Standard HORIZON GX1280S User Guide
MATRIX GX1280S
25 Watt VHF/FM
Marine Transceiver
Owner's Manual
Submersible
DSC distress call automatically broadcasts lat/long and vessel ID
DSC position request function and NMEA data input/output
Latitude/Longitude and SOG/COG display
Channel name capability
Optional RAM+ second station remote microphone
Versatile user-programmable Scanning, Priority Scan and Dual Watch
NOAA Weather Alert
One-button access to Channel 16 and 9
Access to all US, Canadian and International channels
Big, back-lit display and keys
8
8
8 with GPS attached
GX1280S Page 1
TABLE OF CONTENTS
SAFETY/WARNING INFORMATION ................................................................ 4
FCC RADIO LICENSE INFORMATION ............................................................ 5
FCC NOTICE ..................................................................................................... 6
GETTING STARTED ......................................................................................... 7
ABOUT VHF RADIO ................................................................................................ 7
SELECTING AN ANTENNA ..................................................................................... 7
COAXIAL CABLE ...................................................................................................... 8
1 GENERAL INFORMATION ......................................................................... 9
1.1 INTRODUCTION ................................................................................................ 9
1.2 FCC / INDUSTRY CANADA INFORMATION ................................................... 9
2 PACKING LIST .......................................................................................... 10
3 OPTIONS ................................................................................................... 10
4 INSTALLATION ......................................................................................... 11
4.1 LOCATION ........................................................................................................ 11
4.2 ELECTRICAL CONNECTIONS ....................................................................... 11
4.3 ACCESSORY CABLE ..................................................................................... 12
4.4 CONNECTION OF GPS WITH NMEA OUTPUT ........................................ 13
4.5 CHECKING GPS CONNECTIONS ................................................................. 14
4.6 CHANGING THE GPS TIME ......................................................................... 14
4.7 CHANGING COG TO TRUE OR MAGNETIC ............................................. 15
4.8 OPTIONAL MMB-84 FLUSH MOUNT INSTALLATION ................................. 16
4.9 OPTIONAL CMP25 RAM+ MIC INSTALLATION .......................................... 17
5 CONTROLS AND INDICATORS ............................................................... 18
5.1 CONTROLS AND CONNECTIONS ................................................................ 18
6 BASIC OPERATION .................................................................................. 23
6.1 RECEPTION ..................................................................................................... 23
6.2 TRANSMISSION ............................................................................................... 23
6.3 TRANSMIT TIME-OUT TIMER (TOT) ............................................................ 23
6.4 SIMPLEX/DUPLEX CHANNEL USE .............................................................. 24
6.5 USA, CANADA, AND INTERNATIONAL MODE ............................................. 24
6.6 NOAA WEATHER CHANNELS ....................................................................... 24
6.7 NOAA WEATHER ALERT ............................................................................... 25
6.8 NOAA WEATHER ALERT TESTING ............................................................. 25
6.9 EMERGENCY (CHANNEL 16 USE) ................................................................. 26
6.10 CALLING ANOTHER VESSEL (CHANNEL 16 OR 9) .................................. 26
6.11 MAKING TELEPHONE CALLS ..................................................................... 27
6.12 OPERATING ON CHANNELS 13 AND 67 ................................................ 27
6.13 PROHIBITED COMMUNICATIONS .............................................................. 28
6.14 DUAL WATCH (TO CH16) .............................................................................. 28
6.15 MEMORY SCANNING (M-SCAN) ................................................................. 28
6.16 PRIORITY SCANNING (P-SCAN) ................................................................. 29
6.17 NAVIGATION INDICATION ............................................................................ 29
6.18 VOICE SCRAMBLER .................................................................................... 30
6.19 RESETTING THE TRANSCEIVER’S MICROPROCESSOR ...................... 30
7 DIGITAL SELECTIVE CALLING ............................................................... 31
7.1 GENERAL ......................................................................................................... 31
7.2 DSC SCAN ...................................................................................................... 31
7.3 USCG DSC WATCH ....................................................................................... 32
7.3.1 Maritime Mobile Service Identity (MMSI) .................................................... 32
7.3.2 Programming the MMSI ............................................................................... 32
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TABLE OF CONTENTS
7.4 ADDITIONAL DIGITAL SELECTIVE CALLING INFORMATION .................. 33
7.5 DSC DISTRESS CALL ................................................................................... 33
7.5.1 Transmitting a DSC Distress Call .............................................................. 33
7.5.2 Receiving a DSC Distress Call .................................................................. 34
7.6 ALL SHIPS CALL ............................................................................................ 35
