Standard Horizon Marine Tranciever GX1280S Operating Instructions

GX1280SPage 21
[
DW] 
/ [
IC]
 Key
Scans for voice communications on CH16 and another selected chan-
nel 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.
[...

GX1280SPage 22
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 trans-
ceiver is in the intercom operation mode (between...

GX1280SPage 23
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...

GX1280SPage 24
6.4  SIMPLEX/DUPLEX CHANNEL USE
Refer to the VHF MARINE CHANNEL CHART (page 63) for instructions on
use of simplex and duplex channels.
NOTE
All channels are factory-programmed in accordance with FCC (USA),
Industry Canada (Canada), and International regulations. Mode of op-
eration cannot be altered from simplex to duplex or vice-versa.
6.5  USA, CANADA, AND INTERNATIONAL MODE
1. To change the modes, hold the [
16/9]
 key and press the [
WX]
 key. The
mode changes from USA to...

GX1280SPage 25
6.7  NOAA WEATHER ALERT
In the event of extreme weather disturbances, such as storms and hurri-
canes, the NOAA (National Oceanic and Atmospheric Administration) sends
a weather alert accompanied by a 1050 Hz tone and subsequent weather
report on one of the NOAA weather channels. When the Weather Alert fea-
ture is enabled (see section 8.5 WX ALERT), the transceiver is capable of
receiving this alert if the following is performed:
1. Program NOAA weather channels into the transceiver’s...

GX1280SPage 26
6.9  EMERGENCY (CHANNEL 16 USE)
Channel 16 is known as the Hail and Distress Channel. An emergency may
be defined as a threat to life or property. In such instances, be sure the
transceiver is on and set to CHANNEL 16. Then use the following procedure:
1. Press the microphone push-to-talk switch and say “Mayday, Mayday,
Mayday. This is 
      ,       ,       ” (your vessel’s name).
2. Then repeat once: “Mayday, 
      ” (your vessel’s name).
3. Now report your position in...

GX1280SPage 27
some of the channels available to non-commercial (recreational) boaters.
Monitor your desired channel in advance to make sure you will not be inter-
rupting other traffic, and then go back to either channel 16 or 9 for your initial
contact.
When the hailing channel (16 or 9) is clear, state the name of the other
vessel you wish to call and then “this is” followed by the name of your
vessel and your Station License (Call Sign). When the other vessel returns
your call, immediately request...

GX1280SPage 28
By regulation, power is normally limited to 1 Watt on these channels. Your
radio is programmed to automatically reduce power to this limit on these
channels. However, in certain situations it may be necessary to temporarily
use a higher power. See page 20 (H/L key) for means to temporarily over-
ride the low-power limit on these two channels.
6.13  PROHIBITED COMMUNICATIONS
The FCC prohibits the following communications:
• False distress or emergency messages:
• Messages to “any boat”...

GX1280SPage 29
5. To start scanning, press the [
SCAN]
 key. Scan-
ning will proceed from the lowest to the highest
programmed channel number and will stop on a
channel when a transmission is received.
6. The channel number will blink during reception.
7. To stop scanning, press the [
SCAN]
, [
16/9]
, [
WX]
, [
CALL/SET]
, or PTT
key.
6.16  PRIORITY SCANNING (
P-SCAN)
1. Channel 16 is set as the priority channel and cannot be changed.
2. To select priority scanning, press the [
SCAN]
 key
to start...

GX1280SPage 30
6.18  VOICE SCRAMBLER
If privacy of communications is desired, a CVS2500 voice scrambler (VS)
can be installed in the transceiver. Contact your Dealer to have a CVS2500
installed. Refer to the section 8.9 VOICE SCRAMBLER to program the voice
scrambler.
1. Turn on the transceiver.
2. Select a channel that was programmed for scram-
bler mode (“VS” will appear on the LCD).

If a channel is not set for the voice scrambler,
the display will be as shown in the illustration at
the right (“VS”...