 156.7500 Simplex, 1W Environmental

16 156.8000 156.8000 Simplex Distress, Safety, Calling

17 156.8500 156.8500 Simplex, 1W Govt maritime control

18 161.5000 156.9000 Duplex Port operation

19 161.5500 156.9500 Duplex Commercial

20 161.6000 157.0000 Duplex Port operation

21 161.6500 157.0500 Duplex Port operation

22 161.7000 157.1000 Duplex Port operation

23 161.7500 157.1500 Duplex Marine operator

24 161.8000 157.2000 Duplex Marine operator

25 161.8500 157.2500 Duplex Marine operator

26 161.9000 157.3000 Duplex Marine operator

27 161.9500 157.3500 Duplex Marine operator

28 162.0000 157.4000 Duplex Marine operator

60 160.6250 156.0250 Duplex Marine operator

61 160.6750 156.0750 Duplex Marine operator

62 160.7250 156.1250 Duplex Marine operator

63 160.7750 156.1750 Duplex Marine operator

64 160.8250 156.2250 Duplex Marine operator

65 160.8750 156.2750 Duplex Marine operator

66 160.9250 156.3250 Duplex Marine operator

67 156.3750 156.3750 Simplex Bridge to bridge

68 156.4250 156.4250 Simplex Non commercial

69 156.4750 156.4750 Simplex Non commercial

70 ( 156.5250 156.5250 ) DSC Only DSC

Channel and frequencies

UM425 VHF OM.indd 57 28/9/11 11:55:23 AM

Specifications

Ch No. RX Freq TX Freq Status Full Name

71 156.5750 156.5750 Simplex Non commercial

72 156.6250 156.6250 Simplex Non commercial

73 156.6750 156.6750 Simplex Port operation

74 156.7250 156.7250 Simplex Port operation

75 156.7750 156.7750 Simplex, 1W Port operation

76 156.8250 156.8250 Simplex, 1W Port operation

77 156.8750 156.8750 Simplex Port operation (ship-ship)

78 161.5250 156.9250 Duplex Port operation

79 161.5750 156.9750 Duplex Port operation

80 161.6250 157.0250 Duplex Port operation

81 161.6750 157.0750 Duplex Port operation

82 161.7250 157.1250 Duplex Port operation

83 161.7750 157.1750 Duplex Port operation

84 161.8250 157.2250 Duplex Marine operator

85 161.8750 157.2750 Duplex Marine operator

86 161.9250 157.3250 Duplex Marine operator

87 157.3750 157.3750 Simplex Marine operator

88 157.4250 157.4250 Simplex Marine operator

Table 10 - International Channel Frequencies and Channel Tag

(cont'd)

