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Re: [softrock40] Re: Amp kit for Softrock Ensemble RXTX II

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  • Adam Jacobs
    Another (much cheaper) option is the Ramsey monoband QRP linear amplifier kits at $45:
    Message 1 of 21 , Jun 20, 2013
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      Another (much cheaper) option is the Ramsey monoband QRP linear amplifier kits at $45:
      http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP

      Unfortunately, they require about a $20 mouser order to modify them into an actual working amplifier. The amplifier as designed is garbage. But still, $65 for a 20w amplifier including enclosure is not a bad deal.

      -73 Adam W7QI


      On 6/20/2013 7:45 AM, James wrote:
       

      I get 30 watts out with the HF Packer.
      http://www.hfprojectsyahoo.com/hf-packeramp.html

      I'm still concerned about in-band spurious emissions from the Ensemble that get amplified as well. Has anyone put theirs on a spectrum analyzer to check this out?

      Jim/ND6P

      --- In softrock40@yahoogroups.com, Chuck Wain <chuckwain@...> wrote:
      >
      > I am about half way through building my Ensemble kit. I would like to make real use of it as a transceiver, but at 1W output that will be a challenge. Does anyone make an amp kit that will work with the Ensemble to boost the output into the 100W range?
      > Thanks
      > Chuck
      > KF7ZQN
      >


    • Bob Macklin
      What do you have to do to the Ramey amplifier? Is there documentation? Bob Macklin K5MYJ Seattle, Wa. Real Radios Glow In The Dark ... From: Adam Jacobs To:
      Message 2 of 21 , Jun 20, 2013
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        What do you have to do to the Ramey amplifier?
         
        Is there documentation?
         
        Bob Macklin
        K5MYJ
        Seattle, Wa.
        "Real Radios Glow In The Dark"
        ----- Original Message -----
        Cc: James
        Sent: Thursday, June 20, 2013 10:04 AM
        Subject: Re: [softrock40] Re: Amp kit for Softrock Ensemble RXTX II

        Another (much cheaper) option is the Ramsey monoband QRP linear amplifier kits at $45:
        http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP

        Unfortunately, they require about a $20 mouser order to modify them into an actual working amplifier. The amplifier as designed is garbage. But still, $65 for a 20w amplifier including enclosure is not a bad deal.

        -73 Adam W7QI


        On 6/20/2013 7:45 AM, James wrote:
         

        I get 30 watts out with the HF Packer.
        http://www.hfprojectsyahoo.com/hf-packeramp.html

        I'm still concerned about in-band spurious emissions from the Ensemble that get amplified as well. Has anyone put theirs on a spectrum analyzer to check this out?

        Jim/ND6P

        --- In softrock40@yahoogroups.com, Chuck Wain <chuckwain@...> wrote:
        >
        > I am about half way through building my Ensemble kit. I would like to make real use of it as a transceiver, but at 1W output that will be a challenge. Does anyone make an amp kit that will work with the Ensemble to boost the output into the 100W range?
        > Thanks
        > Chuck
        > KF7ZQN
        >


      • Adam Jacobs
        All of the modifications are documented in the eQSL review comments for the kits. It s a little bit ala-carte, but the biggest modifications are that it needs
        Message 3 of 21 , Jun 20, 2013
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          All of the modifications are documented in the eQSL review comments for the kits. It's a little bit ala-carte, but the biggest modifications are that it needs (much) better heatsinks for the finals and it needs to have the bias fixed for the finals. There are some other mods that are good ideas - the TX/RX relay is chattery sometimes, so you can replace the capacitor to make the response slower.. Replacing the cheap finals with IRF510 (pin-compatible) is a great idea as well. Have a look at the eqsl comments and you'll get a feeling for what I'm talking about.

          -73 Adam W7QI

          On 6/20/2013 10:15 AM, Bob Macklin wrote:
           

          What do you have to do to the Ramey amplifier?
           
          Is there documentation?
           
