Pete & Jim Posted November 5, 2017 Share Posted November 5, 2017 Recently purchased a GME GX300 Marine/CB radio, could not get it to communicate with the car CB, went out on Sydney Harbour, kept trying for a radio check, but couldn't get anyone to answer. Thought the aerial might be the problem, so purchased new 27mhz aerial, still nothing, does anybody have any ideas? Or what to do next? Link to comment Share on other sites More sharing options...
rickmarlin62 Posted November 5, 2017 Share Posted November 5, 2017 apparently the 300 has both 27meg and cb band make sure you are choosing the right channels for 27 if you have that aerial...rick Link to comment Share on other sites More sharing options...
Sea Ranger Posted November 5, 2017 Share Posted November 5, 2017 If your display is showing 1 to 40 for channels then you are in car CB mode if your display is showing 68 to 98 then it is in Marine mode. If I remember right you turn on the radio holding the priority button to change between the 2. 68 Commercial, ship-shore-ship 72 Professional Shipping 82 Professional Shipping 86 Secondary distress and safety 88 Primary distress and safety 90 Domestic ship-shore-ship 91 Domestic ship-shore-ship 94 Club events, ship-shore-ship 96 Ship to ship 98 Rescue organisations Don't transmit without an antenna it could do damage to the radio. Bear Link to comment Share on other sites More sharing options...
rickmarlin62 Posted November 6, 2017 Share Posted November 6, 2017 ps hardly anyone uses 27meg anymore vhf has taken over further north 27meg isn't monitored by coastal patrol anymore.....I havnt used 27mg in four years as we were warned then it was being phased out..rick Link to comment Share on other sites More sharing options...
Cargo05 Posted December 3, 2017 Share Posted December 3, 2017 Marine Rescue still monitor 27MHz, but fewer boaties are using it. VHF is a better option. Link to comment Share on other sites More sharing options...
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