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Small RF amps for RXTX Ensemble?

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  • Chris Wilson
    18/08/2012 10:37 What RF amplifiers are people trying with the Softrock RXTX Ensemble? Either as a kit, from plans, or as a ready built device? Looking at
    Message 1 of 15 , Aug 18, 2012
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      18/08/2012 10:37

      What RF amplifiers are people trying with the Softrock RXTX Ensemble?
      Either as a kit, from plans, or as a ready built device? Looking at
      getting maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter
      bands. Thanks.

      --
      Best Regards,
      Chris Wilson. M6DFV
      mailto: chris@...
    • yl2gqn
      Hi, I m use WA2EBY PA with RXTX ensamble. Works great !!!! You can found a lot about this PA in google, one from them is
      Message 2 of 15 , Aug 18, 2012
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        Hi,

        I'm use WA2EBY PA with RXTX ensamble. Works great !!!!
        You can found a lot about this PA in google, one from them is http://www.golddredgervideo.com/kc0wox/wa2ebyamp/

        Regards,
        Andy YL2QN


        --- In softrock40@yahoogroups.com, Chris Wilson <chris@...> wrote:
        >
        >
        >
        > 18/08/2012 10:37
        >
        > What RF amplifiers are people trying with the Softrock RXTX Ensemble?
        > Either as a kit, from plans, or as a ready built device? Looking at
        > getting maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter
        > bands. Thanks.
        >
        > --
        > Best Regards,
        > Chris Wilson. M6DFV
        > mailto: chris@...
        >
      • John Greusel
        Chris, This amp was purpose designed to work with a softrock. I would suggest buying the predrilled heatsink too. It works great and you can order the LPF for
        Message 3 of 15 , Aug 18, 2012
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          Chris,

          This amp was purpose designed to work with a softrock. I would suggest buying the predrilled heatsink too.
          It works great and you can order the LPF for it (with all the parts) from the HF Packer amp site or just create your own. It uses real RF mosfets for the final too.


          John
          KC9oJV


           



          From: Chris Wilson <chris@...>
          To: softrock40@yahoogroups.com
          Sent: Saturday, August 18, 2012 4:41 AM
          Subject: [softrock40] Small RF amps for RXTX Ensemble?



            18/08/2012 10:37

          What RF amplifiers are people trying with the Softrock RXTX Ensemble?
          Either as a kit, from plans, or as a ready built device? Looking at
          getting maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter
          bands. Thanks.

          --
                Best Regards,
                            Chris Wilson.  M6DFV
          mailto: chris@...



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        • Sid Boyce
          ... http://www.qsl.net/k5bcq/Kits/Kits.html *The 20W HF Amplifier Kit #15 160m - 6m. *73 ... Sid. -- Sid Boyce ... Hamradio License G3VBV, Licensed Private
          Message 4 of 15 , Aug 18, 2012
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            On 18/08/12 10:41, Chris Wilson wrote:
            
              18/08/2012 10:37
            
            What RF amplifiers are people trying with the Softrock RXTX Ensemble?
            Either as a kit, from plans, or as a ready built device? Looking at
            getting maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter
            bands. Thanks.
            
            
            http://www.qsl.net/k5bcq/Kits/Kits.html
            The 20W HF Amplifier Kit #15
            160m - 6m.

            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
            
          • sv1eia
            Hi Chris, These have been built by me and my favorite is the first one. 10W PA Highly recommended, easy construction with Mitsubishi RD MOSFETS -
            Message 5 of 15 , Aug 18, 2012
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              Hi Chris,

              These have been built by me and my favorite is the first one.