          Bob Macklin
          K5MYJ
          Seattle, Wa.
          "Real Radios Glow In The Dark"
          ----- Original Message -----
          Cc: James
          Sent: Thursday, June 20, 2013 10:04 AM
          Subject: Re: [softrock40] Re: Amp kit for Softrock Ensemble RXTX II

          Another (much cheaper) option is the Ramsey monoband QRP linear amplifier kits at $45:
          http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP

          Unfortunately, they require about a $20 mouser order to modify them into an actual working amplifier. The amplifier as designed is garbage. But still, $65 for a 20w amplifier including enclosure is not a bad deal.

          -73 Adam W7QI


          On 6/20/2013 7:45 AM, James wrote:
           

          I get 30 watts out with the HF Packer.
          http://www.hfprojectsyahoo.com/hf-packeramp.html

          I'm still concerned about in-band spurious emissions from the Ensemble that get amplified as well. Has anyone put theirs on a spectrum analyzer to check this out?

          Jim/ND6P

          --- In softrock40@yahoogroups.com, Chuck Wain <chuckwain@...> wrote:
          >
          > I am about half way through building my Ensemble kit. I would like to make real use of it as a transceiver, but at 1W output that will be a challenge. Does anyone make an amp kit that will work with the Ensemble to boost the output into the 100W range?
          > Thanks
          > Chuck
          > KF7ZQN
          >



        • richard.lawn@ymail.com
          Can you point me in the direction of these mods. Tnx Rick W2JAZ
          Message 4 of 21 , Jun 21, 2013
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            Can you point me in the direction of these mods.
            Tnx
            Rick
            W2JAZ

            --- In softrock40@yahoogroups.com, Adam Jacobs <jacobs.adam@...> wrote:
            >
            > Another (much cheaper) option is the Ramsey monoband QRP linear
            > amplifier kits at $45:
            > http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP
            >
            > Unfortunately, they require about a $20 mouser order to modify them into
            > an actual working amplifier. The amplifier as designed is garbage. But
            > still, $65 for a 20w amplifier including enclosure is not a bad deal.
            >
            > -73 Adam W7QI
            >
            >
            > On 6/20/2013 7:45 AM, James wrote:
            > >
            > > I get 30 watts out with the HF Packer.
            > > http://www.hfprojectsyahoo.com/hf-packeramp.html
            > >
            > > I'm still concerned about in-band spurious emissions from the Ensemble
            > > that get amplified as well. Has anyone put theirs on a spectrum
            > > analyzer to check this out?
            > >
            > > Jim/ND6P
            > >
            > > --- In softrock40@yahoogroups.com
            > > <mailto:softrock40%40yahoogroups.com>, Chuck Wain <chuckwain@> wrote:
            > > >
            > > > I am about half way through building my Ensemble kit. I would like
            > > to make real use of it as a transceiver, but at 1W output that will be
            > > a challenge. Does anyone make an amp kit that will work with the
            > > Ensemble to boost the output into the 100W range?
            > > > Thanks
            > > > Chuck
            > > > KF7ZQN
            > > >
            > >
            > >
            >
          • Sid Boyce
            A very well designed 20W PA kit see http://www.qsl.net/k5bcq/Kits/Kits.html Kit #15 will take 1W in for 20W out and covers 160m - 6m and includes RX/TX
            Message 5 of 21 , Jun 21, 2013
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              A very well designed 20W PA kit see http://www.qsl.net/k5bcq/Kits/Kits.html Kit #15 will take 1W in for 20W out and covers 160m - 6m and includes RX/TX switching either from RF sensing or using S12V from a Softrock.
              73 ... Sid.

              On 21/06/13 13:02, richard.lawn@... wrote:
               

              Can you point me in the direction of these mods.
              Tnx
              Rick
              W2JAZ