7.6.1 Transmitting an All Ships Call .................................................................... 35
7.6.2 Receiving an All Ships Call ........................................................................ 36
7.7 INDIVIDUAL CALL ........................................................................................... 36
7.7.1 Setting up the Individual / Position Call Directory ..................................... 36
7.7.2 Setting up Individual Reply ......................................................................... 37
7.7.3 Setting up Individual Call Ringer ................................................................ 38
7.7.4 Transmitting an Individual Call .................................................................... 39
7.7.5 Receiving an Individual Call ........................................................................ 40
7.7.6 Setting Up the Call Waiting Function ........................................................ 40
7.8 ADVANCED DSC CALLS ............................................................................... 41
7.8.1 Group Call ...................................................................................................... 41
7.8.1.1 Setup a Group Call .................................................................................. 41
7.8.1.2 Transmitting a Group Call ........................................................................ 42
7.8.1.3 Receiving a Group Call ............................................................................ 43
7.8.2 Position Request ........................................................................................... 43
7.8.2.1 Setting up Position Reply ......................................................................... 44
7.8.2.2 Transmitting a Position Request to Another Vessel .............................. 44
7.8.2.3 Receiving a Position Request .................................................................. 45
7.8.3 Position Send ................................................................................................ 46
7.8.3.1 Transmitting a DSC Position Send Call ................................................. 46
7.8.3.2 Receiving a DSC Position Send Call ..................................................... 47
8 RADIO SETUP MODE ............................................................................... 48
8.1 LAMP ADJUSTING .......................................................................................... 48
8.2 LCD CONTRAST ............................................................................................. 48
8.3 TIME OFFSET ................................................................................................. 49
8.4 KEY BEEP (ON / OFF) .................................................................................... 50
8.5 WX ALERT (ON / OFF) .................................................................................... 50
8.6 VOICE SCRAMBLER ...................................................................................... 51
8.7 CHANNEL NAMING ......................................................................................... 52
8.8 TRUE MAGNETIC CHANGE (NAV display) ................................................... 53
9 RAM MIC OPERTION ............................................................................... 54
9.1 RAM MIC CONTROLS ................................................................................... 54
9.2 INTERCOM OPERTION .................................................................................. 57
9.2.1 Communication .............................................................................................. 57
9.2.2 Calling ............................................................................................................ 58
9.3 DSC / RADIO SETUP MODE .......................................................................... 58
10 MAINTENANCE......................................................................................... 59
10.1 REPLACEMENT PARTS ............................................................................... 59
10.2 FACTORY SERVICE ..................................................................................... 60
10.3 TROUBLESHOOTING CHART ..................................................................... 61
11 CHANNEL ASSIGNMENTS ...................................................................... 62
12 WARRANTY .............................................................................................. 68
13 SPECIFICATIONS ..................................................................................... 72
GX1280S Page 3
SAFETY / WARNING INFORMATION
This radio is restricted to occupational use, work related operations only
where the radio operator must have the knowledge to control the exposure
conditions of its passengers and bystanders by maintaining the minimum
separation distance of 0.6 m (2 feet).
Failure to observe these restrictions will result in exceeding the FCC RF
exposure limits.
Antenna Installation:
The antenna must be located at least 0.6 m (2 feet) away from passengers
in order to comply with the FCC RF exposure requirements.
ON-LINE WARRANTY REGISTRATION
Please visit www.standardhorizon.com to register the MATRIX Marine
VHF. It should be noted that visiting the Web site from time to time may
be beneficial to you, as new products are released they will appear on
the STANDARD HORIZON Web site.
PRODUCT SUPPORT INQUIRIES
If you have any questions or comments regarding the use of the MATRIX, you can visit the STANDARD HORIZON Web site to send an E-
Mail or contact the Product Support team at 800-767-2450 M-F 7:005:00PST.
GX1280SPage 4
FCC RADIO LICENSE INFORMATION
Standard Horizon radios comply with the Federal Communication Commission (FCC) requirements that regulate the Maritime Radio Service.
STATION LICENSE
An FCC ship station license is no longer required for any vessel traveling in
U.S. waters (except Hawaii) which is under 20 meters in length. However,
any vessel required to carry a marine radio on an international voyage, carrying a HF single side band radiotelephone or marine satellite terminal is
required to have a ship station license. FCC license forms, including applications for ship (506) and land station licenses can be downloaded via the
Internet at
225-5322.