              10W PA
              Highly recommended, easy construction with Mitsubishi RD MOSFETS
              -> http://qrpproject.de/UK/QRPPA2008UK.html

              10W PA
              -> http://www.kolumbus.fi/juha.niinikoski/10WLinear/10WLinear.htm

              20W PA
              -> http://myweb.tiscali.co.uk/radiokits/radio-related/20W_PA/

              5W PA up to 150MHz
              -> http://www.box73.de/product_info.php?products_id=1899f


              73,
              Christos SV1EIA
              http://groups.yahoo.com/group/powersdr-iq/


              --- In softrock40@yahoogroups.com, Chris Wilson <chris@...> wrote:
              >
              >
              >
              > 18/08/2012 10:37
              >
              > What RF amplifiers are people trying with the Softrock RXTX Ensemble?
              > Either as a kit, from plans, or as a ready built device? Looking at
              > getting maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter
              > bands. Thanks.
              >
              > --
              > Best Regards,
              > Chris Wilson. M6DFV
              > mailto: chris@...
              >
            • AI2Q
              Andy, the G6ALU amplifier, using MOSFETs, works really nicely. Easy to build, too. I etched my own PCB for it, using the image in the docs file. Photo
              Message 6 of 15 , Aug 18, 2012
              Andy, the G6ALU amplifier, using MOSFETs, works really nicely. Easy to build, too.  I etched my own PCB for it, using the image in the docs file.
               
              Photo attached.
               
              I use mine as an IPA to drive my EB-104 MRF-150 amplifier to 600W output from a homebrew G3XJP all-band 160-10M transceiver. I highly recommend the design.
               
               
              Vy 73, AI2Q, Alex
              Member: ARRL, FOC, RSGB, CWops, QRP-L, Antique Wireless Association, New England Radio Discussion Society, DXCC Honor Roll, 16ØM DXCC, 8ØM DXCC
              http://home.roadrunner.com/~alexmm
               
               
               
               
               
              ----- Original Message -----
              From: yl2gqn
              Sent: Saturday, August 18, 2012 7:15 AM
              Subject: [softrock40] Re: Small RF amps for RXTX Ensemble?

               

              Hi,

              I'm use WA2EBY PA with RXTX ensamble. Works great !!!!
              You can found a lot about this PA in google, one from them is http://www.golddredgervideo.com/kc0wox/wa2ebyamp/

              Regards,
              Andy YL2QN

              --- In softrock40@yahoogroups.com, Chris Wilson <chris@...> wrote:
              >
              >
              >
              > 18/08/2012 10:37
              >
              > What RF amplifiers are people trying with the Softrock RXTX Ensemble?
              > Either as a kit, from plans, or as a ready built device? Looking at
              > getting maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter
              > bands. Thanks.
              >
              > --
              > Best Regards,
              > Chris Wilson. M6DFV
              > mailto: chris@...
              >

            • Peter Johnson
              Hi Christos. ... How did you modify the front end of the above amp as its drive requirments are very low for softrock use. Did you remove the the first stage
              Message 7 of 15 , Aug 18, 2012
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                Hi Christos.
                On 18/08/2012 14:53, sv1eia wrote:
                >
                > 20W PA
                > -> http://myweb.tiscali.co.uk/radiokits/radio-related/20W_PA/
                >
                How did you modify the front end of the above amp as its drive
                requirments are very low for softrock use.
                Did you remove the the first stage or just increase the attenuation.

                Regards Peter F1VKK
              • sv1eia
                Hi Peter, Almost all of those qrp pa s have low input, so I used a simple attenuator pad. On some early experiments I bypassed the two BS170 of the softrocks
                Message 8 of 15 , Aug 18, 2012
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                  Hi Peter,

                  Almost all of those qrp pa's have low input, so I used a simple attenuator pad.
                  On some early experiments I bypassed the two BS170 of the softrocks and get the out from 2N2222 to feed the PAs.

