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Re: [softrock40] Re:EB63 Amp for rxtx6.3

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  • Sid Boyce
    ... If you would like to build one, I have a circuit (8Meg jpg) I just scanned from RadCom April 1989 ... works fine. You may be able to find a source for a
    Message 1 of 12 , Mar 1, 2009
      cesco12342000 wrote:
      >
      >
      > Hello Bruce,
      >
      >> Is this driving the EB63 with a S/R or another source?
      >
      > An elecraft K2 (the qrp version) with a 3db attenuator.
      >
      >> I'd like to know how the linearity looks when a S/R
      >> is driving the EB63 and when it (the S/R) starts to go non-linear
      >
      > I dont have the equipment necessary.
      > The pep rating of the eb63 is 200W, so lots of headroom there. But i would
      > rather get the other amp previously mentionned in the thread for the SR if
      > it's to be used on air.
      >
      > Myself i got "in love" with the 600w mosfet amp, but i cant figure out
      > where to get the 50V 20A power supply for it. Best idea so far is to
      > modyfy an old arc welder. Would make a great addition to the sdr1k ...
      >

      If you would like to build one, I have a circuit (8Meg jpg) I just
      scanned from RadCom April 1989 ... works fine. You may be able to find a
      source for a suitable transformer (45V-0-45V 750VA) - may be the arc
      welder transformer would do nicely.
      It uses 2 darlingtons as pass transistors, just lucky that a friend had
      some months earlier given me some MJ4034's which turned out to be
      excellent substitutes for the BDX67's. I suppose any high power NPN
      darlingtons would do.
      I built mine going way back then and added a 28V PS in the same case to
      supply the EB104 RX/TX vacuum relays.
      73 ... Sid.
      --
      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
    • alexle188
      - ... Hi Cesco, For my EB104 MOSFET PA, I use a switch mode 50V 25A PSU from Harmer & Simmmons. These PSU s are designed for telecoms operations and have very
      Message 2 of 12 , Mar 2, 2009
        -
        > Myself i got "in love" with the 600w mosfet amp, but i cant figure out
        > where to get the 50V 20A power supply for it. Best idea so far is to
        > modyfy an old arc welder. Would make a great addition to the sdr1k ...
        >

        Hi Cesco,

        For my EB104 MOSFET PA, I use a switch mode 50V 25A PSU from Harmer &
        Simmmons. These PSU's are designed for telecoms operations and have
        very low noise. The model I use is an old obsolete one, SM1350. The
        nominal output voltage is 48V but you can adjust it to 50V.

        The current model that you can buy is SM1600, ie 1.6kW or 30A output.
        See link below:

        http://www.harmerandsimmons.com/opencms/en/products/Telecom/RectefierModules/Singlephaseinput/48VdcrectifierModules/SM1600/index.html

        In case you get "in love" later with AR347, I use two of the SM1350's
        in parallel (with bridging diodes) to provide 50V at 50A as the PSU
        when I want to go full power. Usually I just connect one of the
        SM1350's to run it at 600W PEP.

        73's

        Alex
      • cesco12342000
        ... Nice. Looks pricy too ... I will try the Sid Boyce way first, i have 2 arc welders i never use since i got the mig welder, so it doesent hurt to
        Message 3 of 12 , Mar 2, 2009
          > I use a switch mode 50V 25A PSU from Harmer & Simmmons.

          Nice. Looks pricy too ...

          I will try the "Sid Boyce" way first, i have 2 arc welders i never use
          since i got the mig welder, so it doesent hurt to slaughter one of
          them.

          > later with AR347, I use two of the SM1350's

          Wow. I see your years ahed. I have not even ordered the eb104 ...
        • wa3drc_18954
          I would get 2 24v 20A switching supplies on ebay and put them in series. I got a couple for 2 different microwave amps that need 26V at 20 amps. They adjust up
          Message 4 of 12 , Mar 2, 2009
            I would get 2 24v 20A switching supplies on ebay and put them in
            series. I got a couple for 2 different microwave amps that need 26V at
            20 amps. They adjust up that high in voltage and run great. very small
            and light too... They were pretty cheap too.

            Ed wa3drc

            --- In softrock40@yahoogroups.com, "cesco12342000" <cesco1@...> wrote:
            >
            > Hello Bruce,
            >
            > > Is this driving the EB63 with a S/R or another source?
            >
            > An elecraft K2 (the qrp version) with a 3db attenuator.
            >
            > > I'd like to know how the linearity looks when a S/R
            > > is driving the EB63 and when it (the S/R) starts to go non-linear
            >
            > I dont have the equipment necessary.
            > The pep rating of the eb63 is 200W, so lots of headroom there. But i
            would
            > rather get the other amp previously mentionned in the thread for the
            SR if
            > it's to be used on air.
            >
            > Myself i got "in love" with the 600w mosfet amp, but i cant figure out
            > where to get the 50V 20A power supply for it. Best idea so far is to
            > modyfy an old arc welder. Would make a great addition to the sdr1k ...
            >
          • k5nwa
            ... I bought 4 of these when they were on sale for $12.95 for use with a linear. -- Cecil Bayona K5NWA
            Message 5 of 12 , Mar 2, 2009
              On 3/2/2009 3:17 PM, wa3drc_18954 wrote:
              > I would get 2 24v 20A switching supplies on ebay and put them in
              > series. I got a couple for 2 different microwave amps that need 26V at
              > 20 amps. They adjust up that high in voltage and run great. very small
              > and light too... They were pretty cheap too.
              >
              > Ed wa3drc
              >
              I bought 4 of these when they were on sale for $12.95 for use with a linear.

              < http://www.mpja.com/prodinfo.asp?number=17429+PS >

              --

              Cecil Bayona
              K5NWA
              www.k5nwa.com www.qrpradio.com
              < http://parts.softrockradio.org/>

              "Windows, the most successful software virus ever" Don Seglio Batuna
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