              --- In softrock40@yahoogroups.com, Adam Jacobs <jacobs.adam@...> wrote:
              >
              > Another (much cheaper) option is the Ramsey monoband QRP linear
              > amplifier kits at $45:
              > http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP
              >
              > Unfortunately, they require about a $20 mouser order to modify them into
              > an actual working amplifier. The amplifier as designed is garbage. But
              > still, $65 for a 20w amplifier including enclosure is not a bad deal.
              >
              > -73 Adam W7QI
              >
              >
              > On 6/20/2013 7:45 AM, James wrote:
              > >
              > > I get 30 watts out with the HF Packer.
              > > http://www.hfprojectsyahoo.com/hf-packeramp.html
              > >
              > > I'm still concerned about in-band spurious emissions from the Ensemble
              > > that get amplified as well. Has anyone put theirs on a spectrum
              > > analyzer to check this out?
              > >
              > > Jim/ND6P
              > >
              > > --- In softrock40@yahoogroups.com
              > > <mailto:softrock40%40yahoogroups.com>, Chuck Wain <chuckwain@> wrote:
              > > >
              > > > I am about half way through building my Ensemble kit. I would like
              > > to make real use of it as a transceiver, but at 1W output that will be
              > > a challenge. Does anyone make an amp kit that will work with the
              > > Ensemble to boost the output into the 100W range?
              > > > Thanks
              > > > Chuck
              > > > KF7ZQN
              > > >
              > >
              > >
              >



              -- 
              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
              
            • Jerry Gerken
              Hi folks:     I ve been using an AN762 / 140 watt kit for about 6 months now.  I get about 50-60 watts with input directly from my 20/40 RXTX.  The AN762
              Message 6 of 21 , Jun 21, 2013
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                Hi folks:
                    I've been using an AN762 / 140 watt kit for about 6 months now.  I get about 50-60 watts with input directly from my 20/40 RXTX.  The AN762 was built exactly as in the directions - kit was bought from Communications Concepts in Dayton.  Some photos and discussion here:
                                         http://sdrbuzz.com/forum/showthread.php?p=944   
                I also tried putting a 20 watt amp between the RXTX and the AN762-  found that you can raise output to over 100 watts but it makes the adjustment really tricky. 
                Good luck.
              • Sid Boyce
                Interesting, In what way was it tricky? I m hoping to use the K5BCQ 20W amp to drive the AN762. 73 ... Sid. ... -- Sid Boyce ... Hamradio License G3VBV,
                Message 7 of 21 , Jun 21, 2013
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                  Interesting,
                  In what way was it tricky?
                  I'm hoping to use the K5BCQ 20W amp to drive the AN762.
                  73 ... Sid.

                  On 21/06/13 14:20, Jerry Gerken wrote:
                   
                  Hi folks:
                      I've been using an AN762 / 140 watt kit for about 6 months now.  I get about 50-60 watts with input directly from my 20/40 RXTX.  The AN762 was built exactly as in the directions - kit was bought from Communications Concepts in Dayton.  Some photos and discussion here:
                                           http://sdrbuzz.com/forum/showthread.php?p=944   
                  I also tried putting a 20 watt amp between the RXTX and the AN762-  found that you can raise output to over 100 watts but it makes the adjustment really tricky. 
                  Good luck.


                  -- 
                  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
                  
                • jbgerken@ymail.com
                  Hi Sid: I tried 2 different 20 watt amps with the AN762. In both cases I found that I had problems adjusting the output power level. Since I use both SSB
                  Message 8 of 21 , Jun 21, 2013
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                    Hi Sid:

                    I tried 2 different 20 watt amps with the AN762. In both cases I found that I had problems adjusting the output power level. Since I use both SSB (higher power levels) and PSK (lower), readjustment was a problem. Even using the delta44 system (which can store in/out db levels in a file) the power levels required readjustment. Could have been one of several causes- impedance matching or maybe an attenuator could have helped. I sidestepped it by just cutting the 20 watt amp out of the mix- when used alone the AN762 is stable as a rock. Since I'm about to buy a Flex 1500 (5 watt output), I'm not concerned right now. The Flex 5 watt output should drive the AN762 to limit.