                  73,
                  Christos SV1EIA


                  --- In softrock40@yahoogroups.com, Peter Johnson <m1bcv@...> wrote:
                  >
                  > Hi Christos.
                  > On 18/08/2012 14:53, sv1eia wrote:
                  > >
                  > > 20W PA
                  > > -> http://myweb.tiscali.co.uk/radiokits/radio-related/20W_PA/
                  > >
                  > How did you modify the front end of the above amp as its drive
                  > requirments are very low for softrock use.
                  > Did you remove the the first stage or just increase the attenuation.
                  >
                  > Regards Peter F1VKK
                  >
                • sv1eia
                  Jerry, You can do it your own way, nobody stops you. Since you have spoken though about throw away RF, its the same as when you remove the first stages of the
                  Message 9 of 15 , Aug 18, 2012
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                    Jerry,

                    You can do it your own way, nobody stops you.

                    Since you have spoken though about throw away RF, its the same as when you remove the first stages of the PA, exactly the same, you also throw away RF there mate if you remove it.
                    You need to see though which stage introduces the largest IMD.. so to rectify it since we talk about PAs.

                    73,
                    Christos SV1EIA


                    --- In softrock40@yahoogroups.com, "Jerry Kaidor" <jerry@...> wrote:
                    >
                    > > Hi Peter,
                    > >
                    > > Almost all of those qrp pa's have low input, so I used a simple attenuator
                    > > pad.
                    >
                    > *** How about modifying one of those PAs and building it without the input
                    > stage? Seems a shame to throw away RF.
                    >
                    > - Jerry Kaidor, KF6VB
                    >
                  • Jerry Kaidor
                    ... *** How about modifying one of those PAs and building it without the input stage? Seems a shame to throw away RF. - Jerry Kaidor, KF6VB
                    Message 10 of 15 , Aug 18, 2012
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                      > Hi Peter,
                      >
                      > Almost all of those qrp pa's have low input, so I used a simple attenuator
                      > pad.

                      *** How about modifying one of those PAs and building it without the input
                      stage? Seems a shame to throw away RF.

                      - Jerry Kaidor, KF6VB
                    • sv1eia
                      ..whatever
                      Message 11 of 15 , Aug 18, 2012
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                        ..whatever


                        --- In softrock40@yahoogroups.com, "Jerry Kaidor" <jerry@...> wrote:
                        >
                        > > Jerry,
                        > >
                        > > You can do it your own way, nobody stops you.
                        > >
                        > > Since you have spoken though about throw away RF, its the same as when you
                        > > remove the first stages of the PA, exactly the same, you also throw away
                        > > RF there mate if you remove it.
                        >
                        > *** No, you don't throw away RF that way - because you never created it in
                        > the first place. As far as removing the stage from the Softrock - that's
                        > all tied in with the rcv/xmit switching of the transceiver ( in my case
                        > RXTX Ensemble ). If one is building a PA from scratch, it seems simpler
                        > to
                        > just build the right one.
                        >
                        > Every amplification stage introduces distortion and noise. All else
                        > being equal, it seems a better design practice to get by with less
                        > stages, rather than throw away RF ( so you get to use more stages ).
                        >
                        > - Jerry Kaidor, KF6VB
                        >
                      • Jerry Kaidor
                        ... *** No, you don t throw away RF that way - because you never created it in the first place. As far as removing the stage from the Softrock - that s all
                        Message 12 of 15 , Aug 18, 2012
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                          > Jerry,
                          >
                          > You can do it your own way, nobody stops you.
                          >
                          > Since you have spoken though about throw away RF, its the same as when you
                          > remove the first stages of the PA, exactly the same, you also throw away
                          > RF there mate if you remove it.

                          *** No, you don't throw away RF that way - because you never created it in
                          the first place. As far as removing the stage from the Softrock - that's
                          all tied in with the rcv/xmit switching of the transceiver ( in my case
                          RXTX Ensemble ). If one is building a PA from scratch, it seems simpler
                          to
                          just build the right one.

                          Every amplification stage introduces distortion and noise. All else
                          being equal, it seems a better design practice to get by with less
                          stages, rather than throw away RF ( so you get to use more stages ).

