Standard Horizon Marine Tranciever GX1280S Operating Instructions

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8.6  VOICE SCRAMBLER
(Operates only when the optional CVS2500 is installed)
This menu is used to setup the channels to be scrambled and the scrambler
code.
NOTE
This menu will not appear unless a CVS2500 is installed.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appears.
2. Press the [
CALL/SET]
 key then select “SCRAM-
BLER” in the “RADIO SETUP” menu with the
CHANNEL selector knob.
3. Press the [
CALL/SET]
 key then select “CODE” in
the “SCRAMBLER” menu with the CHANNEL se-
lector knob.
4 Press the [
CALL/SET]
 key then turn the CHAN-
NEL selector knob to change the scrambler code.
The scrambler code can be set from “0” to “3” and
“OFF.” When “OFF” is selected the voice scram-
bler is disabled.
5. Press the [
CALL/SET]
 key to store the selected
code.
6. Select “CHANNEL” in the “SCRAMBLER” menu
with the CHANNEL selector knob, then press the
[
CALL/SET]
 key.
7. Turn the CHANNEL selector knob to change the
Scrambler channel.
8. Press the [
SCAN]
 key to store the selected chan-
nel. Repeat steps 6 and 7 to set other channels.
9. Press the [
CALL/SET]
 key to return to the “SCRAMBLER” menu.
10. To exit this menu and return to radio operation mode press the [
16/9]
key. 
						

							GX1280SPage 52
8.7  CHANNEL NAMING
This selection allows you to customize the name of a channel from the de-
fault name.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appear.
2. Press the [
CALL/SET]
 key, then select “CH NAME”
in the “RADIO SETUP” menu with the CHANNEL
selector knob.
3. Press the [
CALL/SET]
 key.
4. Turn the CHANNEL selector knob to select the
channel to be named and press the [
CALL/SET]
key.
5. Turn the CHANNEL selector knob scroll through
the alphabet and 0 - 9.
6. Press the [
CALL/SET]
 key to enter the desired
letter and move the cursor one space to the right.
7. Repeat procedure until the name is complete. The
name can consist of up to twelve characters. If
you do not use all twelve character, press the
[
CALL/SET]
 key to move to the next space. To
clear the previous letter, press the [
H/L]
 key.
8. Press and hold down the [
CALL/SET]
 key to enter the name and exit
from the “CH NAME” menu. The LCD will return to the “SETUP” menu.
9. If you want to enter the name of another channel, repeat steps 3 through
8.
10. To exit this menu and return to radio operation mode press the [
16/9]
key. 
						

							GX1280SPage 53
8.8  TRUE MAGNETIC CHANGE (
NAV display)
Allows customizing the GPS COG (Course Over Ground) displayed on the
LCD to be in True or Magnetic.
1. Press and hold down the [
CALL/SET]
 key until
“RADIO SETUP” menu appear.
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. Press the [
CALL/SET]
 key to store the selected
setting.
6. To exit this menu and return to radio operation
mode press the [
16/9]
 key. 
						

							GX1280SPage 54
9  RAM+ MIC OPERATION
If the enhanced optional RAM+ Mic (CMP25) is connected to the remote
microphone connector on the transceiver’s rear panel, the transceiver can
use the remote control operation except for a few functions. The RAM+ Mic
supplied with 23 feet (7 m) of routing cable and can be extended up to 70
feet (21 m) using three 23 feet extension cables model CT-100. The inter-
com operation can be used between the RAM+ Mic and the transceiver.
9.1  RAM+ MIC CONTROLS
SQUELCH CONTROL (
SQL)
Activates the squelch adjusting mode.
Press this key to activate the squelch adjusting mode. Press the
microphone’s [

]
 or [
]
 key to adjust the squelch.
When this key is pressed and held down for 1 second or more, the squelch
is turned off.
SCAN DW
NAVWX
CALL
SETMEM IC
U.I.C
ME
N
U16
9 
						

							GX1280SPage 55
VOLUME KEY (
VOL)
Activates the volume adjusting mode.
Press this key to activate the volume adjusting mode. Press the
microphone’s [

]
 or [
]
 to adjust the volume.
POWER SWITCH (
PWR)
Press and hold down this key to turn to the transceiver and RAM+ Mic on
and off.
PTT (
Push-To-Talk)
 SWITCH
Activates transmission.
[
H/L]
 KEY
Toggles between high and 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.
[

](
UP)
/[
](
DOWN)
 KEY
These keys are used to select channels, adjusts the volume and squelch
level, and to choose the item selection of different functions (such as the
DSC operation). In many ways, these keys emulate the function of the
transceiver’s CHANNEL selector knob.
[
16/9]
 KEY
Immediately recalls channel 16 from any channel location. Holding down
this key recalls channel 9. Pressing the [
16/9]
 key reverts to the previous
selected working channel.
Secondary use
Please see secondary use for the [
WX]
 and [
MEM]
 key.
KEY PAD
[
SCAN]
 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. 
						