UM425 VHF OM.indd 58 28/9/11 11:55:23 AM

Specifications

Table 11 - USA Channel Frequencies and Channel Tag

Ch No. RX Freq (MHz) TX Freq (MHz) Status Full Name

1 “A” 156.0500 156.0500 Simplex Vessel trafc system/

Commercial

5 “A” 156.2500 156.2500 Simplex Vessel trafc system /

Commercial

6 156.3000 156.3000 Simplex Inter-ship safety

7 “A” 156.3500 156.3500 Simplex Commercial

8 156.4000 156.4000 Simplex Commercial

9 156.4500 156.4500 Simplex Non commercial

10 156.5000 156.5000 Simplex Commercial

11 156.5500 156.5500 Simplex Vessel trafc system

12 156.6000 156.6000 Simplex Vessel trafc system

13 156.6500 156.6500 Simplex, 1W Bridge to bridge

14 156.7000 156.7000 Simplex Vessel trafc system

15 156.7500 Inhibit Receive Only Environmental

16 156.8000 156.8000 Simplex Distress, Safety, Calling

17 156.8500 156.8500 Simplex, 1W Govt maritime control

18 “A” 156.9000 156.9000 Simplex Commercial

19 “A” 156.9500 156.9500 Simplex Commercial

20 161.6000 157.0000 Duplex Port operation

20 “A” 157.0000 157.0000 Simplex Port operation

21 “A” 157.0500 157.0500 Simplex Coast guard only

22 “A” 157.1000 157.1000 Simplex Coast guard

23 “A” 157.1500 157.1500 Simplex Coast guard only

24 161.8000 157.2000 Duplex Marine operator

25 161.8500 157.2500 Duplex Marine operator

26 161.9000 157.3000 Duplex Marine operator

27 161.9500 157.3500 Duplex Marine operator

28 162.0000 157.4000 Duplex Marine operator

63 “A” 156.1750 156.1750 Simplex Vessel trafc system

65 “A” 156.2750 156.2750 Simplex Port operation

66 “A” 156.3250 156.3250 Simplex Port operation

67 156.3750 156.3750 Simplex, 1W Bridge to bridge

68 156.4250 156.4250 Simplex Non commercial

69 156.4750 156.4750 Simplex Non commercial

70 ( 156.5250 156.5250 ) DSC Only DSC

71 156.5750 156.5750 Simplex Non commercial

72 156.6250 156.6250 Simplex Non commercial (ship-ship)

73 156.6750 156.6750 Simplex Port operation

74 156.7250 156.7250 Simplex Port operation

75 156.775 156.7750 Simplex, 1W Port operation

UM425 VHF OM.indd 59 28/9/11 11:55:23 AM

Specifications

Table 11 - USA Channel Frequencies and Channel Tag (cont'd)

The "A" indicates simplex use of the ship station transmit side of an international duplex channel, and that operations are different from that of

international operations on that channel.

Ch No. RX Freq (MHz) TX Freq (MHz) Status Full Name

76 156.825 156.8250 Simplex, 1W Port operation

77 156.8750 156.8750 Simplex, 1W Port operation (ship-ship)

78 “A” 156.9250 156.9250 Simplex Non commercial

79 “A” 156.9750 156.9750 Simplex Commercial

80 “A” 157.0250 157.0250 Simplex Commercial

81 “A” 157.0750 157.0750 Simplex Government

82 “A” 157.1250 157.1250 Simplex Government

83 “A” 157.1750 157.1750 Simplex Coast guard

84 161.8250 157.2250 Duplex Marine operator

85 161.8750 157.2750 Duplex Marine operator

86 161.9250 157.3250 Duplex Marine operator

87 157.3750 157.3750 Simplex Marine operator

88 157.4250 157.4250 Simplex Commercial (ship-ship)