RADIO CALL SIGN
Currently the FCC does not require recreational boaters to have a Ship Radio
Station License. The USCG recommends the boats registration number and
the state to be used.
CANADIAN SHIP STATION LICENSING
You may need a license when traveling in Canada. If you do need a license
contact their nearest field office or regional office or write:
www.fcc.gov/forms. To obtain a form from the FCC, call (888)
Industry Canada
Radio Regulatory Branch
Attn: DOSP
300 Slater Street
Ottawa, Ontario
Canada, KIA 0C8
GX1280S Page 5
FCC NOTICE
NOTICE
Unauthorized changes or modifications to this equipment may void compliance with FCC Rules. Any change or modification must be approved
in writing by STANDARD HORIZON.
NOTICE
This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that
to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
GX1280SPage 6
GETTING STARTED
ABOUT VHF RADIO
The radio frequencies used in the VHF marine band lie between 156 and
158 MHz with some shore stations available between 161 and 163 MHz.
The marine VHF band provides communications over distances that are
essentially “line of sight” (VHF signals do not travel well through objects
such as buildings, hills or trees). Actual transmission range depends much
more on antenna type, gain and height than on the power output of the
transmitter. On a fixed mount 25W radio transmission expected distances
can be greater than 15 miles, for a portable 5W radio transmission the expected distance can be greater than 5 miles in “line of sight”.
SELECTING AN ANTENNA
Marine antennas are made to radiate signals equally in all horizontal directions, but not straight up. The objective of a marine antenna is to enhance
the signal toward the horizon. The degree to which this is accomplished is
called the antenna’s gain. It is measured in decibels (dB) and is one of the
major factors in choosing an antenna. In terms of effective radiated power
(ERP), antennas are rated on the basis of how much gain they have over a
theoretical antenna with zero gain. A 3 foot, 3dB gain antenna represents
twice as much gain over the imaginary antenna.
Typically a 3 foot 3dB gain stainless steel whip is used on a sailboat mast.
The longer 8 foot 6dB fiberglass whip is primarily used on power boats that
require the additional gain.
GX1280S Page 7
COAXIAL CABLE
VHF antennas are connected to the transceiver by means of a coaxial cable
– a shielded transmission line. Coaxial cable is specified by it’s diameter
and construction.
For runs less than 20 feet, RG-58/U, about 1/4 inch in diameter is a good
choice. For runs over 20 feet but less than 50 feet, the larger RG-8X or RG213/U should be used for cable runs over 50 feet RG-8X should be used.
For installation of the connector onto the coaxial cable refer to the figure
below.
1/16''
3/4''
1 1/8''
Adapter
3/4''
1/8''
5/8''3/8''
To get your coax cable through a fitting and into your boat’s interior, you
may have to cut off the end plug and reattach it later. You can do this if
you follow the directions that come with the connector. Be sure to make
good soldered connections.
GX1280SPage 8
1 GENERAL INFORMATION
1.1 INTRODUCTION
The STANDARD HORIZON MATRIX is a VHF/FM transceiver designed for
use in the frequency range of 156.025 to 163.275 MHz. The MATRIX can be
operated from 11 to 16 VDC and has a switchable RF output power of 1 watt
or 25 watts.
The MATRIX is capable of RTCM SC101 DSC (Digital Selective Calling)
operation and second station operation with the use of the improved optional RAM+ mic (CMP25 remote-control speaker/microphone with display).
The MATRIX operates on all currently-allocated marine channels which are
switchable for use with USA, International, or Canadian regulations. It has
an emergency channel 16 which can be immediately selected from any channel by pressing the red [16/9] key. NOAA Weather channels can also be
accessed immediately by pressing the [WX] key with channel selection.
Other features of the transceiver include: scanning, priority scanning, submersible speaker mic, high and low voltage warning, and GPS repeatability.
1.2 FCC / INDUSTRY CANADA INFORMATION
The following data pertaining to the transceiver is necessary to fill out the
license application.
