Standard Horizon Marine Tranciever GX1255S Operating Instructions

GX1255S8.4  OPERATING ON CHANNELS 13 AND 67
Channel 13 is used at docks and bridges and by vessels maneuvering in
port. Messages on this channel must concern navigation only, such as meet-
ing and passing in restricted waters.
Channel 67 is used for navigational traffic between vessels.
By regulation, power is normally limited to 1 Watt on these channels. Your
radio is programmed to automatically reduce power to this limit on these
channels. However, in certain situations it may be necessary to...

GX1255SPage 40 8.7  DIGITAL SELECTIVE CALLING (DSC)
Digital Selective Calling is a semi-automated method of establishing a radio
call, it has been designated by the International Maritime Organization (IMO)
as an international standard for establishing VHF, MF and HF radio calls. It
has also been designated part of the Global Maritime Distress and Safety
System (GMDSS) and it is planned that DSC will eventually replace aural
watches on distress frequencies and will be used to announce routine and
urgent...

GX1255S8.9.4  Safety Call
Used to transmit boating safety information to other vessels. This message
usually contains information about an overdue boat, a derelict afloat, loss of
a navigation aid or an important meteorological message.
8.10  ADDITIONAL DIGITAL SELECTIVE CALLING INFORMATION
For additional information the USCG has an excellent site that should be
visited at www.navcen.uscg.mil/marcoms/gmdss/dsc.html.
8.11  ABOUT VHF RADIO
The radio frequencies used in the VHF marine band lie between 156...

GX1255SPage 428.13  COAXIAL CABLE
VHF antennas are connected to the transceiver by means of a coaxial cable
– a shielded transmission line. Coaxial cable is specified by it’s diameter
and construction.
For runs less than 20 feet, RG-58/U, about 1/4 inch in diameter is a good
choice. For runs over 20 feet but less than 50 feet, the larger RG-8 or RG-
213/U should be used for cable runs over 50 feet RG-8 should be used. For
installation of the connector onto the coaxial cable refer to the figure...

GX1255S9  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...

GX1255SPage 44 9.2  FACTORY SERVICE
In the unlikely event that the radio fails to perform or needs servicing,
please contact the following:
Standard Horizon Factory Service
115 North Wright Brothers Drive
Salt Lake City, UT 84116-2838
Telephone (800) 366-4566
Fax No. (801) 359-4122
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. 

GX1255S9.3  TROUBLESHOOTING CHARTSYMPTON
Transceiver fails to
power up.Transceiver blows
fuse when connected
to power supply.Popping or whining
noise from the
speaker while engine
runs.Sound is not emitted
from the externalspeaker.
Receiving station re-
port low transmit
power, even with
transceiver set to HIpower.
“HI BATTERY” or
“LOW BATTERY”
message is scrolled
when the power isturned on.
Your position is not
displayed.PROBABLE CAUSE
No DC voltage to the
transceiver, or blownfuse.
Reversed power...

GX1255SPage 46 9.4  CONNECTION OF GPS WITH NMEA OUTPUT
Additional Information:
•The GPS must have the NMEA Output turned on and set to 4800 Baud
in the setup menu. If there is a selection for parity select none.
•For further information on interfacing /setting up your GPS. Please con-
tact the manufacturer of the GPS receiver.
•QUEST is corresponded with following NMEA sentence:
•NMEA-0183 version 2.0 or higher
•GLL, GGA, RMC and GNS (RMC sentence is recommended)
If you have further inquires, please feel...

GX1255S10.  CHANNEL ASSIGNMENTS
Tables on the following columns list the VHF Marine Channel assignments
for U.S.A. and International use. Below are listed some data about the charts.
1.VTS. Where indicated, these channels are part of the U.S. Coast Guard’s
Vessel Traffic System.
2.Alpha channel numbers, that is, channel numbers followed by the letter
A (such as Channel 07A) are simplex channels on the U.S.A. or Cana-
dian channel assignments whose counterparts in the International as-
signments are...

GX1255SPage 48 5.Channels normally used by recreational boaters are those that include
the term “non-commercial” in the Channel Use column of the chart. Some
of these are shared with other users and some are used only in certain
geographic regions.
6.Marine vessels equipped with VHF radios are required to monitor
Channel 16.VHF MARINE CHANNEL CHARTCHUCIS/DTXRXCHANNEL USE01XXD156.050160.650Public Correspondence (
Marine Operator)01AXS156.050Port Operation and Commercial. VTS in selected...