UM425 VHF OM.indd 60 28/9/11 11:55:23 AM

Specifications

Table 12 - Canadian Channel Frequencies and Channel Tag

Ch No. RX Freq TX Freq Status Full Name

1 160.6500 156.0500 Duplex Marine operator

2 160.7000 156.1000 Duplex Marine operator

3 160.7500 156.1500 Duplex Marine operator

4 “A” 156.2000 156.2000 Simplex Canadian coast guard

5 “A” 156.2500 156.2500 Simplex Vessel trafc system

6 156.3000 156.3000 Simplex Inter-ship safety

7 “A” 156.3500 156.3500 Simplex Commercial

8 156.4000 156.4000 Simplex Commercial

9 156.4500 156.4500 Simplex Boater calling channel

10 156.5000 156.5000 Simplex Commercial

11 156.5500 156.5500 Simplex Vessel trafc system

12 156.6000 156.6000 Simplex Vessel trafc system

13 156.6500 156.6500 Simplex, 1W Bridge to bridge

14 156.7000 156.7000 Simplex Vessel trafc system

15 156.7500 156.7500 Simplex Environmental

16 156.8000 156.8000 Simplex Distress, Safety, Calling

17 156.8500 156.8500 Simplex, 1W State control

18 “A” 156.9000 156.9000 Simplex Commercial

19 “A” 156.9500 156.9500 Simplex Canadian coast guard

20 161.6000 157.0000 Duplex, 1W Port operation

21 “A” 157.0500 157.0500 Simplex Canadian coast guard

22 “A” 157.1000 157.1000 Simplex Canadian coast guard

23 161.7500 157.1500 Duplex Marine operator

24 161.8000 157.2000 Duplex Marine operator

25 161.8500 157.2500 Duplex Marine operator

26 161.9000 157.3000 Duplex Marine operator

27 161.9500 157.3500 Duplex Marine operator

28 162.0000 157.4000 Duplex Marine operator

60 160.6250 156.0250 Duplex Marine operator

61 “A” 156.0750 156.0750 Simplex Canadian coast guard

62 “A” 156.1250 156.1250 Simplex Canadian coast guard

63 "A" 156.1750 156.1750 Simplex Port operation

64 160.8250 156.2250 Duplex Marine operator

64 “A” 156.2250 156.2250 Simplex Port operation

65 “A” 156.2750 156.2750 Simplex Port operation

66 “A” 156.3250 156.3250 Simplex, 1W Port operation

67 156.3750 156.3750 Simplex Bridge to bridge

68 156.4250 156.4250 Simplex Non commercial

69 156.4750 156.4750 Simplex Non commercial

70 ( 156.5250 156.5250 ) DSC Only DSC

UM425 VHF OM.indd 61 28/9/11 11:55:23 AM

Specifications

Ch No. RX Freq TX Freq Status Full Name

71 156.5750 156.5750 Simplex Non commercial

72 156.6250 156.6250 Simplex Non commercial

73 156.6750 156.6750 Simplex Port operation

74 156.7250 156.7250 Simplex Port operation

75 156.7750 156.7750 Simplex, 1W Port operation

76 156.8250 156.8250 Simplex, 1W Port operation

77 156.8750 156.8750 Simplex, 1W Port operation

78 “A” 156.9250 156.9250 Simplex Inter ship

79 “A” 156.9750 156.9750 Simplex Inter ship

80 “A” 157.0250 157.0250 Simplex Inter ship

81 “A” 157.0750 157.0750 Simplex Canadian coast guard

82 “A” 157.1250 157.1250 Simplex Canadian coast guard

83 161.7750 157.1750 Duplex Canadian coast guard

83 “A” 157.1750 157.1750 Simplex Canadian coast guard

84 161.8250 157.2250 Duplex Marine operator

85 161.8750 157.2750 Duplex Marine operator

86 161.9250 157.3250 Duplex Marine operator

87 157.3750 157.3750 Simplex Port operation

88 157.4250 157.4250 Simplex Port operation

Table 12 - Canadian Channel Frequencies and Channel Tag (cont'd)

The "A" indicates simplex use of the ship station transmit side of an international duplex channel, and that operations are different from that of

international operations on that channel.

UM425 VHF OM.indd 62 28/9/11 11:55:23 AM

Specifications

NMEA Operation

This radio supports NMEA0183 version 3.01.

NMEA Input

If you have difculty getting the UM425 to receive data from your GPS receiver,

check the device’s conguration. It should be set to the parameters shown in the

table below.

Table 13 - NMEA Input Parameters

Baud rate 4800 bps

Data bits 8

Parity None

Stop bits 1

Data amplitude Over 3.0 V

Drive capability Over 10 mA

The radio supports RMC, GLL, GNS,

GGA and ZDA sentences. When

these sentences are received, the

radio displays latitude/longitude,

date, time, course, and speed. If

any sentence except an RMC or

GLL sentence is received, the radio

uses the information based on the

following priority order.

• Status:RMC > GLL > GNS > GGA

• Latitude/Longitude:RMC > GLL > GNS > GGA

• UTC Time: RMC > GLL > GNS > GGA > ZDA

• Date: RMC > ZDA

• Speed / Course:RMC

NOTES :

• If the radio receives only a GLL sentence, the radio does not display the

current speed, course, and date.

• If the radio receives both RMC and GLL sentences, the radio uses only

the RMC sentence.