                    73 Jerry N5JBG

                    --- In softrock40@yahoogroups.com, Sid Boyce <sboyce@...> wrote:
                    >
                    > Interesting,
                    > In what way was it tricky?
                    > I'm hoping to use the K5BCQ 20W amp to drive the AN762.
                    > 73 ... Sid.
                    >
                    > On 21/06/13 14:20, Jerry Gerken wrote:
                    > > Hi folks:
                    > > I've been using an AN762 / 140 watt kit for about 6 months now. I
                    > > get about 50-60 watts with input directly from my 20/40 RXTX. The
                    > > AN762 was built exactly as in the directions - kit was bought from
                    > > Communications Concepts in Dayton. Some photos and discussion here:
                    > > http://sdrbuzz.com/forum/showthread.php?p=944
                    > > I also tried putting a 20 watt amp between the RXTX and the AN762-
                    > > found that you can raise output to over 100 watts but it makes the
                    > > adjustment really tricky.
                    > > Good luck.
                    > >
                    >
                    >
                    > --
                    > 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
                    >
                  • kb9gpm
                    Here are some details I found on it. I m thinking about getting on to experiment with. http://www.eham.net/reviews/detail/1099
                    Message 9 of 21 , Jun 21, 2013
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                      Here are some details I found on it. I'm thinking about getting on to experiment with.

                      http://www.eham.net/reviews/detail/1099

                      --- In softrock40@yahoogroups.com, "richard.lawn@..." <rjlawn@...> wrote:
                      >
                      > Can you point me in the direction of these mods.
                      > Tnx
                      > Rick
                      > W2JAZ
                      >
                      > --- In softrock40@yahoogroups.com, Adam Jacobs <jacobs.adam@> wrote:
                      > >
                      > > Another (much cheaper) option is the Ramsey monoband QRP linear
                      > > amplifier kits at $45:
                      > > http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP
                      > >
                      > > Unfortunately, they require about a $20 mouser order to modify them into
                      > > an actual working amplifier. The amplifier as designed is garbage. But
                      > > still, $65 for a 20w amplifier including enclosure is not a bad deal.
                      > >
                      > > -73 Adam W7QI
                      > >
                      > >
                      > > On 6/20/2013 7:45 AM, James wrote:
                      > > >
                      > > > I get 30 watts out with the HF Packer.
                      > > > http://www.hfprojectsyahoo.com/hf-packeramp.html
                      > > >
                      > > > I'm still concerned about in-band spurious emissions from the Ensemble
                      > > > that get amplified as well. Has anyone put theirs on a spectrum
                      > > > analyzer to check this out?
                      > > >
                      > > > Jim/ND6P
                      > > >
                      > > > --- In softrock40@yahoogroups.com
                      > > > <mailto:softrock40%40yahoogroups.com>, Chuck Wain <chuckwain@> wrote:
                      > > > >
                      > > > > I am about half way through building my Ensemble kit. I would like
                      > > > to make real use of it as a transceiver, but at 1W output that will be
                      > > > a challenge. Does anyone make an amp kit that will work with the
                      > > > Ensemble to boost the output into the 100W range?
                      > > > > Thanks
                      > > > > Chuck
                      > > > > KF7ZQN
                      > > > >
                      > > >
                      > > >
                      > >
                      >
                    • Chris Wilson
                      ... 21/06/2013 21:56 Whilst you are in the mood for trouble and hassle, will you take my wife off my hands? ;) That s a pretty damning review there! -- Best
                      Message 10 of 21 , Jun 21, 2013
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                        >
                        > Here are some details I found on it. I'm thinking about getting on to experiment with.

                        > http://www.eham.net/reviews/detail/1099



                        21/06/2013 21:56

                        Whilst you are in the mood for trouble and hassle, will you take my
                        wife off my hands? ;) That's a pretty damning review there!

                        --
                        Best Regards,
                        Chris Wilson. 2E0ILY
                      • sdrcrazed
                        There s a detailed buildup article for the Ramsey amp kit with lots of information at http://sdrbuzz.com/forum/showthread.php?t=121. I use this Ramsey
                        Message 11 of 21 , Jun 21, 2013
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                          There's a detailed buildup article for the Ramsey amp kit with lots of information at http://sdrbuzz.com/forum/showthread.php?t=121. I use this Ramsey regularly for PSK operation and have used it successfully with SSB and even AM.
                          There's also some info on the AN762 amp at http://sdrbuzz.com/forum/showthread.php?t=237

                          The Ramsey amp kits are available a bit cheaper at http://boomerssupply.com/shopexd.asp?id=15689

