Standard Horizon Marine Tranciever GX1250SA Operating Instructions

GX1250SA Owner’s Manual page 9
yDC INPUT CABLE
Connects the transceiver to a DC power supply of 13.8V ± 20 %.
u PTT (Push-To-Talk) SWITCH
Keys the transmitter when the transceiver is in radio mode. If the
transceiver is in the intercom operation mode, it activates the
microphone for the intercom.
i Submersible MIC
This microphones water-resistant is equivalent to JIS Class 7th.
o UP  and DOWN  KEYS
The UP  and DOWN  on the mic function the same as the The UP 
and DOWN  keys on the front panel of the...

page 10Owner’s Manual GX1250SA
3.2 INDICATORS
The LCD on the transceiver has several symbols and indicators that
should be understood by the user before operating the unit. Figure 2
shows all of these symbols and indicators, although it is not possible to
see them at the same time.
U/I/C Indicator
Indicates the mode of operation (USA, International or Canadian) for a
particular channel.
WX Indicator
Indicates a weather channel.
TX Indicator
Transmission indicator. The TX indicator appears when th PTT...

GX1250SA Owner’s Manual page 11
7-SEGMENT Display
Displays the channel number in use.
HI/LO Indicator
Indicates the power setting. “HI” 25 watts and “LO” 1 watt. This display
is blank if a transmission-inhibited channel is selected. 

page 12Owner’s Manual GX1250SA
4 INSTALLATION
4.1 FREQUENCY AND DEVIATION TESTS
FCC regulations require that the transceiver’s deviation and frequency be
tested before initial installation or operation. This test should be performed
by a Certified Marine Technician.
4.2 LOCATION
1. The transceiver can be mounted at any angle. Choose a mounting
location that:
• is far enough from any compass to avoid erroneous compass
reading due to the speaker magnet
• provides protection from sea spray and rain
•...

GX1250SA Owner’s Manual page 13
a. At the rear of the transceiver, connect the antenna cable to the
antenna jack. The antenna must have a PL259 connector. RG8 or
RG213 coaxial cable must be used if the antenna is 25 feet or
more from the transceiver. RG58 cable can be used for distances
less than 25 feet.
b. Connect the red power cord to a 13.8 VDC ± 20 % power source.
Connect the black power cord to negative ground. See Figure 3 for
this step .
c. It is advisable to have a Certified Marine Technician...

page 14Owner’s Manual GX1250SA
4.4 CMB16 FLUSH MOUNT INSTALLATION
1. Make a rectangular template for the flush mount measuring 2
inches (50 mm) H x 5 3/8 inches (135 mm) 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 accommodate 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...

GX1250SA Owner’s Manual page 15
5  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 until the transceiver turns on.
3. Turn the SQL knob fully counterclockwise. This state is known as
“squelch off”.
4. Turn up the volume 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...

page 16Owner’s Manual GX1250SA
5.3 TRANSMIT TIME - OUT TIMER (TOT)
When the PTT switch on the microphone is held down, transmit time is
limited to 5 minutes. This prevents unintentional transmissions.  About 10
seconds before automatic transmitter shutdown, a warning beep will be
heard from the speaker(s). The transceiver will automatically go to receive
mode, even if the PTT switch is continually held down.  Before transmitting
again, the PTT switch must first be released and then pressed again.
5.4...

GX1250SA Owner’s Manual page 17
5.6 NOAA WEATHER CHANNELS
1. To receive a NOAA weather channel, press the WX key from any
channel. The transceiver will go to the last selected weather
channel.
2. Press the UP 
 or DOWN   key to select a different NOAA weather
channel.
3. To exit from the NOAA weather channels, press the WX key. The
transceiver returns to the channel it was on prior to a weather
channel.
5.7 NOAA WEATHER ALERT
In the event of extreme weather disturbances, such as storms and
hurricanes,...

page 18Owner’s Manual GX1250SA
5.8 MEMORY SCANNING
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 down the SCAN key until MEM appears on the
LCD which programs the channel into the transceivers memory.
3. Repeat step 2 for all the desired channels to be scanned.
4. To DELETE a channel from the transceiver’s memory, select a
channel to be erased with the UP 
 or DOWN   key. Press and hold
down the SCAN key...