Type Acceptance ....................................................................... FCC Part 80
Output Power ............................................. 1 Watt (low) and 25 Watts (high)
Emission .......................................................................16K0G3E, 16K0G2B
Frequency Range .................................................. 156.025 to 163.275 MHz
FCC Type Number .................................................................. K66GX1280S
Industry Canada Type Approval ........................................ 511B-GX1280S V
GX1280S Page 9
2 PACKING LIST
When the package containing the transceiver is first opened, please check
it for the following contents:
GX1280S MATRIX Transceiver (White/Black)
Mounting Bracket and attaching hardware
Owner’s Manual
Quick-Reference Card
Power Cord
Dust Cover
3 OPTIONS
MMB-84 ........................................................................ Flush-Mount Bracket
CMP25B/W ............ Remote-Access Microphone (RAM+ Mic, Black/White)
CT-100 ............................................. 10-foot Extension Cable for RAM+ Mic
CVS2500 ............................................................................. Voice Scrambler
101S ........................................................................ Mini Extension Speaker
201S ..................................................................... White Extension Speaker
201SZ .............................................. White Flush Mount Extension Speaker
201SBK.................................................................. Black Extension Speaker
201SBKZ ......................................... Black Flush Mount Extension Speaker
GX1280SPage 10
4 INSTALLATION
4.1 LOCATION
The radio can be mounted at any angle. Choose a mounting location that:
• is far enough from any compass to avoid any deviation in compass
reading due to the speaker magnet
• provides accessibility to the front panel controls
• allows connection to a power source and an antenna
• has nearby space for installation of a microphone hanger
• the antenna must be mounted at least 3 feet from radio
Note: To insure the radio does not affect the compass or radios performance
is not affected by the antenna location, temporarily connect the radio in the
desired location and:
a.Examine the compass to see if the radio causes any deviation
b.Connect the antenna and key the radio. Check to ensure the radio is
operating correctly by requesting a radio check.
4.2 ELECTRICAL CONNECTIONS
CAUTION
Reverse polarity connections will damage the radio!
Connect the power cord and antenna to the radio. Antenna and Power Supply connections are as follows (see Figure 1):
Antenna
Red
Power Source
Water proof
Deck Outlet
Black
Fuse
Optional Speaker
Accessory Cable
GPS Navigation Receiver
Figure 1. General Installation
1. Mount the antenna at least 3 feet away from the radio. At the rear of the
radio, connect the antenna cable. It must have a PL259 connector. RG8/U coaxial cable must be used if the antenna is 25 feet or more from the
GX1280S Page 11
radio. RG58 cable can be used for distances less than 25 feet.
2. Connect the red power wire to a 13.8 VDC ±20% power source. Connect
the black power wire to a negative ground.
3. If an optional remote extension speaker is to be used, refer to section
3.3 for connections.
4. It is advisable to have a Certified Marine Technician check the power
output and the standing wave ratio of the antenna after installation.
4.3 ACCESSORY CABLE
White: External speaker (+)
Shield: External speaker (–)
Blue: NMEA IN (+) from GPS navigation receiver
Green: NMEA IN (–) from GPS navigation receiver
Gray: NMEA OUT (+) to GPS navigation receiver
Brown: Test port (for the Service Technician)
When connecting the external speaker or GPS navigation receiver, strip off
about 1 inch (2.5 cm) of the specified wire’s insulation, then splice the ends
together.
Gray
Green
Blue
Shield
White
Blue
Green
Brown
MATRIX
16/9
U.I.C
WX
SCAN
DW
NAV
MENU
CALL
H/L
SET
VOL/PWR
ICMEM
DISTRESS
PULL OPEN
SQL
Wire Color/Description
WHITE - External Speaker (+
SHILED - External Speaker
GREEN - NMEA Ground
BLUE- NMEA Input (+)
GRAY-NMEA Output (+)
Connection Examples
)
Connect to external 4 Ohm audio speaker
(–)
Connect to external 4 Ohm audio speaker
Connect to NMEA
(–)
connection of GPS
Connect to NMEA (+) output of GPS
Connect to NMEA (+) input of GPS
External Speaker
GX1280SPage 12
4.4 CONNECTION OF GPS WITH NMEA OUTPUT
Manufacturer/Model
STANDARD HORIZON
CP150, CP160 and
CP-170C
Furuno GP30, 36
Furuno GP1650, 1850
Garmin Fixed Mounts
Garmin Portables
JRC GPS500
JRC 100 SERIES
JRC 200 SERIES
Lowrance Fixed Mount
Wires
Green
Brown
White
Blue
White
Black
Blue
Black (GND)
Brown
Black (GND)
Yellow
Green
Green
Black
White
Black
White
Black (GND)
MATRIX
Green
Blue
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Manufacturer/Model
Lowrance Portable
Magellan Fixed Mount
Magellan Portable
Northstar
Raytheon 420
Raytheon 520 / 620
Raytheon RL SERIES
Simrad
Sitex Neptune, Nautilus
Additional Information:
• The GPS must have the NMEA Output turned on and set to 4800 Baud
in the setup menu. If there is a selection for parity select none.
