Standard Horizon Marine Tranciever GX1256S Operating Instructions

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9  RAM+ MIC OPERATION
If the enhanced optional RAM+ Mic (CMP25) is connected to the remote
microphone connector on the transceiver’s rear panel, the transceiver can
use the remote control operation except for a few functions. The RAM+ Mic
supplied with 23 feet (7 m) of routing cable and can be extended up to 70
feet (21 m) using three 23 feet extension cables model CT-100. The inter-
com operation can be used between the RAM+ Mic and the transceiver.
9.1  RAM+ MIC CONTROLS
SQUELCH CONTROL...

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VOLUME KEY (
VOL)
Activates the volume adjusting mode.
Press this key to activate the volume adjusting mode. Press the
microphone’s [

]
 or [
]
 to adjust the volume.
POWER SWITCH (
PWR)
Press and hold down this key to turn to the transceiver and RAM+ Mic on
and off.
PTT (
Push-To-Talk)
 SWITCH
Activates transmission.
[
H/L]
 KEY
Toggles between high and low power. When the [
H/L]
 key is pressed
while the transceiver is on channel 13 or 67, the power will temporarily
switch from LO to...

GX1256SPage 53
[
CALL/SET]
 Key
The [
CALL/SET]
 key functions as the enter key.
Secondary use
Press the [
CALL/SET]
 key to access the DSC OPERATION menu.
Press and hold the [
CALL/SET]
 key to access the SETUP menu.
[
DW]
 Key
Watches for a transmission on CH16 and another selected channel until
either signal is received. (Dual watch)
NOTE: When the DSC SCANNING feature is enabled (see section 7.15
DSC SCAN), the radio watches for a transmission on CH16, another
selected channel, and CH70 until either...

GX1256SPage 54
sent, the radio will sound a Distress Alarm.
4. The transceiver “shadow-watches” for a transmission
on CH16 or CH70 until an acknowledgment signal is
received. “DISTRESS” and “WAITING” will appear on
the LCD.
5. If an acknowledgement is received, select channel 16
and advise your distress situation.
6. If no acknowledgment is received, the distress call is repeated in 4
minute intervals until an acknowledgment is received.
7. When a DSC Distress acknowledgment is received, a distress...

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9.3  DSC/RADIO SETUP MODE
The  CMP25 can access the DSC / RADIO setup menu (refer to section 7
“DIGITAL SELECTIVE CALLING” and section 8 “RADIO SETUP MODE” for
details). However, the LAMP, CONTRAST, and KEY BEEP menu item which
is accessed from the CMP25 only controls the CMP25’s display and speaker.
DSC/RADIO Setup mode from the CMP25:
1. Press and hold down the [
CALL/SET]
 key until “RADIO SETUP” menu
appears.
2. Press the [

]
/[
]
 key to select “RADIO SET” or “DSC SETUP” menu.
3....

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10  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...

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10.2  FACTORY SERVICE
In the unlikely event that the radio fails to perform or needs servicing, please
contact your Dealer or Marine Division of Vertex Standard.
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. 

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10.3  TROUBLESHOOTING CHART
PROBABLE CAUSE
No DC voltage to the
transceiver, or blown
fuse.
Reversed power
wires.
Engine noise.
External cable.
Antenna.
The power supply volt-
age is too high or too
low.
External cable.
Setting of the GPS
navigation receiver.
REMEDY
a. Check the 12 VDC battery con-
nections and the fuse.
b. The VOL/PWR knob needs to be
pressed and held to turn the ra-
dio on.
Check the power cable for DC volt-
age, or replace the fuse (6A 250V).
Make sure the red wire is...

GX1256SPage 59
11.  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...

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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 CHARTCH U C I S/D TX RX CHANNEL USE01 X X D 156.050 160.650 Public Correspondence (
Marine Operator)01A X S 156.050 Port Operation and Commercial. VTS in...