                          Ed KT6F


                          --- In softrock40@yahoogroups.com, Adam Jacobs <jacobs.adam@...> wrote:
                          >
                          > All of the modifications are documented in the eQSL review comments for
                          > the kits. It's a little bit ala-carte, but the biggest modifications are
                          > that it needs (much) better heatsinks for the finals and it needs to
                          > have the bias fixed for the finals. There are some other mods that are
                          > good ideas - the TX/RX relay is chattery sometimes, so you can replace
                          > the capacitor to make the response slower.. Replacing the cheap finals
                          > with IRF510 (pin-compatible) is a great idea as well. Have a look at the
                          > eqsl comments and you'll get a feeling for what I'm talking about.
                          >
                          > -73 Adam W7QI
                          >
                          > On 6/20/2013 10:15 AM, Bob Macklin wrote:
                          > >
                          > > What do you have to do to the Ramey amplifier?
                          > > Is there documentation?
                          > > Bob Macklin
                          > > K5MYJ
                          > > Seattle, Wa.
                          > > "Real Radios Glow In The Dark"
                          > >
                          > > ----- Original Message -----
                          > > *From:* Adam Jacobs <mailto:jacobs.adam@...>
                          > > *To:* softrock40@yahoogroups.com <mailto:softrock40@yahoogroups.com>
                          > > *Cc:* James <mailto:jpkellyburbank@...>
                          > > *Sent:* Thursday, June 20, 2013 10:04 AM
                          > > *Subject:* Re: [softrock40] Re: Amp kit for Softrock Ensemble RXTX II
                          > >
                          > > Another (much cheaper) option is the Ramsey monoband QRP linear
                          > > amplifier kits at $45:
                          > > http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP
                          > >
                          > > Unfortunately, they require about a $20 mouser order to modify
                          > > them into an actual working amplifier. The amplifier as designed
                          > > is garbage. But still, $65 for a 20w amplifier including enclosure
                          > > is not a bad deal.
                          > >
                          > > -73 Adam W7QI
                          > >
                          > >
                          > > On 6/20/2013 7:45 AM, James wrote:
                          > >>
                          > >> I get 30 watts out with the HF Packer.
                          > >> http://www.hfprojectsyahoo.com/hf-packeramp.html
                          > >>
                          > >> I'm still concerned about in-band spurious emissions from the
                          > >> Ensemble that get amplified as well. Has anyone put theirs on a
                          > >> spectrum analyzer to check this out?
                          > >>
                          > >> Jim/ND6P
                          > >>
                          > >> --- In softrock40@yahoogroups.com
                          > >> <mailto:softrock40%40yahoogroups.com>, Chuck Wain <chuckwain@>
                          > >> wrote:
                          > >> >
                          > >> > I am about half way through building my Ensemble kit. I would
                          > >> like to make real use of it as a transceiver, but at 1W output
                          > >> that will be a challenge. Does anyone make an amp kit that will
                          > >> work with the Ensemble to boost the output into the 100W range?
                          > >> > Thanks
                          > >> > Chuck
                          > >> > KF7ZQN
                          > >> >
                          > >>
                          > >
                          > >
                          >
                        • Sid Boyce
                          Thanks Jerry. I wondered if it was a stability issue. I would be using an attenuator between the 1W driver and the 20W PA which has provision for a Pi
                          Message 12 of 21 , Jun 21, 2013
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                            Thanks Jerry.
                            I wondered if it was a stability issue.
                            I would be using an attenuator between the 1W driver and the 20W PA which has provision for a Pi attenuator at its input.
                            73 ... Sid.

                            On 21/06/13 16:49, jbgerken@... wrote:
                             

                            Hi Sid:

                            I tried 2 different 20 watt amps with the AN762. In both cases I found that I had problems adjusting the output power level. Since I use both SSB (higher power levels) and PSK (lower), readjustment was a problem. Even using the delta44 system (which can store in/out db levels in a file) the power levels required readjustment. Could have been one of several causes- impedance matching or maybe an attenuator could have helped. I sidestepped it by just cutting the 20 watt amp out of the mix- when used alone the AN762 is stable as a rock. Since I'm about to buy a Flex 1500 (5 watt output), I'm not concerned right now. The Flex 5 watt output should drive the AN762 to limit.

