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DaveMade M400 HG

Discussion in 'Amateur Radio Modifications' started by Unionbro, Jul 22, 2018.

  1. Unionbro

    Unionbro New Member

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    I ran across a package deal from a fella that used to work on radios back a few years ago, probably more like 10 plus years ago judging from the stuff he had.

    Anyway, amongst the stuff, and there was a lot of "Stuff" There was a DaveMade M400 HG. It looks like its in decent shape, cant see where any smoke got out of it, but there could be some bad pills etc...

    I did notice right off that the TX out was not wired into the board, and there's a couple other random wires in the same area not hooked up.



    It looks like someone removed the Min/Max RF knob as well, I dunno why you would wanna do that, but apparently it made sense to someone. The Transformer is there, the Big ass Capacitor is there, two bridge rectifiers, all 4 pills the ferrite cores, and 90 percent of the circuitry looks intact.

    My question is does someone else have one of these that could take some internal photo's so I could get an idea of how it should be wired.

    Better yet if someone had a set of Schematics that would be flippin Awesome!

    I think with a little TLC i could get this old girl talking again, but yet I'm at a loss, because I never had one to know how it should be wired.
     
    Shadetree Mechanic likes this.
  2. Unionbro

    Unionbro New Member

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    Looking around online at a few pictures, it looks like the TX relay is missing... So I'd need to know the specs on that for sure. Not sure if this had a driver or if it's just a 4 pill driven by the radio, I see a space for a driver pill on the board, but its not tapped and has no evidence of one ever being installed here.

    And of course the RF Min/Max knob is missing, I did find something in the other boxes of "Junk" that looks like it could have been the removed knob, its mounted on a small board with a trimmer pot. But it could just be chance.
     

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