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while transmitting). Once the selected channel has become inactive for 2 seconds the Triple 
Watch will resume.

To transmit on the selected channel while Triple Watching

Simply press the 

PTT

. The Triple Watch function will pause during the transmission and remain 

paused until 2 seconds after all activity has ceased on the channel. Triple Watch will then resume.

To transmit on the Priority channel while Triple Watching 

Briefly press the 

PR1

 key. The PR1 channel will then become the selected channel. Now press 

the 

PTT 

and transmit in the usual way. When your conversation has ended you may use the 

 or   keys to re-select your preferred channel.

To transmit on Channel 88 while Triple Watching 

Press the   button. Triple watch will be cancelled and the radio will switch straight to Channel 
88 (and ‘SAFETY’ will be displayed). Now press the 

PTT

 and transmit in the usual way. When 

your conversation has ended, press the   button to deactivate the SAFETY channel and press 
the 

TW

 key to resume Triple Watching.

MARINE BAND PROCEDURES

Most calls to other vessels or stations are initiated on Channel 88. After listening to ensure 
Channel 88 is clear, call the other station as follows, repeating both call signs three times.

e.g. “Coast Guard, Coast Guard, Coast Guard. This is – Sea Spray, Sea Spray, Sea Spray, Over”

Once contact has been established, move straight to another channel (e.g. 91 or 94) to continue 
your conversation, leaving Channel 88 clear for emergencies or further calls. Don’t forget to 
return to Channel 88 when you have finished (or select Dual Watch on your radio) otherwise  
you may miss other calls meant for you.

EMERGENCY PROCEDURES

All emergency calls should be made on Channel 88. There are three main types of emergency call.

1. “MAYDAY, MAYDAY, MAYDAY”

This call should be used when you are in grave or imminent danger and require immediate 
assistance. You should call MAYDAY three times followed by your vessel’s name or call sign  
three times. Then state your position, a brief description of your vessel, the nature of the 
emergency, the number of people on board and their condition. If you hear no reply, repeat  
the call at short intervals because someone may be able to hear you but you might not be  
able to receive their reply.

After contact has been made, follow any instructions given to you.

2. “PAN, PAN, PAN”

Use this call when an emergency situation exists but there is no immediate danger. The call 
should be made in the same way as the MAYDAY call. If you hear no reply, repeat the call at 
regular intervals.

3. “SECURITE, SECURITE, SECURITE” (Pronounced Say-cure-e-tay)

This call is used to warn shipping of dangers or hazards, e.g. Bad weather, container adrift etc. 
The call may be made to a local monitoring station or to all ships in the area.

Summary of Contents for G-COM GX400

Page 1: ...GX400 27 MHz RADIO I N S T R U C T I O N M A N U A L...

Page 2: ...8 Key Lock function 8 OPERATION ON THE AUSTRALIAN MARINE BAND 8 Dual Watch marine mode 8 Triple Watch marine mode 9 Triple Watch features 9 Marine Band procedures 10 Emergency procedures 10 OPERATION...

Page 3: ...ne mode Channel 8 in CB mode speaker microphone two Priority channels and a backlit Liquid Crystal Display LCD with dimming function With its compact size and IPX7 design it can easily be installed in...

Page 4: ...or tractor When you first install your GX400 it should default to the 27 MHz Marine Band When operating on the Marine Band the radio will display channels 68 98 and the key will default to safety Cha...

Page 5: ...tch Triple Watch Key Lock Noise Limiter Transmit Safety Channel Scan Memory Scan RX Busy Channel Display LCD Rear Mic Socket Antenna Socket Extension Speaker 3 5 mm Programming 2 5 mm factory use only...

Page 6: ...se CHANNEL SELECTION Select the required channel by briefly pressing the or keys The selected channel is displayed on the LCD Press and hold either key to quickly advance upwards or downwards through...

Page 7: ...ll disappear To scan Adjust the Squelch control so the radio is quiet then briefly press the SCN key A high beep will be heard SCAN will appear in the display and the channel numbers will change rapid...

Page 8: ...able To lock the keys press and hold the key for 1 second The icon is displayed and a high beep is heard To unlock the keys press and hold the key again The icon disappears and a low beep is heard OPE...

Page 9: ...e stored in the PR1 memory To use the Triple Watch mode first program your Priority channel into the PR1 memory then select your preferred working channel using the or keys Now briefly press the TW ke...

Page 10: ...s is Sea Spray Sea Spray Sea Spray Over Once contact has been established move straight to another channel e g 91 or 94 to continue your conversation leaving Channel 88 clear for emergencies or furthe...

Page 11: ...nother selected channel by quickly switching between them Any signals received on Channel 8 take precedence over signals on the selected channel To use the Dual Watch feature adjust the squelch contro...

Page 12: ...annel 8 Once Channel 8 has become inactive for 2 seconds the Triple Watch function will resume If a signal appears on the PR1 channel Scanning will pause on the PR1 channel but Channel 8 will continue...

Page 13: ...Use 5 27 015 MHz General AM 25 27 245 MHz General Use 6 27 025 MHz General AM 26 27 265 MHz General Use 7 27 035 MHz General AM 27 27 275 MHz General Use 8 27 055 MHz General AM 2 28 27 285 MHz Genera...

Page 14: ...ion speaker can be installed if required Components and currents in the radio create magnetic fields To avoid interference to compasses ships autopilot sensors etc the GX400 should be mounted at least...

Page 15: ...the Negative side of the battery or to a ground point in your vessel or vehicle IMPORTANT The RED power lead is fitted with a 2 Amp fuse If the fuse blows use only a standard 2 Amp 3AG fuse as a repl...

Page 16: ...sound to another part of your vessel e g If the radio is mounted inside the cabin the extension speaker can be used to monitor incoming calls while outside When the extension speaker is plugged in th...

Page 17: ...he cable entry hole and slide it along the microphone cable away from the front panel 2 Identify the plug locking lever work the screwdriver blade behind it and press the lever towards the plug body A...

Page 18: ...ive Sensitivity for 12 dB SINAD 30 Modulation 110 dBm Max Squelch 65 dBm Adjacent Channel Selectivity 55 dB Spurious Response Immunity 55 dB Conducted Spurious Radiation 57 dBm Audio Output Power 8 Oh...

Page 19: ...to any one of the following as we decide i The supplying of the services again ii The cost of having the services supplied again 2 4 For repairs outside the warranty period we warrant our repairs to b...

Page 20: ...mber 47121 5 A division of Standard Communications Pty Ltd Head Office PO Box 96 Winston Hills NSW 2153 Australia New Zealand PO Box 58446 Botany Auckland 2163 NZ T 09 274 0955 All international enqui...

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