                            73 Jerry N5JBG

                            --- In softrock40@yahoogroups.com, Sid Boyce <sboyce@...> wrote:
                            >
                            > Interesting,
                            > In what way was it tricky?
                            > I'm hoping to use the K5BCQ 20W amp to drive the AN762.
                            > 73 ... Sid.
                            >
                            > On 21/06/13 14:20, Jerry Gerken wrote:
                            > > Hi folks:
                            > > I've been using an AN762 / 140 watt kit for about 6 months now. I
                            > > get about 50-60 watts with input directly from my 20/40 RXTX. The
                            > > AN762 was built exactly as in the directions - kit was bought from
                            > > Communications Concepts in Dayton. Some photos and discussion here:
                            > > http://sdrbuzz.com/forum/showthread.php?p=944
                            > > I also tried putting a 20 watt amp between the RXTX and the AN762-
                            > > found that you can raise output to over 100 watts but it makes the
                            > > adjustment really tricky.
                            > > Good luck.
                            > >
                            >
                            >
                            >



                            -- 
                            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
                            
                          • Kees & Sandy
                            Adding a 3dB or 6dB attenuator (no less than 3dB) between the driver and the Amplifier does worlds of good in matching the two so they work efficiently with
                            Message 13 of 21 , Jun 21, 2013
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                              Adding a 3dB or 6dB attenuator (no less than 3dB) between the driver and the Amplifier does worlds of good in matching the two so they work efficiently with each other.
                               
                              73 Kees K5BCQ


                              ---------- Original Message ----------
                              From: Sid Boyce <sboyce@...>
                              To: softrock40@yahoogroups.com
                              Subject: Re: [softrock40] Re: Amp kit for Softrock Ensemble RXTX II
                              Date: Fri, 21 Jun 2013 22:21:16 +0100

                               

                              Thanks Jerry.
                              I wondered if it was a stability issue.
                              I would be using an attenuator between the 1W driver and the 20W PA which has provision for a Pi attenuator at its input.
                              73 ... Sid.

                              On 21/06/13 16:49, jbgerken@... wrote:
                               

                              Hi Sid:

                              I tried 2 different 20 watt amps with the AN762. In both cases I found that I had problems adjusting the output power level. Since I use both SSB (higher power levels) and PSK (lower), readjustment was a problem. Even using the delta44 system (which can store in/out db levels in a file) the power levels required readjustment. Could have been one of several causes- impedance matching or maybe an attenuator could have helped. I sidestepped it by just cutting the 20 watt amp out of the mix- when used alone the AN762 is stable as a rock. Since I'm about to buy a Flex 1500 (5 watt output), I'm not concerned right now. The Flex 5 watt output should drive the AN762 to limit.

                              73 Jerry N5JBG

                              --- In softrock40@yahoogroups.com, Sid Boyce <sboyce@...> wrote:
                              >
                              > Interesting,
                              > In what way was it tricky?
                              > I'm hoping to use the K5BCQ 20W amp to drive the AN762.
                              > 73 ... Sid.
                              >
                              > On 21/06/13 14:20, Jerry Gerken wrote:
                              > > Hi folks:
                              > > I've been using an AN762 / 140 watt kit for about 6 months now. I
                              > > get about 50-60 watts with input directly from my 20/40 RXTX. The
                              > > AN762 was built exactly as in the directions - kit was bought from
                              > > Communications Concepts in Dayton. Some photos and discussion here:
                              > > http://sdrbuzz.com/forum/showthread.php?p=944
                              > > I also tried putting a 20 watt amp between the RXTX and the AN762-
                              > > found that you can raise output to over 100 watts but it makes the
                              > > adjustment really tricky.
                              > > Good luck.
                              > >
                              >
                              >
                              >



                              -- 
                              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
                              

                               

                               