• For further information on interfacing /setting up your GPS. Please contact the manufacturer of the GPS receiver.
• MATRIX can read NMEA-0183 version 2.0 or higher.
• The NMEA supported sentences are:
• GLL, GGA, RMC and GNS (RMC sentence is recommended)
Wires
Orange
Black (GND)
Gray
Black (GND)
Orange
Black (GND)
Yellow
Black (GND)
Yellow
Brown
Blue
Brown
White
Brown
White
Brown
Gray
Brown
MATRIX
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
Blue
Green
If you have further inquires, please feel free to contact Product Support at:
Phone: (800) 767-2450
Email:
marinetech@vxstdusa.com
GX1280S Page 13
4.5 CHECKING GPS CONNECTIONS
After connections have been made between the MATRIX and the GPS, a
small satellite icon will appear on the top right corner of the LCD display. To
see additional GPS information press and hold the [H/L] (NAV) key until the
MATRIX shows the Date, Time, SOG and COG.
4.6 CHANGING THE GPS TIME
From the Factory the MATRIX shows GPS satellite time or UTC time. A time
offset is needed to offset this time to show the local time in your area.
1. Press and hold down the [CALL/SET] key until
“RADIO SETUP” menu appears.
2. Press the [CALL/SET] key, then select “TIME SET”
with the CHANNEL selector knob.
3. Press the [CALL/SET] key.
4. Turn the CHANNEL selector knob to select time
offset from UTC. See illustration below to find your
offset time from UTC. If “0:00” is assigned, the time
is the same as UTC (Universal Time Coordinated
or GMT Greenwich Mean Time).
5. Press the [CALL/SET] key to store the time offset.
6. Press the [16/9] key or turn the CHANNEL selector knob to select “EXIT,”
then press the [CALL/SET] key to return to the “RADIO SETUP” menu,
select “EXIT” and press the [CALL/SET] key to return to radio operation.
OFFSET TIME TABLE
GX1280SPage 14
4.7 CHANGING COG TO TRUE OR MAGNETIC
Allows customizing the NAV data showing GPS Course Over Ground (COG).
Factory default is True however following the steps below the COG can be
changed to Magnetic.
1. Press and hold down the [CALL/SET] key until
“RADIO SETUP” menu appears.
2. Press the [CALL/SET] key, then select “TRUE
MAG” in the “RADIO SETUP” menu with the
CHANNEL selector knob.
3. Press the [CALL/SET] key.
4. Turn the CHANNEL selector knob to select “MAGNETIC” or “TRUE.”
5. Press the [CALL/SET] key to store the selected
setting.
6. Turn the CHANNEL selector knob to select “EXIT,”
then press the [CALL/SET] key to return to the “RADIO SETUP” menu,
select “EXIT” and press the [CALL/SET] key to return to radio operation.
GX1280S Page 15
4.8 OPTIONAL MMB-84 FLUSH MOUNT INSTALLATION
1. Make a rectangular template for the flush mount measuring 2-5/8” H x
6-5/8” W.
2. Use the template to mark the location where the rectangular hole is to be
cut. Confirm the space behind the dash or panel is deep enough to accommodate the transceiver (at least 6 inches deep).
There should be at least 1/2 inch between the transceiver’s heatsink and
any wiring, cables or structures.
3. Cut out the rectangular hole and insert the transceiver.
4. Fasten the brackets to the sides of the transceiver with the lock washer
nut combination; so that the mounting screw base faces the mounting
surface (see Figure 2).
5. Turn the adjusting screw to adjust the tension so that the transceiver is
tight against the mounting surface.
Bracket
Adjusting Screw
Lock-washer nut combination
Figure 2. MMB-84 Flush Mount Instllation
GX1280SPage 16
4.9 OPTIONAL CMP25 RAM+ MIC INSTALLATION
1. Connect the RAM+ MIC Cable to the RAM MIC CONNECTOR on the
rear panel, then tighten the Cable Nut (See Figure 3).
