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43650Re: [softrock40] Re: PA Kits for the Softrock V6.3 RXTX

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  • Sid Boyce
    May 3, 2010
      On 03/05/10 16:48, n4fbz wrote:
      >
      >
      > Well, as I remember (I'd have to take the softrock apart and check
      > things), I used the T37-6 (10 meter) core, and wound it bifilar. That
      > was in place of the bandpass filter. I don't remember exactly what I
      > came up in place of the transmit section, but I did match things up.
      >
      > You see, last month my shop burned- and I lost all of my notes and test
      > equipment I'd collected over the last 25 years, and parts (no insurance,
      > total loss, and all of my friends consider the fire suspicious- I'm not
      > popular in this area). I'd had all of the notes regarding the softrock
      > out there where I'd built it, including research and calculations.
      >
      Bad news on the fire. That stuff is not easy to replace, the notes and
      calculations possibly are irreplaceable.
      73 ... Sid.

      > --- In softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>,
      > Sid Boyce <sboyce@...> wrote:
      >>
      >> 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>
      >> > <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> <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> <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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