                            • jbgerken@ymail.com
                              Sid & Kees : Thanks guys. As soon as I get a chance I may revisit that situation and add attenuation between the RXTX and the amp. I never like to let the
                              Message 14 of 21 , Jun 21, 2013
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                                Sid & Kees :
                                Thanks guys. As soon as I get a chance I may revisit that situation and add attenuation between the RXTX and the amp. I never like to let the electrons get the upper hand.
                                73 Jerry N5JBG

                                --- In softrock40@yahoogroups.com, "Kees & Sandy" <windy10605@...> wrote:
                                >
                                > Adding a 3dB or 6dB attenuator (no less than 3dB) between the driver and the Amplifier does worlds of good in matching the two so they work efficiently with each other. 73 Kees K5BCQ
                                >
                                > ---------- Original Message ----------
                                > From: Sid Boyce <sboyce@...>
                                > To: softrock40@yahoogroups.com
                                > Subject: Re: [softrock40] Re: Amp kit for Softrock Ensemble RXTX II
                                > Date: Fri, 21 Jun 2013 22:21:16 +0100
                                >
                                >
                                >
                                > Thanks Jerry.
                                > I wondered if it was a stability issue.
                                > I would be using an attenuator between the 1W driver and the 20W PA which has provision for a Pi attenuator at its input.
                                > 73 ... Sid.
                                >
                                > On 21/06/13 16:49, jbgerken@... wrote: Hi Sid:
                                >
                                > I tried 2 different 20 watt amps with the AN762. In both cases I found that I had problems adjusting the output power level. Since I use both SSB (higher power levels) and PSK (lower), readjustment was a problem. Even using the delta44 system (which can store in/out db levels in a file) the power levels required readjustment. Could have been one of several causes- impedance matching or maybe an attenuator could have helped. I sidestepped it by just cutting the 20 watt amp out of the mix- when used alone the AN762 is stable as a rock. Since I'm about to buy a Flex 1500 (5 watt output), I'm not concerned right now. The Flex 5 watt output should drive the AN762 to limit.
                                >
                                > 73 Jerry N5JBG
                                >
                                > --- In softrock40@yahoogroups.com, Sid Boyce <sboyce@> wrote:
                                > >
                                > > Interesting,
                                > > In what way was it tricky?
                                > > I'm hoping to use the K5BCQ 20W amp to drive the AN762.
                                > > 73 ... Sid.
                                > >
                                > > On 21/06/13 14:20, Jerry Gerken wrote:
                                > > > Hi folks:
                                > > > I've been using an AN762 / 140 watt kit for about 6 months now. I
                                > > > get about 50-60 watts with input directly from my 20/40 RXTX. The
                                > > > AN762 was built exactly as in the directions - kit was bought from
                                > > > Communications Concepts in Dayton. Some photos and discussion here:
                                > > > http://sdrbuzz.com/forum/showthread.php?p=944
                                > > > I also tried putting a 20 watt amp between the RXTX and the AN762-
                                > > > found that you can raise output to over 100 watts but it makes the
                                > > > adjustment really tricky.
                                > > > Good luck.
                                > > >
                                > >
                                > >
                                > >
                                >
                                >
                                >
                                >
                                >
                                > -- Sid Boyce ... Hamradio License G3VBV, Licensed Private PilotEmeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech SupportSenior Staff Specialist, Cricket CoachMicrosoft Windows Free Zone - Linux used for all Computing Tasks
                                >
                              • OvaEasy
                                I HAVE THE SAME KIT WITH ALL THE FILTERS HEAT SINK ETC. THE PTT NEEDS AN RCA PLUG. JUST WENT THRU EYE SURGERY MY DAYS OF BUILDING ARE OVER, HAVE ANOTHER
                                Message 15 of 21 , Jun 22, 2013
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                                  I HAVE THE SAME KIT WITH ALL THE FILTERS HEAT SINK ETC. THE PTT NEEDS AN RCA PLUG.
                                  JUST WENT THRU EYE SURGERY MY DAYS OF BUILDING ARE OVER, HAVE ANOTHER COMMUNICATIONS CONCEPT AMP FULLY FUNCTIONAL.

