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Old 14-08-2009, 20:05   #1
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IC-M422 Power Supply

I have purchased a IC-M422 to set up in my home. I have an old ICOM on my boat. The system says it needs a 12V battery and has a 10 AMP fuse.

I have purchased a Pro Series MG Power Supply to power the system. It has an output of cont. 10 amp / surge 12 amp @ 13.8VDC output.

I believe they are compatable. Are they?

Is it best to use a battery between the power supply and the VHF system or can I run straight from the power supply to the VHF?
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Old 14-08-2009, 21:00   #2
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VHF radios are pretty tolerant of voltage fluctuations. They have to be. I think you will be okay with the amount of current available from both power supplies.

Test out the power supplies by seeing how much of a voltage drop you get when transmitting at 25 watts.

I don't know about the laws of your country but as far as the laws go in the USA, people here must careful about using it their your home on land. Its usage must be marine related.
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Old 15-08-2009, 01:57   #3
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What rules !

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Originally Posted by David M View Post
VHF radios are pretty tolerant...

I don't know about the laws of your country but as far as the laws go in the USA, people here must careful about using it their your home on land. Its usage must be marine related.
As long as you include an order for a case of Mount Gay you'll be Marine Related, some how.
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Old 15-08-2009, 05:08   #4
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No laws here concerning the radio, although it will be 100% marine related.
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Old 15-08-2009, 07:13   #5
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Is it best to use a battery between the power supply and the VHF system or can I run straight from the power supply to the VHF?
I've been running my various ham radio transceivers directly off power supplies for decades and so far, so good...
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Old 15-08-2009, 09:08   #6
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The power supply should be adequate to run the radio without a battery, but if people complain about a hum on the radio you should run off a car battery and turn off the power supply when you are transmitting.
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Old 15-08-2009, 15:08   #7
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I had heard that there could be a hum but I thought that I would hear it not the receiver. If it happens, I will get a car battery.
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Old 15-08-2009, 15:13   #8
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A properly rectified power supply will not produce a hum either on the signal or in the receiver. Someone is probably confusing this with the hum often created by an unfiltered engine alternator power source.
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