Question about Icom M302 VHF Radio

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Icom vhf radio

I have a twin engine outboard boat and when i have my engine off i don't have any issues with my vhf. Once i turn either engine on i get a hum in my vhf speaker. It does not matter what engine is on. Do i have a bad filter in my vhf. I also don't get the hum in my stereo system pulling off the same power source as the vhf. Any ideas?

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Re: icom vhf radio

I have the same unit. i get interferance from my depth finder wire touching the antena wire off the back of the radio. make sure that no wires are touching the antena wire.

Posted on Dec 01, 2008

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Try Ebay as a source. I have had good luck finding such accessories for reasonable.

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Sound like a speaker problem, dosconnect the speaker and check it with a meter, it should read 8 ohm. Good luck.

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On the ICOM M604 will not receive the weather channels, will receive other close radio's.


This is almost ALWAYS caused by a problem (a short OR an open) in the coax cable from the VHF radio to the antenna. An easy way to check is to JUST insert the PL-259 connector into the socket of the radio, making sure that ONLY the center pin is making contact with the socket. If the weather channels come in clearly, then it's usually an easy fix. Simply check the connections at each end of the coax, looking for a poor center pin solder connection or perhaps a bit of the ground braid is shorting out the center lead. A magnifying glass is a great tool to spot problems.

If the coax proves NOT to be the problem, then the fault is likely to be in the radio itself and is probably a bad solder connection where the antenna chassis mount attaches to the PC board.

Hope this is helpful.
Good Luck!

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1 Answer

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It sounds like your vhf speaker has failed. I recommend taking your radio to a repair shop and replacing the speaker...this should solve your problem.

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I have an icom m304marine vhf with a shakespeare

Sound like you have an antenna issue. Try a different antenna with coax. If the problem is still there, than you have a problem with the radio. Icom makes really good marine radios but you could have a defective one.

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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.

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3 Answers

Any recommendations?

You can find a helpful guide at the following link:

Have fun!

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