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ICOM M502

Old 04-21-2008, 03:58 PM
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Default ICOM M502

My icom m502 was not transmitting I sent in back to icom and
they replaced the PA module and it worked fine for about a month. Now it is doing the same thing again . does anyone know what would cause this? I think i will just get a new radio
now that i lost trust in this one.
Old 04-21-2008, 05:15 PM
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Default Re: ICOM M502

Not enough power getting to the radio,bad connection some ware.
Old 04-21-2008, 05:36 PM
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Default Re: ICOM M502

How long is the coax between the radio and the antenna?

Has the radio end of the transmission line been checked?

What kind of signal reports did you get from the folks you talked to after it was fixed?
Old 04-21-2008, 05:37 PM
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Default Re: ICOM M502

THANKS TOM
THAT WOULD BLOW OUT THE MODULE ? IS THERE A CHANCE THE MODULE IS NOT BAD AND JUST NEEDS TO BE WEWIRED ?
Old 04-21-2008, 06:13 PM
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Default Re: ICOM M502

I have seen a lot of radios not transmit due to lack of power. I have not seen one with a blown module yet. I think its a good chance the radio is ok and just needs to be rewired.
Old 04-21-2008, 11:28 PM
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Default Re: ICOM M502

If the PA had to be replaced I would throw out that antenna. Or at least have it checked out.

Antennas have to be carefully tuned. Otherwise you get reflected power. When too much power is reflected back to the radio you end up blowing out the PA.

If the antenna is not working, you can replace the power wire 100 times and get 200 new radios, but the end result will be the same. Have someone with a GOOD SWR meter check the radio. That garbage unit sold at marine stores for $50 is just that - garbage. If you want a decent meter you have to go to an amateur radio supply store. They start at around $100.

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