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Re: 5w amplifier

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  • jim.veatch@verizon.net
    The HobbyPCB 5W driver works nicely with the Softrock, it s linear (so you can run it on any mode) and you can wind the output XFMR 4:1 and get 10W output. It
    Message 1 of 12 , Nov 15, 2012
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      The HobbyPCB 5W driver works nicely with the Softrock, it's linear (so you can run it on any mode) and you can wind the output XFMR 4:1 and get 10W output. It uses the RD16HHF-1 MOSFET. I know it's showing out-of-stock right now but Curtis will put some up for sale later. Details for the 5/10W driver are here:

      https://sites.google.com/site/hardrock50beta/home/using-the-driver-as-a-5w-pa

      We have redesigned the driver for the next run of H50's and it will have space for a T/R relay and 5 element lowpass filter.

      If $260 is too steep for an amplifier and you are handy with a soldering iron, the PCB for the PA from the DSP-610 transceiver in the August QST is also at http://www.hobbypcb.com/amateur-radio.html that amplifiet is 0.5W for 50W output, just like the H50 but it only supports 2 output LPF's so it can cover 2-4 ham bands depending on which ones you choose.

      Details for building the PA and the entire DSP-610 are on the wiki:

      https://sites.google.com/site/dsp610constuction/home

      I'm around and available for email support for any of these projects.

      73's
      Jim WA2EUJ


      --- In softrock40@yahoogroups.com, KENNETH CHASE <chase8043@...> wrote:
      >
      > The kitsandparts 5W amp is CW only.
      >  
      > Ken VA3ABN
      >
      > From: John Greusel <greusel@...>
      > To: "softrock40@yahoogroups.com" <softrock40@yahoogroups.com>
      > Sent: Wednesday, November 14, 2012 4:23:48 PM
      > Subject: Re: [softrock40] 5w amplifier
      >
      >  
      >
      >
      >  I second Sid's endorsement.I use that amp every day and I've tortured it with wet coaxial connectors and high SWR and it just keeps working.The heatsink (I have the largest one without a fan) barely even get warm running digital modes. However- drilling and tapping that heatsink is not easy. If I built another I think I'd opt for the predrilled one.JohnKC9OJV
      >
      > From: Sid Boyce <sboyce@...>
      > To: softrock40@yahoogroups.com
      > Sent: Wednesday, November 14, 2012 3:14 PM
      > Subject: Re: [softrock40] 5w amplifier
      >
      >  
      > On 14/11/12 20:56, Chris Wilson wrote:
      >
      >  
      > >> > Hi all, I got this 5w amp kit from kitsandparts.com:> http://www.kitsandparts.com/qrp_amp2.php> I have a low pass filter already to put on the output of the amp, and I built for 20/30/40 fyi.> I want to see how to tie the amp in to the transmit of my softrock> txrx ensemble. The notes say it takes 5 to 10 mW rf in, but I know> the softrock puts out a full watt. Do I need an attenuator, or do I> need to bypass the built-in amp on the softrock? Also, I assume this> is a simple always-on amp, and I need something like the circuit in> the upper left of this schematic to bypass it for receive:> http://www.m0rzf.co.uk/resources/20W-Amp-Iss.C.pdf> But I'm a novice and the details are sketchy. > Can someone help me design a simple circuit to connect to the amp?> Thanks. I promise to report back with good measurements, etc. I have> access to a scope, an IC-735 transceiver, etc.Watching with great interest, my next step is adding a small amp to myRXTX
      > Ensemble, and I agree, the info is probably fine to a dyed in thewool ham, but to a novice like myself it seems a bit sparce. Wouldlike to see comprehensive instruction on the switching. I wouldimagine, relay ratings aside, it follows the same switching schematicswhether you are running a watt or a kilowatt? 14/11/2012 20:53-- Best Regards,Chris Wilson. 2E0ILYhttp://www.qsl.net/k5bcq/Kits/Kits.htmlDown the page to The 20W HF Amplifier Kit #15.Kees also supplies resistors in the kit for a 3dB attenuator at the input.What's more it covers 6m as well.It's an excellent kit.I got the drilled heatsink as it was also on offer.73 ... Sid.
      > --
      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
      >
    • wfahle
      Ah, didn t know about the digital modes. I was intending to use it as CW only and was aware of that. Thanks for all the great responses; I need to look into
      Message 2 of 12 , Nov 15, 2012
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        Ah, didn't know about the digital modes. I was intending to use it as CW only and was aware of that. Thanks for all the great responses; I need to look into the 20w amp too, as I am also building a peaberry. Thanks for everything you all do; as I progress on this project I will keep everyone posted and include detailed build steps and diagrams, and ask questions before I turn anything on :) Maybe I can help other novice builders as I go.

