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69624Re: [softrock40] Peaberry using PowerSDR2.4.4 I/Q Reverse on TX only

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  • David Turnbull
    Oct 31, 2012
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      Thanks, John,

      Your observations exactly match mine. I wired my RXTX for PowerSDR and use a "reversing cable" for Rocky.

      I think it's possible that somewhere along the way Rocky changed so I'm hoping someone who doesn't need to switch IQ will report their version numbers. This confuses everyone getting started with homebrew SDR so it'd be nice to figure out where things went sideways.

      73 David AE9RB

      On Wed, Oct 31, 2012 at 10:27 AM, John Williams <KE5SSH@...> wrote:

      I got my RXTX pre-built from Tony and he said he tested it on Rocky. He wired it RX straight and TX crossed. To get it to work on PSDR, I made a cable that crosses RX.

      Confusing, but that is what I have.


      On 10/31/2012 11:45 AM, David Turnbull wrote:


      The following two paragraphs from from

      "In both the RX op amp and TX QSE sections, the jumper links on the
      I/Q input and outputs should ideally be fitted crossed over. That
      provides compatibility with all versions of PowerSDR. For Rocky and
      Winrad it is necessary to use the 'swap IQ' functions in their set up.
      If you jumper them straight across fine for Rocky and Winrad, but you
      will not be able to use any version of PSDR. (Author wired for Rocky)"

      "Some builders (author included) have encountered issues in this setup
      and siscovered that the only the TX leads should be crossed, leaving
      the RX leads uncrossed. Be prepared to change these should you
      encounter this issue."

      I own a SoftRock RXTX Ensemble and wiring them as per the first
      paragraph, with both crossed, left me in a situation where Rocky was
      impossible to set up. Making the change in the second paragraph allows
      use on Rocky, but PowerSDR was impossible.

      I have tested many different applications with the Peaberry and would
      love a design that didn't require i/Q reversal. Unfortunately, this
      doesn't seem possible when two very popular applications appear in
      direct conflict with each other and are inflexible with their

      To everyone who transmits with both PowerSDR and Rocky on a RXTX
      Ensemble: What versions are you using? How are your jumpers set up?

      73 David AE9RB

      On Tue, Oct 30, 2012 at 11:15 PM, Alan <alan4alan@...> wrote:
      > ----- Original Message -----
      > Subject: Re: [softrock40] Peaberry using PowerSDR2.4.4 I/Q Reverse on TX only
      >> Alan, Rocky's I/Q reversal toggles both the tx and rx. The RX_REV
      >> reverses only the receiver. Without the jumper, one or the other is
      >> always wrong in Rocky. No other software needs this jumper as they
      >> either use the PowerSDR setup or have separate config options for rx
      >> and tx.
      > David
      > With the Softrocks it has always been the case that if the IQ is setup for PSDR RXTX then the software switch was all that was
      > needed for Rocky.
      > As no-one has mentioned any changes with PSDR I assume that the IQ settings have not changed. So the latest version should not be
      > any different.
      > I forget which software needs the software switch but once a Softrock is setup correctly it does not need to be changed. It seems
      > strange that you say the Peaberry requires a RX switch.
      > 73 Alan G4ZFQ
      > ------------------------------------
      > Yahoo! Groups Links

      John Williams
      KE5SSH - ham since 2007
      WQKA523 - GMRS for family use on the farm

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