Standard Horizon Marine Tranciever GX1255S Operating Instructions

GX1255S3.4  OPTIONAL CMB16 FLUSH MOUNT INSTALLATION
1.Make a rectangular template for the flush mount measuring 2” H x
5-5/16” 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.
4.Fasten the...

GX1255SPage 104  CONTROLS AND INDICATORS
NOTE
This section defines each control of the transceiver. See Figure 3 for
location of controls. For detailed operating instructions refer to chapter
5 of this manual.
4.1  CONTROLS AND CONNECTIONSPOWER SWITCH/VOLUME CONTROL
Turns the transceiver on and off as well as adjusts the audio volume.
Turn this control clockwise to turn the radio on and to increase the vol-
ume.
Turn fully counterclockwise to turn the radio off.
Secondary Use
When the transceiver is...

GX1255SFigure 3. Controls and ConnectorsPage 11 

GX1255SPage 12WX 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.
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...

GX1255SCALL/SET 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 and ALL SHIPS CALLS functions can be accessed from
the DSC OPERATION menu.
Press and hold the CALL/SET key to access the RADIO or DSC setup
menu. The following functions can be accessed in the menu.
DISTRESS Key
Used to send a DSC Distress Call. To send the distress call see section
6.2 (Sending a Distress Call).
UP and DOWN Keys
The UP and DOWN keys are...

GX1255SPage 14ACCESSORY CONNECTION CABLE
Connects the radio to a GPS, and an external speaker.DC INPUT CABLE
Connects the radio to a DC power supply of 13.8VANTENNA 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.MICROPHONE
Transmits the voice message with reduction of background noise.UP(p) and DOWN(q) KEYS
The UP(p) and DOWN(q) on the microphone function the same as the
UP and DOWN key on the front panel...

GX1255S5  BASIC OPERATION
5.1  RECEPTION
1.After the transceiver has been installed, ensure that the power supply
and antenna are properly connected.
2.Turn the VOL/PWR knob clockwise to turn on the radio.
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.Press the UP...

GX1255SPage 16 5.4  SIMPLEX/DUPLEX CHANNEL USE
Refer to the VHF MARINE CHANNEL CHART (page 49) 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.
5.5  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 International to...

GX1255S5.7  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 Weater Aleart fea-
ture is enabled (see section 7.4 WEATER ALERT), the transceiver is ca-
pable of receiving this alert if the following is performed:
1.Program NOAA weather channels into the transceiver’s memory...

GX1255SPage 185.8  MEMORY SCANNING (M-SCAN)
NOTE
•During scanning, the dot matrix area of the LCD will show M-SCAN or
P-SCAN depending on the scan mode selected.
•If GPS position is displayed this icon will be hidden.
1.Adjust the SQL knob until background noise disappears.
2.Select a desired channel to be scanned using the UP or DOWN key.
Press and hold the SCAN key, MEM will appear on the
LCD which indicates the channel has been programmed
into the transceivers memory.
3.Repeat step 2 for all the...