Standard Horizon Marine Tranciever GX1280S Operating Instructions

GX1280SPage 41
7.8  ADVANCED DSC CALLS
7.8.1  Group Call
This feature allows the user to contact a group of specific vessels (example
members of a yacht club) using DSC radios with Group call function to auto-
matically switch to a desired channel for voice communications.
7.8.1.1 Setup a Group Call
For this function to operate the same Group MMSI must be programmed
into all the DSC VHF radios within the group of vessels that will be using this
feature. The group MMSI is a 9 digit (first digit...

GX1280SPage 42
10. Turn the CHANNEL selector knob to scroll through
numbers, 0-9.
11. To enter the desired number and move one space
to the right press the [
CALL/SET]
 key. Repeat pro-
cedure until all nine spaces of MMSI number are
entered.
12. If a mistake was made entering in the name or the
MMSI number repeat pressing the [
CALL/SET]
 key until the wrong char-
acter is selected, then move the CHANNEL selector knob to correct the
entry.
13. To store the data entered, press and hold the [
CALL/SET]...

GX1280SPage 43
7.8.1.3 Receiving a Group Call
1. When a group call is received, the MATRIX will produce a ringing alarm
sound.
2. The radio automatically switches to the requested channel.
3. Press any key to stop the alarm.
4. Monitor the channel for the person calling the Group for a message.
5. If you want to respond, monitor the channel to make sure it is clear, then
press the PTT on the mic and talk to the calling ship(s).
NOTE
After a Group call is received, the time the call was made and the...

GX1280SPage 44
7.8.2.1 Setting up Position Reply
The MATRIX can be set up to automatically or manually send your position
to another vessel. This selection is important if you are concerned about
someone polling the position of your vessel that you may not want to. In the
manual mode you will see the MMSI or persons name shown on the display
allowing you to choose to send your position to the requesting vessel.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appear.
2. Turn the...

GX1280SPage 45
5. Press the [
CALL/SET]
 key to transmit the posi-
tion request DSC call.
6. After a DSC position request is transmitted, the
transceiver remains on channel 70 until position
data is received from the polled vessel.
7. When the MATRIX receives the position from the
polled vessel it is shown on the radio display and
also transferred to the GPS Chart plotter.
8. If the MATRIX does not receive a reply, the LCD
will display “SEND” to prompt the user to send
the call again or exit the mode....

GX1280SPage 46
4. When “REPLY” is selected, press the [
CALL/SET]
 key. And the your
position will be transmitted to the requesting vessel.
5. To exit from position request display, press any key.
7.8.3  Position Send
The feature is similar to Position Request, however instead of requesting a
position of another vessel this function allows you to send your position to
another vessel. Your vessel must have an operating GPS receiver connected
for the MATRIX to send the position.
NOTE
To transmit a Position...

GX1280SPage 47
7.8.3.2 Receiving a DSC Position Send Call
When another vessel transmits their vessels location to the MATRIX the
following will happen:
1. A ringing sound will be produced when the call is received.
2. Press the [
16/9]
 key to stop ringing
3. The position from the vessel sending it's position will be shown on the
display of the radio and also transferred to any Standard Horizon GPS
Chart plotter if connected. 

GX1280SPage 48
8  RADIO SETUP
NOTE
The optional RAM+ MIC CMP25 can be also change the SETUP menu.
Refer to page 54 for details.
8.1  LAMP ADJUSTING
Allows setting up the backlight intensity or to turn it off.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “LAMP” in
the “RADIO SETUP” menu with the CHANNEL se-
lector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select the
desired level. When “OFF” is...

GX1280SPage 49
8.3  TIME OFFSET
Sets the time offset between local time and UTC (time GPS sends to radio).
Time is displayed when GPS position (LAT/LON) is displayed by pressing
the [
H/L]
 key.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “TIME SET”
in the “RADIO SETUP” menu 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...

GX1280SPage 50
8.4  KEY BEEP (
ON/OFF)
This selection allows the beep tone when a key is pressed to be turned off.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key, then select “KEY
BEEP” in the “RADIO SETUP” menu with the
CHANNEL selector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select “ON”
or “OFF.”
5. Press the [
CALL/SET]
 key to set the key beep
condition.
6. To exit this menu and return to radio operation...