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43632Re: [softrock40] Re: PA Kits for the Softrock V6.3 RXTX

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  • Sid Boyce
    May 2, 2010
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      On 02/05/10 18:59, n4fbz wrote:
      > I modified my softrock so that it has a broadband balun for both tx and
      > rx, and I'm working on an external amp (using the kit from Kits and
      > Parts http://www.kitsandparts.com/linearamp.php
      > <http://www.kitsandparts.com/linearamp.php>) that takes the output from
      > the mixers, puts the signal through a bandpass filter (built into the
      > amp box), and then outputs the signal (through more filtering).
      Details of the balun? I tested a small BN-43-2402 (or similar) with 8 or
      10 bifilar turns between the SR v6.3 and the antenna. It seemed OK, then
      I tried without it, but with the SO239 isolated from the chassis. Purely
      empirical the whole exercise, no difference observed.

      > I also incorporated a receive preamp in the circuit that should
      > eliminate a lot of the rx problems I've heard about (but only experience
      > to a small amount). The goal? Have a QRP rig that out performs and is
      > cleaner than anything available through the "market"- and I think that
      > might end up being the case!
      > The whole idea was to build a modular system. Seperate softrock that can
      > be used (plugged in) to many different setups and circuits. External
      > filtering as needed. External amp as well. I can also by switching
      > cables use my softrock as an IF receiver, or as the basis of a nice
      > transverter-style 2m SSB system... or for any number of applications.
      > BTW- The softrock was built into a nice rf-tight case with feedthroughs
      > and very strong isolation of any noise source, as well as proper
      > audio-type grounding (single point). That makes it an awesome receiver
      > even without the impedance-matching preamp, and I'm looking forward to
      > seeing how it works on transmit!
      Good practice for any radio gear and with digital circuits in close
      proximity I tend to use lots of ferrite on external leads also. On the
      SRv6.3 + E-MU 0404 USB with 2m of very heavy figure-of-8 audio cables, I
      have 3 rather large ferrite rings.

      > (I just wish that they'd port Rocky to Linux, and add SSB capacity to
      > the software!)
      You stand as much chance of having Rocky ported as you have of being
      struck by lightning down a coal mine. Flex promised way back to port
      PowerSDR to Linux, but since have been silent whenever the topic is raised.

      > Bob
      > N4FBZ
      73 ... Sid.

      > --- In softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>,
      > Preston Douglas <pdouglas12@...> wrote:
      >> Chris,
      >> I have the Packer Amp with my RXTX 6.3. Per alternate instructions,
      > changed the input attenuator to 1dB, and I get 15-20 watts out LINEAR
      > from about 500 mW input from the RXTX. Really gets out well.
      >> Preston Douglas WJ2V
      >> -----Original Message-----
      >> From: Chris Morin <gtppilot20@...>
      >> To: softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>
      >> Sent: Sat, May 1, 2010 2:08 pm
      >> Subject: [softrock40] Re: PA Kits for the Softrock V6.3 RXTX
      >> WOW. Very cool. I have just started making contacts with my 6.3 as
      > well. Sans amp unfortunately.
      >> Thanks for the HF Projects mention. Exactly what I have been looking
      > for !!! Nice !!!
      >> Assuming things keep going well with the 6.3 I may go for the
      > Superpacker Pro as a project for next winter.
      >> QRP is not really my cup of tea, but I do love operating my softrock.
      >> >I finally have the Softrock V6.3 RXTX on the air. I am using the
      > PowerSDR V1.19.3.15 software and added >a small 12Vdc relay to kill the
      > transmitted audio that gets into the speaker with an annonying delay.
      >> >My setup uses the Soundblaster Live 24bit USB for receive and the
      > laptop sound card for transmit audio.
      >> >I have build the 5W RF amp from Virgil at HF Projects and have been
      > having fun making contacts on >80/40M.
      >> >Thanks Steve N9HE

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