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  1. #1
    The Fluid of Spock KD8TUT's Avatar
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    Mega Watt Power Supplies?

    Hi guys,

    Are any of you familiar with the PSUs made by this company? I'm interested in any impressions you may have?

    http://www.megawattpowersupplies.com/
    --
    So there I was, totally naked. With only a rubber hose and a stuffed animal...

  2. #2
    Lord of the Flies WZ7U's Avatar
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    Can't speak directly to them myself, but I do run old server supplies at my place for HF. Set to 13.8v, 82A max per unit as well as a 5v terminal. Bought these for $20 each about 3 years ago used. Kinda reminded me of those.

    Sorry I'm not more help.

    On edit - HP branded server supplies, cycled out for age I'm sure. First learned about them from a friend into RC stuff. Apparently that demographic uses them to charge batteries.
    Last edited by WZ7U; 09-06-2019 at 01:56 PM. Reason: Remembered a detail - getting older sucks

    Like that post was...
    Moving on, my posts are not helpful

  3. #3
    Volcano Tamer n2ize's Avatar
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    Quote Originally Posted by WZ7U View Post
    Can't speak directly to them myself, but I do run old server supplies at my place for HF. Set to 13.8v, 82A max per unit as well as a 5v terminal. Bought these for $20 each about 3 years ago used. Kinda reminded me of those.

    Sorry I'm not more help.

    On edit - HP branded server supplies, cycled out for age I'm sure. First learned about them from a friend into RC stuff. Apparently that demographic uses them to charge batteries.
    If they are using them to charge up large Lithium Polymer batteries I sure as hell hope they are being careful and know what the heck they are doing. LiPO's tend to be extremely tempermental, especially during charging where they can produce one hell of an awesome and intense conflagration.
    I keep my 2 feet on the ground, and my head in the twilight zone.

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    The Fluid of Spock KD8TUT's Avatar
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    Quote Originally Posted by n2ize View Post
    If they are using them to charge up large Lithium Polymer batteries I sure as hell hope they are being careful and know what the heck they are doing. LiPO's tend to be extremely tempermental, especially during charging where they can produce one hell of an awesome and intense conflagration.
    They're all a bit temperamental. Although the Lithium Manganese can be forgiving.
    --
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  5. #5
    "Island Bartender" KG4CGC's Avatar
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    Quote Originally Posted by n2ize View Post
    If they are using them to charge up large Lithium Polymer batteries I sure as hell hope they are being careful and know what the heck they are doing. LiPO's tend to be extremely tempermental, especially during charging where they can produce one hell of an awesome and intense conflagration.
    Hello, John. What are you using LiPo's for?

  6. #6
    'Grumpy old bastid' kb2vxa's Avatar
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    Interesting. When I read "Built for... ...CB Radio... ...or a linear amplifier" my mind instantly flashed here https://www.youtube.com/watch?v=ef6z3MaLOrU (skip forward to 0:55 ) then at 1:13 jump to here https://www.youtube.com/watch?v=fEAGHixZHJg for more incredible mindlessness.
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    Quote Originally Posted by kb2vxa View Post
    Interesting. When I read "Built for... ...CB Radio... ...or a linear amplifier" my mind instantly flashed here https://www.youtube.com/watch?v=ef6z3MaLOrU (skip forward to 0:55 ) then at 1:13 jump to here https://www.youtube.com/watch?v=fEAGHixZHJg for more incredible mindlessness.
    "Dave-made, Dave-made, Dave-made".......


    The fact that the company's advertisements are directed at "Ham Radio" (not Amateur Radio) and list "CB Radio" on it's front page tells the whole story; a D.C. power supply that delivers 15 volts direct current at 400 amperes (6.0 Kw!); good to power a "128 pill" 12 volt bipolar transistor RF amplifier.

    How does that look on the primary side of the transformer, *if* this PSU was 100% efficient (it's not), it would pull 27 amps on a 220 volt A.C. circuit (234 vac in reality but, round numbers are easier).

    Towards the end of the page, he misspells "Reviews" and his "Reveiws" come from the WWDX free-band web site.

    Look harder, you can do better if you want to.

  8. #8
    Volcano Tamer n2ize's Avatar
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    Quote Originally Posted by kom View Post
    "Dave-made, Dave-made, Dave-made".......


    The fact that the company's advertisements are directed at "Ham Radio" (not Amateur Radio) and list "CB Radio" on it's front page tells the whole story; a D.C. power supply that delivers 15 volts direct current at 400 amperes (6.0 Kw!); good to power a "128 pill" 12 volt bipolar transistor RF amplifier.

    How does that look on the primary side of the transformer, *if* this PSU was 100% efficient (it's not), it would pull 27 amps on a 220 volt A.C. circuit (234 vac in reality but, round numbers are easier).

    Towards the end of the page, he misspells "Reviews" and his "Reveiws" come from the WWDX free-band web site.

    Look harder, you can do better if you want to.
    As soon as I saw this I was thinking "DAVE MADE". :)
    I keep my 2 feet on the ground, and my head in the twilight zone.

  9. #9
    Administrator N8YX's Avatar
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    Years ago, my friend Hi (W8UXE - SK) came across some 100-150A linear supplies that were designed to deliver unregulated, ~16VDC to industrial computer equipment. His solution to regulation was to equip each of several feeds with a regulator/pass transistor arrangement which would supply 12-13VDC @ 35-40A to each radio that required DC power. A larger pass transistor setup - higher Ic devices, with more of them in parallel - allowed currents of upwards of 100A for use with the odd HF or VHF amplifier.

    We measured the raw output @ >100A loading and most of these would only sag around 0.5V.

    I wish I could remember who made the supplies.
    Last edited by N8YX; 09-06-2019 at 12:30 PM. Reason: Grammar
    "Everyone wants to be an AM Gangsta until it's time to start doing AM Gangsta shit."

  10. #10
    Whacker Knot WTKX's Avatar
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    They look familiar in the form factor. Like the PSU types for those bigass road messaging signs that I used to work on.

    I have 4 28 VDC 40 amp supplies squirrelled away (rescued from the recycle bin at the old employer) that got tossed.

    Because we went from Skyline displays to Daktronics. Refurbished spares. So yea, solid state amps. Maybe.
    Most of the time we are punished if we go against the trend. Only at an inflection point are we rewarded. ~ George Soros



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