Standard Horizon Marine Tranciever GX1280S Operating Instructions

GX1280SPage 11
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...

GX1280SPage 12
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 (–)...

GX1280SPage 13
4.4  CONNECTION OF GPS WITH NMEA OUTPUT
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 con-
tact 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)
If you have further inquires, please...

GX1280SPage 14
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...

GX1280SPage 15
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 “MAG-
NETIC” or “TRUE.”
5....

GX1280SPage 16
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 ac-
commodate 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....

GX1280SPage 17
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...

GX1280SPage 18
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...

GX1280SPage 19
16/9
WX
SCAN
H/LCALL
SET
SQL VOL/PWR
DISTRESS
IC MEM U.I.C
MENU
PUL L OPENNAVDW
MATRIX
Figure 4. Controls and Connectors 

GX1280SPage 20
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 [...