Question about ICOM Informatique GP-270ML GPS Receiver

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Icom GP270ML New boat to me, Icom installed and suspect running at one time. Start up, but does not locate it's self....does not recieve bars. Is there a way to check antenna? What steps should I take? Thank you

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Put in a new battery. I had same problem.Sent to Icom and was told the board was bad. Soldered in new battery and is fine. Cheap way to do it. May work and may not. Worth the small amt to try and repair.Fixed two others putting in new battery.

Posted on Jul 12, 2008


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My VHF Marine Radio transmits very well -over 30 miles but only recieves about 6 miles. The boats that are calling me also have very high antennas so hight is not the problem. The boat is new and we are on...

I don't have much experience of radio transceivers but I do have a couple of ideas.

The big question is how do you know your radio transmits 30 miles but receives only 6 miles?
Clearly you have a friend with a transceiver and you have been playing around together until you formed those conclusions.

What if the other radio received well but didn't transmit so well? Have both radios been checked with a field strength meter to ensure they are both radiating similar power outputs?

Do you receive the carrier wave but no audio at a range greater than 6 miles? If so your friend's radio (and others) might have a modulation problem. Has the signal(s) been analysed with an oscilloscope?

It is often imagined the transmission envelope is circular radiating from the antenna at the centre but that is often wrong. The radiation envelope is often distorted by a ground plane. Imagine an antenna mounted at the centre of an aluminium boat hull, the radiation envelope would be elliptical in line with the hull.

Even with a fibreglass hull the presence of metal masses can pull the radiation envelope out of shape lengthening the range of both transmission and receiving in one direction and shortening them in another.

There is another possibility to poor reception and that is a high amount of interference that might be airborne being received by the internal radio circuitry, by several means - antenna or the poor screening of the downlead and could be aggravated by poor grounding. Interference can also be on the supply line and both types can be generated by a host of electrical or electronic equipment.
Generators and motors, voltage regulators or stabilisers, local oscillators, fluorescent lighting, inverters, computers...

The basic radio of the old days could have the Squelch turned off and an experienced operator can hear much of what is or isn't happening.

Nov 23, 2017 | ICOM Informatique Icom IC-M402 VHF Marine...

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Static on radios not all time

hi by ajusting the squelch level in the menu you will solve this problem ,also check antenna connections aswell you might have to return them where you bought them to get them ajusted

Apr 13, 2010 | ICOM Informatique 2nd radio Icom F221...

1 Answer

Turning on my Lowrance LCX 111HD fish locator creates static with my ICOM M502 VHF Marine radio.

Hello LJones0455. From your detailed attempts there are few options. Position the transducers one foward one aft. Connect the negitives of the battiers to the boat still route both positive & negitive wiring to all devices. Check the continunity of your transducers include flexing while ohming. Let me know of the results.

Oct 07, 2008 | Boating

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