• Status data is used to check whether the GPS data is valid or invalid.

NMEA Output

When the radio receives a DSC call (Distress, Position Reply, or Position

Send), it outputs a DSC/DSE sentence from the NMEA output port.

NOTE: When the radio receives a distress call, it outputs a sentence in the

following format.

• $CDDSC,12,3081234000,,07,00,0354013946,0657,,,S,E*6D

• $CDDSE,1,1,A,3081234000,00,60875646*13

Table 12 - Canadian Channel Frequencies and Channel Tag (cont'd)

UM425 VHF OM.indd 63 28/9/11 11:55:23 AM

Regulations and Safety Warnings

Basic radio guidelines

You should familiarize yourself with the rules on marine radios and be aware

of which rules apply to your boat.

DSC: Frequently Asked Questions

The following information is sourced from the Australian Maritime Safety Authority's

DSC FAQ.

What is the status of VHF DSC coverage in Australia?

In Australian waters, VHF DSC is for ship-to-ship alerting. There is no ofcial

shore-based infrastructure but there are a number of volunteer marine rescue

(VMR) stations that have installed VHF DSC and a check with your local

VMR should be made.

VHF DSC for small craft is primarily for distress, urgency and safety

purposes.

How should VHF DSC be used?

In Australian waters, Channel 70 should be used for DSC distress alerts only.

Once an alert has been sent the party in distress should monitor Channel

16, the distress and calling channel. Parties receiving the DSC distress alert

should switch to Channel 16 and acknowledge the MAYDAY call by voice

giving their identity and signalling “Received MAYDAY”. If the party in distress

does not receive an acknowledgement to their DCS alert they should transmit

the standard MAYDAY call by voice on Channel 16. There are still quite a

number of boats that do not carry DSC radios.

Because Channel 16 is the distress and calling frequency it should only be

used for general trafc to raise another party. Once contact has been made,

all routine trafc should be passed on another agreed VHF channel.

Is a call sign or Maritime Mobile Service Identity (MMSI)

needed?

An MMSI is a unique nine-digit code set into your DSC terminal to identify

your vessel. You need only one of these if you have multiple DSC radios. You

use the same MMSI for all radios on board the one vessel as it is a ship’s

identity. Because VHF radios now operate under a Class License there is

no requirement for an ofcial call sign but an operator must have a Maritime

Radio Operators Certicate of Prociency (MROCP).

UM425 VHF OM.indd 64 28/9/11 11:55:23 AM

Regulations and Safety Warnings

How can a MMSI be applied for?

The Australian Maritime Safety Authority allocates MMSI. To apply for an

MMSI complete the MMSI Application form available for download via

www.amsa.gov.au/mmsi. This page has important information about MMSI

and DSC radio.

What qualications are needed to operate a VHF DSC radio?

The minimum qualication to operate a VHF radio with or without DSC is a

Marine Radio Operator’s VHF Certicate of Prociency (MROVCP). VHF

radios are covered by a Class License so an individual station license is no

longer required.

The Marine Radio Operator’s Handbook produced by the Australian Maritime

College provides further information about qualications, licensing and DSC

operations. It is available at www.amcom.amc.edu.au

Antenna Selection and Installation

Your UM425 has been designed to accommodate all of the popular marine VHF

antennas. However, the selection and the proper installation of the antenna is the

responsibility of the user or installer.

The antenna used with this radio should be installed using the following guidelines to

ensure a safe distance between the antenna and persons close by.

Small whip antennas (3 dB) or smaller should be installed with at least 1m away •

from any area where people are likely to be.

Larger antennas (6 dB or 9 dB) should be installed with at least 2m away.•

While the radio is transmitting, do not come closer to the antenna than the •

recommended safe distance.

Do not touch the antenna when the radio is powered on and might begin •

transmitting.

UM425 VHF OM.indd 65 28/9/11 11:55:23 AM

Two Year Limited Warranty

UNIDEN UM425 VHF

IMPORTANT Satisfactory evidence of the original purchase is required for warranty service

Please refer to our Uniden website for any details or warranty durations offered in addition to those

contained below.