                                  MAKE OFFER AND PAY SHIPPING AND YOU WILL BE THE LUCKY WINNER.......
                                  BARRY-WB6LDL
                                  PARDON THE CAPS HARD TO SEE.
                                  CALL FOR FURTHER INFO.
                                  Thank you in advance for your consideration and
                                  reply.

                                  HOME 850-722-0231
                                  CELL 850-814-8339
                                  EMAIL-burro5944@...
                                  THANKS ALL



                                  On 6/21/2013 8:20 AM, Jerry Gerken wrote:
                                   
                                  Hi folks:
                                      I've been using an AN762 / 140 watt kit for about 6 months now.  I get about 50-60 watts with input directly from my 20/40 RXTX.  The AN762 was built exactly as in the directions - kit was bought from Communications Concepts in Dayton.  Some photos and discussion here:
                                                           http://sdrbuzz.com/forum/showthread.php?p=944   
                                  I also tried putting a 20 watt amp between the RXTX and the AN762-  found that you can raise output to over 100 watts but it makes the adjustment really tricky. 
                                  Good luck.

                                • softrookie
                                  Hello there, I have four softrock ensembles tx/rx and I use a wa2eby amp. The boards are on eBay for 20$ the rest is in Mouser ele.for 75$.Its a 24 volt
                                  Message 16 of 21 , Jun 22, 2013
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                                    Hello there, I have four softrock ensembles tx/rx and I use a wa2eby amp. The boards are on eBay for 20$ the rest is in Mouser ele.for 75$.Its a 24 volt push/pull config,1=45 I get 55 watts on 40-80 45 watts on 10-20..I then drive an ameritron 811 and get 600 watts of clean rf no problems.....All of my legacy radios are in the box.Good luck
                                    --- In softrock40@yahoogroups.com, "kb9gpm" <goofy_36@...> wrote:
                                    >
                                    > Here are some details I found on it. I'm thinking about getting on to experiment with.
                                    >
                                    > http://www.eham.net/reviews/detail/1099
                                    >
                                    > --- In softrock40@yahoogroups.com, "richard.lawn@" <rjlawn@> wrote:
                                    > >
                                    > > Can you point me in the direction of these mods.
                                    > > Tnx
                                    > > Rick
                                    > > W2JAZ
                                    > >
                                    > > --- In softrock40@yahoogroups.com, Adam Jacobs <jacobs.adam@> wrote:
                                    > > >
                                    > > > Another (much cheaper) option is the Ramsey monoband QRP linear
                                    > > > amplifier kits at $45:
                                    > > > http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=QAMP
                                    > > >
                                    > > > Unfortunately, they require about a $20 mouser order to modify them into
                                    > > > an actual working amplifier. The amplifier as designed is garbage. But
                                    > > > still, $65 for a 20w amplifier including enclosure is not a bad deal.
                                    > > >
                                    > > > -73 Adam W7QI
                                    > > >
                                    > > >
                                    > > > On 6/20/2013 7:45 AM, James wrote:
                                    > > > >
                                    > > > > I get 30 watts out with the HF Packer.
                                    > > > > http://www.hfprojectsyahoo.com/hf-packeramp.html
                                    > > > >
                                    > > > > I'm still concerned about in-band spurious emissions from the Ensemble
                                    > > > > that get amplified as well. Has anyone put theirs on a spectrum
                                    > > > > analyzer to check this out?
                                    > > > >
                                    > > > > Jim/ND6P
                                    > > > >
                                    > > > > --- In softrock40@yahoogroups.com
                                    > > > > <mailto:softrock40%40yahoogroups.com>, Chuck Wain <chuckwain@> wrote:
                                    > > > > >
                                    > > > > > I am about half way through building my Ensemble kit. I would like
                                    > > > > to make real use of it as a transceiver, but at 1W output that will be
                                    > > > > a challenge. Does anyone make an amp kit that will work with the
                                    > > > > Ensemble to boost the output into the 100W range?
                                    > > > > > Thanks
                                    > > > > > Chuck
                                    > > > > > KF7ZQN
                                    > > > > >
                                    > > > >
                                    > > > >
                                    > > >
                                    > >
                                    >
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