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Re: 5w amplifier

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  • 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 1 of 12 , Nov 15, 2012
      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 2 of 12 , Nov 15, 2012
        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 3 of 12 , Nov 15, 2012
          > 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 4 of 12 , Nov 15, 2012
            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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