        --- In softrock40@yahoogroups.com, cbayona <CBayona@...> wrote:
        >
        > That is a class C amplifier (non-linear) no good for SSB, and many
        > digital modes, good for CW.
        >
        > At 01:52 PM 11/14/2012, you wrote:
        > >Hi all, I got this 5w amp kit from kitsandparts.com:
        > >http://www.kitsandparts.com/qrp_amp2.php
        > >
        > >I have a low pass filter already to put on the output of the amp,
        > >and I built for 20/30/40 fyi.
        > >
        > >I want to see how to tie the amp in to the transmit of my softrock
        > >txrx ensemble. The notes say it takes 5 to 10 mW rf in, but I know
        > >the softrock puts out a full watt. Do I need an attenuator, or do I
        > >need to bypass the built-in amp on the softrock? Also, I assume this
        > >is a simple always-on amp, and I need something like the circuit in
        > >the upper left of this schematic to bypass it for receive:
        > >http://www.m0rzf.co.uk/resources/20W-Amp-Iss.C.pdf
        > >But I'm a novice and the details are sketchy.
        > >Can someone help me design a simple circuit to connect to the amp?
        > >Thanks. I promise to report back with good measurements, etc. I have
        > >access to a scope, an IC-735 transceiver, etc.
        > >
        > >
        > >
        > >
        > >------------------------------------
        > >
        > >Yahoo! Groups Links
        > >
        > >
        > >
        > --
        > Cecil - k5nwa
        > http://www.softrockradio.org/ http://thepartsplace.k5nwa.com/
        >
        > Never take life seriously. Nobody gets out alive anyway.
        >
      • wfahle
        Ok, I noticed it was switched via signal for full-break-in CW, but does it also need a relay for SSB? I want to add SSB to my peaberry when I get it done.
        Message 3 of 12 , Nov 15, 2012
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          Ok, I noticed it was switched via signal for full-break-in CW, but does it also need a relay for SSB? I want to add SSB to my peaberry when I get it done. Thanks. I like that the attenuation is there so the amp doesn't overload from the softrock; better safe than sorry.

          --- In softrock40@yahoogroups.com, Sid Boyce <sboyce@...> wrote:
          >
          > On 14/11/12 20:56, Chris Wilson wrote:
          > >
          > >
          > >
          > > >
          > > > Hi all, I got this 5w amp kit from kitsandparts.com:
          > > > http://www.kitsandparts.com/qrp_amp2.php
          > >
          > > > I have a low pass filter already to put on the output of the amp,
          > > and I built for 20/30/40 fyi.
          > >
          > > > I want to see how to tie the amp in to the transmit of my softrock
          > > > txrx ensemble. The notes say it takes 5 to 10 mW rf in, but I know
          > > > the softrock puts out a full watt. Do I need an attenuator, or do I
          > > > need to bypass the built-in amp on the softrock? Also, I assume this
          > > > is a simple always-on amp, and I need something like the circuit in
          > > > the upper left of this schematic to bypass it for receive:
          > > > http://www.m0rzf.co.uk/resources/20W-Amp-Iss.C.pdf
          > > > But I'm a novice and the details are sketchy.
          > > > Can someone help me design a simple circuit to connect to the amp?
          > > > Thanks. I promise to report back with good measurements, etc. I have
          > > > access to a scope, an IC-735 transceiver, etc.
          > >
          > > Watching with great interest, my next step is adding a small amp to my
          > > RXTX Ensemble, and I agree, the info is probably fine to a dyed in the
          > > wool ham, but to a novice like myself it seems a bit sparce. Would
          > > like to see comprehensive instruction on the switching. I would
          > > imagine, relay ratings aside, it follows the same switching schematics
          > > whether you are running a watt or a kilowatt?
          > >
          > > 14/11/2012 20:53
          > >
          > > --
          > > Best Regards,
          > > Chris Wilson. 2E0ILY
          > >
          > >
          > http://www.qsl.net/k5bcq/Kits/Kits.html
          > Down the page to The 20W HF Amplifier Kit #15.
          > Kees also supplies resistors in the kit for a 3dB attenuator at the input.
          > What's more it covers 6m as well.
          >
          > It's an excellent kit.
          > I got the drilled heatsink as it was also on offer.
          > 73 ... Sid.
          >
          > --
          > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
          > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
          > Senior Staff Specialist, Cricket Coach
          > Microsoft Windows Free Zone - Linux used for all Computing Tasks
          >
        • Chris Wilson
          ... 15/11/2012 19:43 That looks good Sid, and it does 160 meters, too, which is good as I have just bought a V6.2 mono band RXTX off the bay for 160 meters. I
          Message 4 of 12 , Nov 15, 2012
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            > http://www.qsl.net/k5bcq/Kits/Kits.html
            > Down the page to The 20W HF Amplifier Kit #15.
            > Kees also supplies resistors in the kit for a 3dB attenuator at the input.
            > What's more it covers 6m as well.

            > It's an excellent kit.
            > I got the drilled heatsink as it was also on offer.
            > 73 ... Sid.


            15/11/2012 19:43

            That looks good Sid, and it does 160 meters, too, which is good as I
            have just bought a V6.2 mono band RXTX off the bay for 160 meters. I
            may well have a bash at one of those, thanks! Can't see me using 6
            meters, as I have no suitable antenna.



            --
            Best Regards,
            Chris Wilson. 2E0ILY
          • Sid Boyce
            ... I don t have a 6m antenna at the moment but a 6m antenna is very easy to build, even a dipole takes up little space. 73 ... Sid. -- Sid Boyce ... Hamradio
            Message 5 of 12 , Nov 15, 2012
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              On 15/11/12 19:45, Chris Wilson wrote:
               



              > http://www.qsl.net/k5bcq/Kits/Kits.html
              > Down the page to The 20W HF Amplifier Kit #15.
              > Kees also supplies resistors in the kit for a 3dB attenuator at the input.
              > What's more it covers 6m as well.

              > It's an excellent kit.
              > I got the drilled heatsink as it was also on offer.
              > 73 ... Sid.

              15/11/2012 19:43

              That looks good Sid, and it does 160 meters, too, which is good as I
              have just bought a V6.2 mono band RXTX off the bay for 160 meters. I
              may well have a bash at one of those, thanks! Can't see me using 6
              meters, as I have no suitable antenna.

              --
              Best Regards,
              Chris Wilson. 2E0ILY

              I don't have a 6m antenna at the moment but a 6m antenna is very easy to build, even a dipole takes up little space.
              73 ... Sid.


              -- 
              Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
              Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
              Senior Staff Specialist, Cricket Coach
              Microsoft Windows Free Zone - Linux used for all Computing Tasks
              
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