Standard Horizon Marine Tranciever GX1250SA Operating Instructions

							GX1250SA Owner’s Manual page 19
6 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.
* 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.
In the unlikely event of serious problems, please contact your STANDARD
HORIZON Dealer or our repair facility. Address and phone numbers for this
facility, as well as warranty information, are contained in your Owner’s
Manual Supplement.
6.1 REPLACEMENT PARTS
Occasionally an owner needs a replacement mounting bracket or knob.
These can be ordered from our Parts Department by writing or calling:
STANDARD HORIZON, a division of VERTEX STANDARD.
17210 Edwards Rd., Cerritos, CA 90703, U.S.A.
(562)404-2700
Commonly requested parts, and their part numbers are listed below.
Microphone, White (CMP349WR) .............................. MP51000460
Microphone, Black (CMP349BR) ............................... MP51000470
Mounting Bracket, White ............................................ 457X160010
Mounting Bracket, Black ............................................ 457X160110
Mounting Bracket Knob, White .................................. 444X154030
Mounting Bracket Knob, Black ................................... 444X154130
Volume Control Knob ................................................. 444X154500
Squelch Control Knob ................................................ 444X154500
Power Cord ................................................................ ZC01300010
Mic Hanger, White ...................................................... 277X155020
Mic Hanger, Black ...................................................... 277X155120 
						

							page 20Owner’s Manual GX1250SA
PROBABLE
CAUSE
No DC voltage to the
transceiver, or blown
fuse.
Reversed power wires.
Engine noise
.
Incorrect plug on
speaker cable.
No problem.
Channel mode.
Antenna  REMEDY
Check the power cable for DC voltage,
or replace the fuse (6A 250V).
Make sure the red wire is connected to
the positive battery post and the black
wire is connected to the negative. If
the fuse still blows, contact your
STANDARD HORIZON Dealer.
Reroute the DC power cables away
from the engine. Add noise
suppressor on power cable.  Change
to resistive spark plug wires and/or
add an alternator whine filter.
The external speaker jack accepts
only RCA phono plugs.
Normal transceiver operation causes
internal speaker cut-off when external
speaker is plugged in.
The transceiver may be tuned to a
duplex channel meant for ship-to-shore
radiotelephone communications.
Have antenna checked or test the
transceiver with another antenna. If
problem persists, contact your
STANDARD HORIZON Dealer. SYMPTOM
Transceiver fails to
power up.
Transceiver blows fuse
when connected to
power supply.
Popping or whining noise
from the speaker while
engine runs.
External speaker plug
does not fit into jack.
Internal speaker turns off
when external speaker is
plugged in.
Transceiver transmits but
does not receive.
Transceiver transmits on
low power only.
TROUBLESHOOTING CHART
6.2 TROUBLESHOOTING CHART 
						

							GX1250SA Owner’s Manual page 21
7 SPECIFICATIONS
Performance specifications are nominal, unless otherwise indicated, and
are subject to change without notice.
7.1 GENERAL
Channels ........................................... All USA, International and Canadian
Input Voltage .................................................................... 13.8 VDC ± 20%
Current Drain
Standby ........................................................................................ 0.5A
Receive ........................................................................................ 1.5A
Transmit .................................................................. 6A (Hi); 1.7A (Lo)
Dimensions ............................................................. 2-1/2 H x 6 W x 6 D
(65 H x 150 W x 150 D mm)
Flush-Mount Dimensions .................................. 2 H x 5-3/8 W x 5-1/4 D
(50 H x 135 W x 133 D mm)
Weight .............................................................................. 1.9 Lb. (0.86 kg)
7.2 TRANSMITTER
Frequency Range ............................................... 156.025 to 157.425 MHz
RF Output .................................................................... 25 W (Hi); 1 W (Lo)
Conducted Spurious Emissions .............................. 65 dB (Hi); 50 dB (Lo)
Audio Response ................... within + 2/–8 of a 6 dB/octave pre-emphasis
characteristic at 300 to 3000 Hz
Audio Distortion .................................................................................... 5 %
Modulation .................................................................................. 16K0F3E
Frequency Stability (-20° to +50°C) .........................................±  0.0005%
FM Hum and Noise ................................................................... 40 dB min.
7.3 RECEIVER
Frequency Range ............................................... 156.050 to 163.275 MHz
Sensitivity:
20 dB Quieting .......................................................................... 0.4 µV
12 dB SINAD ........................................................................... 0.35 µV
Squelch Sensitivity (Threshold) ....................................................... 0.2 µV
Modulation Acceptance Bandwidth .............................................± 4.5 kHz
Selectivity:
Spurious and Image Rejection ................................................... 70 dB
Intermodulation and Rejection at 12 dB SINAD ......................... 65 dB
Audio Output ........................................................................................ 4 W
Audio Response .......................................... within + 2/–8 of a 6 dB/octave
de-emphasis characteristic at 300 to 3000 Hz
Frequency Stability (-20° to +50°C) ...........................................± 0.001 %
Channel Spacing ............................................................................. 25 kHz 
						

							Marine Division of Vertex Standard
US Headquarters
17210 Edwards Rd., Cerritos, CA 90703
Phone 562/404-2700
Fax 800/552/6813
Email [email protected]
www.vxstd.com
Printed in China
05/2001 457X851010