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 transceiver.
!0 16/9 Key
Pressing the 16/9 key Immediately recalls channel 16 from any
location. Press and hold the 16/9 key to recall channel 9. 
						

							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 switch
is pressed and it is O.K. to transmit.
MEM Indicator
Indicates the channel is memorized in the transceiver’s memory.
A Indicator
Indicates a simplex channel in USA or  Canadian mode whose
counterpart in the International mode is a duplex channel.
A
HI
WXLO
TXUIC
Figure 2.  Indicators 
						

							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
• provides accessibility to the front panel controls
• allows connection to a power source and an antenna
• has nearby space for installation of a microphone hanger
2. Install the unit in accordance with paragraph 4.3 or 4.4.
In each appears an instruction to connect the power supply and
antenna. Where that appears, the following three steps should be
performed:
V
O
L
/
P
W
R
Figure 3.  General Installation 
						

							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 check the
power output and the standing wave ratio of the antenna after
installation.
4.3 INSTALLATION USING REGULAR MOUNTING
BRACKET
1. Mount the bracket using the washers, nuts, and long hex head bolts.
2. Thread the mylar washers onto the mounting bracket knobs.
3. Position the transceiver within the bracket arms, matching the
transceiver notches to obtain the desired positioning.
4. Secure the transceiver to the brackets with the mounting knobs (see
Figure 4).
5. Connect the antenna and power cables (and optional speaker) to the
transceiver.
Figure 4.  Regular Mounting Bracket 
						

							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 and insert the transceiver.
4. Fasten the brackets to the sides of the transceiver with the lock
washer nut combination, so that the mounting screw base faces the
mounting surface (see Figure 5).
5. Turn the adjusting screw to adjust the tension so that the
transceiver is tight against the mounting surface.
Bracket
Adjusting screw
Lock-washer nut combination
Figure 5. CMB16 Flush Mount Installation 
						

							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 threshold.”
6. Press the UP 
 or DOWN   key to select the desired channel. Refer
to the channel chart in the OWNER’S MANUAL SUPPLEMENT for
available channels.
7. When a message is received, adjust the volume to the desired
listening level.
5.2 TRANSMISSION
1. Perform steps 1 through 6 of RECEPTION.
2. Before transmitting, monitor the channel to ensure it is clear. THIS
IS AN FCC REQUIREMENT!
3. Press the PTT (push-to-talk) switch. The TX indicator on the LCD is
displayed.
4. Speak slowly and clearly into the microphone.
5. When the transmission is finished, release the PTT switch.
6. Refer to the OWNER’S MANUAL SUPPLEMENT for standard
transceiver operating procedures.
NOTE
This microphone should be positioned within 1 inch (2 cm) from the
mouth for optimum performance. 
						

							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 SIMPLEX/DUPLEX CHANNEL USE
Refer to the OWNER’S MANUAL SUPPLEMENT 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
operation 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 Canadian with each
press of the WX key.
2. USA will be displayed on the LCD for USA mode, INTL will be
displayed for International mode, and CAN will be displayed for
Canadian mode.
3. Refer to the OWNERS MANUAL SUPPLEMENT for allocated
channels in each mode. 
						

							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, 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. The transceiver is
capable of receiving this alert if the following is performed:
1. Program NOAA weather channels into the transceiver’s memory for
scanning. Follow the same procedure as for regular channels under
Section 5.8.
2. Press the SCAN key once to start memory scanning or hold down
the SCAN key during memory scanning to start priority scanning.
3. The programmed NOAA weather channels will be scanned along
with the regular-programmed channels. However, scanning will not
stop on a normal weather broadcast unless a NOAA alert is
received.
4. When an alert is received on a NOAA weather channel, scanning
will stop and the transceiver will emit a loud beep to alert the user of
a NOAA broadcast.
5. Press the WX key to stop the alert tone and receive the weather
report.
NOTE
If the WX key is not pressed the alert tone will be emitted for 5 minutes
and then the weather report will be received. 
						

							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 until MEM disappears on the LCD.
5. To start scanning, press the SCAN key. Scanning will proceed from
the lowest to the highest programmed channel number and will stop
on a channel when a transmission is received.
6. The received channel number will blink during busy stop.
7. To stop scanning, press the SCAN, 16/9, WX, or PTT key.
5.9 PRIORITY SCANNING (PRI-SCAN)
1. To select priority scanning, hold down the SCAN key and turn the
transceiver on.
2. Press SCAN key again.  Scanning will proceed between the
memorized channels (MEM CH) and the priority channel (P-CH).
The priority channel will be scanned after each programmed
channel.
(The priority channel (P-CH) is channel 16.)
3. To stop scanning, press the SCAN, 16/9, WX, or PTT key.
P-CH.MEM CH1MEM CH2P-CH.