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

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  • 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 1 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 2 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 3 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$.Its a 24 volt
          Message 4 of 21 , Jun 22, 2013
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            Hello there, I have four softrock ensembles tx/rx and I use a wa2eby amp. The boards are on eBay for 20$ 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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