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Discussion of general interest including club business and events. Please post ARES discussion in the SC4ARES group.

Industrial power supplies for mobile units

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    Casey, KA5WAX

    hello Radio Illuminati!

    I am considering using a Mean Well closed-frame powersupply, such as one would find in all sorts of industrial equipment, to power a mobile unit while it’s… hmm immobile. One of their 13.2V, 7A supplies. There are supposed to be very quiet, electronically.

    Have any of you folks gone this route? Should I use a medical-grade unit?


    I haven’t tried them, but they have so many models you would have to dig up actual specs. I probably wouldn’t buy one for this purpose, but If had one, or got one cheap, I would try it 🙂

    Keep in mind, a 50W VHF/UHF transceiver will pull closer to 13A when transmitting. The popular ham radio switching supplies are the PowerWerx ss-dv30 (actually 25A) and they seem to be low noise. Or find an ancient Astron linear regulated supply. The only noise they generate is 60Hz vibration from the transformer.

    Casey, KA5WAX

    I’m pretty good w/Mean Well actual specs per se. One can just navigate their spec matix up the amperage vector.

    The missing ‘actual specs’ for these things are those about incidental RF emissions.

    How do you folks measure that? SDR?


    An AM radio with a magnetic bar antenna is pretty good. I don’t measure – I just find the source, and make a judgment on how serious it is. If I can’t hear it, it’s probably not an issue for me.

    There’s a load of info at

    “Locating RF Interference at HF” is a good article. A lot of the items published focus more on resolving that finding RFI, but a radio makes a good detector.

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