							GX1280SPage 56
[
CALL/SET]
 Key
The [
CALL/SET]
 key functions as the enter key.
Secondary use
Press the [
CALL/SET]
 key to access the DSC OPERATION menu.
Press and hold the [
CALL/SET]
 key to access the SETUP menu.
[
DW]
 Key
Watches for a transmission on CH16 and another selected channel until
either signal is received. (Dual watch)
NOTE: When the DSC SCANNING feature is enabled (see section 7.15
DSC SCAN), the radio watches for a transmission on CH16, another
selected channel, and CH70 until either signal is received (Triple watch).
Secondary use
Press and hold [
DW]
 key, intercom operation will operate between radio
and RAM Mic.
[
NAV]
 Key
Press and hold this key, when connected to the GPS receiver, the LCD
displays Position Data, Time, SOG (Speed Over Ground), and COG
(Course Over Ground) from the GPS.
[
WX]
 Key
Immediately recalls the previously selected NOAA weather channel from
any channel location.
Secondary use
1. Holding down the [
16/9]
 key while pressing the [
WX]
 key changes
the mode from USA to International or Canadian.
NOTE: If position is displayed, this icon will be hidden.
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 Resetting the Transceiver’s
Microprocessor.
[
DISTRESS]
 KEY
Used to send a DSC Distress Call. To send the distress call:
1. Lift the red rubber cover.
2. Press and hold the Red button. The RAM+ display will
count down (3-2-1) and then transmit the Distress call.
3. When the distress signal is sent, Ch70 and “TX” icon 
						

							GX1280SPage 57
will appear on the LCD. After the message has been
sent, the radio will sound a Distress Alarm.
4. The transceiver “shadow-watches” for a transmission
on CH16 or CH70 until an acknowledgment signal is
received. “DISTRESS” and “WAITING” will appear on
the LCD.
5. If an acknowledgement is received, select channel 16
and advise your distress situation.
6. If no acknowledgment is received, the distress call is repeated in 4
minute intervals until an acknowledgment is received.
7. When a DSC Distress acknowledgment is received, a distress alarm
sounds and channel 16 is automatically selected. The LCD shows
the MMSI of the ship responding to your distress.
RECEIVED ACK:acknowledgment signal is received.
RECEIVED RLY:relay signal is received from another vessel or coast
station.
8. To cancel the DSC distress alarm signal from the speaker, press any
key.
9.2  INTERCOM OPERATION
9.2.1  Communication
1. Press and hold the [
DW]
 key while
in the “RADIO” mode, the mode is
changed to “INTERCOM” mode. If
press the [
DW]
 key again the mode
will revert to “RADIO” mode.
2. When the “INTERCOM” operation
is activated, “IC” is displayed on the
RAM+ Mic and “INTERCOM” is dis-
played on the MATRIX.
3. Press the PTT switch. The “TALK”
is displayed.
NOTE: A warning beep is emitted
when the RAM+ Mic PTT switch is
pressed while the transceiver microphone’s PTT switch is pressed.
4. Speak slowly and clearly into the microphone, hold the microphone about
1/2 inch away from your mouth.
5. When finished, release the PTT switch.
(
RAM+ Mic PTT switch is pressed)
(
MATRIX PTT switch is pressed) 
						

							GX1280SPage 58
9.2.2  Calling
Hold down the [
DW]
 key for 1 second or more, when the “INTERCOM” op-
eration is activated. A calling beep is emitted twice from the transceiver
speaker.
9.3  DSC/RADIO SETUP MODE
The  CMP25 can access the DSC / RADIO setup menu (refer to section 7
“DSC/RADIO SETUP” for details). However, the LAMP, CONTRAST, and
KEY BEEP menu item which is accessed from the CMP25 only controls the
CMP25’s display and speaker.
DSC/RADIO Setup mode from the CMP25:
1. Press and hold down the [
CALL/SET]
 key until “RADIO SETUP” menu
appears.
2. Press the [

]
/[
]
 key to select “RADIO SET” or “DSC SETUP” menu.
3. Press the [
CALL/SET]
 key, then select the menu item you wish to work
on by pressing the [

]
/[
]
 key.
4. Press the [
CALL/SET]
 key.
5. Press the [

]
/[
]
 key to change the value or condition for the menu
item, then press the [CALL/SET] key to save the new setting.
6. Press the [

]
/[
]
 key to select “EXIT,” then press the [
CALL/SET]
 key
to return to the normal operation.
RADIO SETUP-menu DSC SETUP-menu 
						

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10  MAINTENANCE
The inherent quality of the solid-state components used in this transceiver
will provide many years of continuous use. Taking the following precautions
will prevent damage to the transceiver.
• Keep the microphone connected or the jack covered at all times to pre-
vent corrosion of electrical contacts;
• Never key the microphone unless an antenna or suitable dummy load is
connected to the transceiver.
• Ensure that the supply voltage to the transceiver does not exceed 16
VDC or fall below 11 VDC.
• Use only STANDARD HORIZON-approved accessories and replacement
parts.
In the unlikely event of serious problems, please contact your Dealer or our
repair facility. Address and phone numbers for this facility, as well as war-
ranty information, are contained in section 12 WARRANTY.
10.1  REPLACEMENT PARTS
Occasionally an owner needs a replacement mounting bracket or knob.
These can be ordered from our Parts Department by writing or calling:
Marine Division of Vertex Standard
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
Telephone (714) 827-7600
Commonly requested parts, and their part numbers are listed below.
•Power Code: T9023306
•Dust Cover: RA516700
•VOL/SQL Knob Assy: RA0422200
•Rotary Channel Knob: RA0491800
•Mounting Bracket (White): RA0516800
•Mounting Bracket Knob (White): RA043770A
•Mounting Bracket (Black): RA0520100
•Mounting Bracket Knob (Black): RA045910A
•Microphone Hanger (White): RA0436000
•Microphone Hanger (Black): RA0458800 
						

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10.2  FACTORY SERVICE
In the unlikely event that the radio fails to perform or needs servicing,
please contact the following:
Standard Horizon
Attention Marine Repair Department
10900 Walker Street
Cypress, CA 90630
Telephone (800) 366-4566
An “RA” Return Authorization number is not necessary to send a product in
for service. Include a brief note describing the problem along with your name,
return address, phone number, and proof of purchase.