                          - Jerry Kaidor, KF6VB
                        • MIKE DURKIN
                          That link is outdated and redirects to MKARS80 Transceiver kit, Do you have an updated link? If the two BS170 s are bypassed... the drive must be close to what
                          Message 13 of 15 , Aug 18, 2012
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                            That link is outdated and redirects to MKARS80 Transceiver kit,
                            Do you have an updated link?

                            If the two BS170's are bypassed... the drive must be close to what a UHFSDR is ...?

                            Mike KC7NOA


                            To: softrock40@yahoogroups.com
                            From: sv1eia@...
                            Date: Sat, 18 Aug 2012 16:04:34 +0000
                            Subject: [softrock40] Re: Small RF amps for RXTX Ensemble?

                             
                            Hi Peter,

                            Almost all of those qrp pa's have low input, so I used a simple attenuator pad.
                            On some early experiments I bypassed the two BS170 of the softrocks and get the out from 2N2222 to feed the PAs.

                            73,
                            Christos SV1EIA

                            --- In softrock40@yahoogroups.com, Peter Johnson <m1bcv@...> wrote:
                            >
                            > Hi Christos.
                            > On 18/08/2012 14:53, sv1eia wrote:
                            > >
                            > > 20W PA
                            > > -> http://myweb.tiscali.co.uk/radiokits/radio-related/20W_PA/
                            > >
                            > How did you modify the front end of the above amp as its drive
                            > requirments are very low for softrock use.
                            > Did you remove the the first stage or just increase the attenuation.
                            >
                            > Regards Peter F1VKK
                            >


                          • Jim Smith
                            Hi Mike, Try http://www.radio-kits.co.uk/ scroll left hand frame to G6ALU s Private Pages then click on 20W FET PA. I built one for my Pic-A-Star transceiver,
                            Message 14 of 15 , Aug 19, 2012
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                              Hi Mike,

                              Try http://www.radio-kits.co.uk/ scroll left hand frame to G6ALU's
                              Private Pages then click on 20W FET PA.

                              I built one for my Pic-A-Star transceiver, works fb.

                              73

                              Jim - G3ZQC

                              MIKE DURKIN wrote:
                              >
                              >
                              > That link is outdated and redirects to MKARS80 Transceiver kit,
                              > Do you have an updated link?
                              >
                              > snip...
                            • Mike Loebl
                              We have a kit currently in beta testing by a few members on the SR list: http://www.hobbypcb.com/amateur-radio/amateur-radio/hardrock-50-hf-power-amp -kit.html
                              Message 15 of 15 , Aug 19, 2012
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                                We have a kit currently in beta testing by a few members on the SR list:
                                http://www.hobbypcb.com/amateur-radio/amateur-radio/hardrock-50-hf-power-amp
                                -kit.html
                                and soon in a barebones kit will be offered without case, etc:
                                http://www.hobbypcb.com/amateur-radio/amateur-radio/barebones-hardrock-50-ki
                                t.html

                                160 - 6m, .5 or 5w drive options, 40-50W on 160-10M, 30-35W on 6M, and an
                                open source firmware...
                                http://code.google.com/p/hardrock-50/

                                It's based on Jim Veatch's (WA2EUJ) ARRL Homebrew Challenge winner.

                                -Mike
                                KB1MTS

                                -----Original Message-----
                                From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On
                                Behalf Of Chris Wilson
                                Sent: Saturday, August 18, 2012 5:41 AM
                                To: softrock40@yahoogroups.com
                                Subject: [softrock40] Small RF amps for RXTX Ensemble?



                                18/08/2012 10:37

                                What RF amplifiers are people trying with the Softrock RXTX Ensemble?
                                Either as a kit, from plans, or as a ready built device? Looking at getting
                                maybe 10 Watts or so. I am building mine for 30, 20 and 17 meter bands.
                                Thanks.

                                --
                                Best Regards,
                                Chris Wilson. M6DFV
                                mailto: chris@...



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