Warrantor

The warrantor is either Uniden Australia Pty Limited ABN 58 001 865 498 (“Uniden Aust”) or Uniden New

Zealand Limited (“Uniden NZ”) as the case may be.

Terms of Warranty

Uniden Aust/NZ warrants to the original retail purchaser only that the UM425 VHF (“the Product”), will be

free from defects in materials and craftsmanship for the duration of the warranty period, subject to the

limitations and exclusions set out below.

Warranty Period

This warranty to the original retail purchaser is only valid in the original country of purchase for a Product

first purchased either in Australia or New Zealand and will expire two (2) years from the date of the original

retail sale.

If a warranty claim is made, this warranty will not apply if the Product is found by Uniden to be:

(A) Damaged or not maintained in a reasonable manner or as recommended in the relevant Uniden

Owner’s Manual;

(B) Modified, altered or used as part of any conversion kits, subassemblies or any configurations not sold

by Uniden Aust or Uniden NZ;

(D) Repaired by someone other than an authorized Uniden Repair Agent in relation to a defect or

malfunction covered by this warranty; or

(E) Used in conjunction with any equipment, parts or a system not manufactured by Uniden.

Parts Covered

This warranty covers the Product and included accessories.

User-generated Data

This warranty does not cover any claimed loss of or damage to user-generated data (including but without

limitation phone numbers, addresses and images) that may be stored on your Product.

Statement of Remedy

If the Product is found not to conform to this warranty as stated above, the Warrantor, at its discretion,

will either repair the defect or replace the Product without any charge for parts or service. This warranty

does not include any reimbursement or payment of any consequential damages claimed to arise from a

Product’s failure to comply with the warranty.

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are

entitled to a replacement or refund for a major failure and for compensation for any other reasonably

foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail

to be of acceptable quality and the failure does not amount to a major failure.

This warranty is in addition to and sits alongside your rights under either the COMPETITION AND

CONSUMER ACT 2010 (Australia) or the CONSUMER GUARANTEES ACT (New Zealand) as the case

may be, none of which can be excluded.

Procedure for Obtaining Warranty Service

Depending on the country in which the Product was first purchased, if you believe that your Product does

not conform with this warranty, you should deliver the Product, together with satisfactory evidence of your

original purchase (such as a legible copy of the sales docket) to Uniden at the addresses shown below.

You should contact Uniden regarding any compensation that may be payable for your expenses incurred

in making a warranty claim. Prior to delivery, we recommend that you make a backup copy of any phone

numbers, images or other data stored on your Product, in case it is lost or damaged during warranty

service.

UNIDEN AUSTRALIA PTY LTD

Service Division

345 Princes Highway,

Rockdale, NSW 2216

Phone number: 1300 366 895

Email address: custservice@uniden.com.au

UNIDEN NEW ZEALAND LTD

Service Division

150 Harris Road, East Tamaki

Auckland 2013

Phone number: (09) 273 8377

Email address: service@uniden.co.nz

UM425 VHF OM.indd 66 28/9/11 11:55:23 AM

Mounting Bracket Template

22 mm/

0.87 in (7/8)

156 mm/

6.14 in (6 5/32)

5.5 mm/

0.2 in

(7/32)

18.5 mm/

0.73 in (3/4)

22 mm/

0.87 in (7/8)

36 mm/1.42 in (1 7/16)

40 mm/

1.6 in (1 9/16)

15.5 mm/

0.61 in

(5/8)

53 mm/

2.1 in (2 3/32)

8 mm

/0.31 in

(5/16)

UM425 VHF OM.indd 67 28/9/11 11:55:24 AM

Printed in PRC UTZZ01627ZA(0)

UM425 VHF OM.indd 68 28/9/11 11:55:24 AM

Uniden UM425 VHF DSC User Manual To The 6523143c Ef72 4c42 Abec C779dc6b90dd

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