2. Referring to Figure 3, make a 1.2” (30 mm) hole in the wall, then insert
the RAM+ MIC Cable into this hole. Connect the Gasket and Mount Base
to the RAM+ MIC Cable Connector using the Nut.
3. Drill the four Screw holes (approx. 2 mm) on the wall, then install the
Mounting Base to the wall using four screws.
4. Put the Rubber Cap on to the Nut. The installation is now completed.
Wall
RAM MIC Cable
Mounting Bracket
Gasket
Cap
Nut
Figure 3. CMP25 RAM+ MIC Instllation
GX1280S Page 17
5 CONTROLS AND INDICATORS
NOTE
This section defines each control of the transceiver. See Figure 4 for
location of controls. For detailed operating instructions refer to chapter
6 of this manual.
5.1 CONTROLS AND CONNECTIONS
POWER SWITCH/VOLUME CONTROL
Turns the transceiver on and off as well as adjusts the audio volume. To
turn the transceiver on press and hold this knob until the LCD turns on.
To turn it off, press and hold this knob until the LCD turns off. When the
power is turned on, the transceiver is set to the last selected channel.
Secondary Use
When the transceiver is turned on while the [SCAN] and [WX] keys are
held down, the internal microprocessor is reset. This clears the memory
and all user-programmed settings, such as scan memory, and priority
scan assignments. This condition is known as the default condition, the
same as when shipped from the factory. For a list of these defaults, see
the section 6.18 Resetting the Transceiver’s Microprocessor.
NOTE
Resetting the microprocess will not erase the DSC MMSI and the
Individual Directory Call information.
SQUELCH CONTROL (SQL
Adjusting this control clockwise, sets the point at which random noise on
the channel does not activate the audio circuits but a received signal
does. This point is called the squelch threshold. Further adjustment of
the squelch control will degrade reception of wanted transmissions.
CHANNEL SELECTOR KNOB
Rotary knob used to select channels and to choose menu items (such
as the DSC menu, radio setup and DSC setup menu). The [UP()] /
[
DOWN()] key on the microphone can also be used to select channels
and menu items.
Secondary Use
While holding down the [SCAN] Key and turning the CHANNEL selector
knob, you can confirm memory channels for scanning.
)
GX1280SPage 18
MATRIX
16/9
VOL/PWR
U.I.C
WX
SCAN
H/L
ICMEM
DW
DISTRESS
MENU
NAV
CALL
SET
PULL OPEN
SQL
Figure 4. Controls and Connectors
GX1280S Page 19
KEYPAD
[
16/9] Key
Immediately recalls channel 16 from any channel location. Holding down
this key recalls channel 9. Pressing the [16/9] key again reverts to the
previous selected working channel.
Secondary use
Press and hold the [16/9] key then press the [WX] key to switch between
USA, International and Canadian bands.
[WX]
Key
Immediately recalls the previously selected NOAA weather channel from
any channel.
Secondary use
1. Holding down the [16/9] key while pressing the [WX] key changes
the mode from USA to International or Canadian.
2. Holding down the [WX] and [SCAN] key while turning the power on
resets the microprocessor and erases scan channels from memory.
This clears the memory and establishes the factory-set defaults. For
a list of these defaults, see the section on 6.19 Resetting the
Transceiver’s Microprocessor.
[
SCAN] / [MEM]Key
1. Starts and stops scanning of programmed channels.
2. If held while the [UP()] or [DOWN()] key on the microphone are
pressed or CHANNEL selector knob on radio is turned, the radio will
show the channels programmed in scan memory. This function will
not work if the unit is scanning.
NOTE: The priority channel is channel 16 only.
3. Pressing and holding again will delete the channel from scan memory.
[
H/L] / [NAV] Key
Toggles between 25 W (High) and 1 W (Low) power. When the [H/L] key is
pressed while the transceiver is on channel 13 or 67, the power will temporarily switch from LO to HI power until the PTT is released. The [H/L] key
does not function on transmit inhibited and low power only channels.
Secondary use
Press and hold [H/L] key, the LCD displays NAV GPS Data, Time, SOG
(Speed Over Ground), and COG (Course Over Ground) when a GPS is
connected to the accessory cable of the MATRIX. See section 4.4 CON-
NECTION OF GPS WITH NMEA OUTPUT.
GX1280SPage 20
[DW] / [IC]
Key
Scans for voice communications on CH16 and another selected channel until a signal is received on either channel. (Dual watch)
NOTE: When the DSC SCANNING feature is enabled (see section 7.2
DSC SCAN), the radio watches for a transmission on CH16, another
selected channel, and CH70 until a signal is received (Triple watch).
Secondary use
Press and hold [DW] key, when the optional RAM+ Mic is connected,
intercom operation will operate between radio and RAM+ Mic.
[
CALL/SET] / [MENU] Key
The [CALL/SET] key functions as the enter key.
Secondary use
Press the [CALL/SET] key to access the DSC OPERATION menu. The
“INDIVIDUAL CALL,” “GROUP CALL,” “ALL SHIPS CALL,” “POSITION
REQUEST,” “POSITION SEND,” “STANDBY MODE,” and “CALL WAITING” functions can be accessed from the DSC OPERATION menu.
Press and hold the [CALL/SET] key to access the RADIO SETUP or
DSC SETUP menu. The following functions can be accessed in the menu
(refer to Section7).
RADIO SETUP-menu DSC SETUP-menu
[
DISTRESS] Key
Used to send a DSC Distress Call. To send the distress call refer to
section 7.5.1 (Transmitting A DSC Distress Call).
RAM MIC CONNECTOR
Connects the MATRIX to the enhanced RAM+ MIC (Remote Access Mi-
crophone). Refer to section 9 RAM+ MIC OPERATION.
GX1280S Page 21
ACCESSORY CONNECTION CABLE
Connects the MATRIX to a GPS, and an external speaker. See section 3
OPTIONS for a list of speakers STANDARD HORIZON offers.
DC INPUT CABLE
Connects the radio to a DC power supply capable of delivering 12V DC.
ANTENNA JACK
Connects an antenna to the transceiver. Use a marine VHF antenna with
an impedance of 50 ohms.
PTT (Push-To-Talk) SWITCH
Keys the transmitter when the transceiver is in radio mode. If the transceiver is in the intercom operation mode (between the RAM+ and the
MATRIX), it activates the MATRIX microphone for voice communications.
MICROPHONE
Transmits the voice message with reduction of background noise.
MICROPHONE SPEAKER
The same audio heard through internal radio speaker is heard through
microphone speaker.
[UP()]
/ [DOWN()] KEYS
The [UP()] and [DOWN()] on the microphone function the same as
the CHANNEL selector knob on the front panel of the transceiver.
[
16/9] Key
Pressing the [16/9] key immediately recalls channel 16 from any location. Press and hold the [16/9] key to recall channel 9. Pressing the
[
16/9] key again will revert the radio to the previous selected channel.
GX1280SPage 22
6 BASIC OPERATION
6.1 RECEPTION
1. After the transceiver has been installed, ensure that the power supply
and antenna are properly connected.
2. Press and hold the VOL/PWR knob until the radio turns on.
3. Turn the SQL knob fully counterclockwise. This state is known as “squelch
off”.
4. Turn up the VOL/PWR knob until noise or audio from the speaker is at a
comfortable level.
5. Turn the SQL knob clockwise until the random noise disappears. This
state is known as the “squelch threshold.”
6. Turn the CHANNEL selector knob to select the desired channel. Refer
to the channel chart on page 62 for available channels.
7. When a message is received, adjust the volume to the desired listening
level. The “BUSY” indicator in the LCD is displayed indicating that the
channel is being used.
6.2 TRANSMISSION
1. Perform steps 1 through 6 of RECEPTION.
2. Before transmitting, monitor the channel to ensure it is clear.
THIS IS AN FCC REQUIREMENT!
3. Press the PTT (push-to-talk) switch. The “TX” indicator on the LCD is
displayed.
4. Speak slowly and clearly into the microphone.
5. When the transmission is finished, release the PTT switch.
NOTE
This is a noise-canceling microphone. The oval slot on the bottom of
microphone should be positioned within 1 inch (2.5 cm) from the mouth
for optimum performance.
6.3 TRANSMIT TIME - OUT TIMER (TOT)
When the PTT switch on the microphone is held down, transmit time is limited
to 5 minutes. This limits unintentional transmissions due to a stuck microphone. About 10 seconds before automatic transmitter shutdown, a warning
beep will be heard from the speaker(s). The transceiver will automatically go
to receive mode, even if the PTT switch is continually held down. Before transmitting again, the PTT switch must first be released and then pressed again.
GX1280S Page 23
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