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Re: [softrock40] Re: SR6 signal levels

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  • FRANCIS CARCIA
    That is what I found. The OP amp gain jacks the signal to sound card saturation. Bill Tracey wrote: Probably the sound card started
    Message 1 of 21 , Jun 1, 2006
      That is what I found. The OP amp gain jacks the signal to sound card saturation.

      Bill Tracey <kd5tfd@...> wrote:
      Probably the sound card started saturating above -40 dbm -- the SR 6
      hardware I've measured will produce a 4.5Vpp signal with a -18 dbm input
      signal  on 7 MHz.  Suspect the sound card saturates long before that.

      Cheers,

      Bill (kd5tfd)

      At 06:48 PM 6/1/2006, Alberto I2PHD wrote:
      > > Signal (dBm)   Winrad display (dB)   Comment
      > > ------------   -------------------   -------
      > > -32             0                    multiple harmonics visible
      > > -32.2          -2                    S8
      > > -40            -5                    S7
      > > -50            -15                   S6
      > > -60            -25                   S5
      >---- snip ----
      >
      >Something went in saturation above -40 dBm....probably the opamps or the
      >sound card.
      >
      >73  Alberto  I2PHD




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    • Sparkes, John
      Well, according to ONE, anyway...!________________________________From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of KD5NWA
      Message 2 of 21 , Jun 1, 2006
        Well, according to ONE, anyway...!


        From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of KD5NWA
        Sent: Friday, 2 June 2006 02:17
        To: softrock40@yahoogroups.com
        Cc: softrock40@yahoogroups.com
        Subject: Re: [softrock40] phase noise

        According to some, phase noise and jitter is a vast conspiracy.

        At 11:49 AM 6/1/2006, Bill Dumke wrote:
        >Francis,
        >
        >Thank you for posting that. 
        Personally, I believe that is the biggest
        >single problem with these SDR
        type radios.
        >
        >Bill  WB5TCO
        >
        >FRANCIS CARCIA
        wrote:
        >
        > > I just found a good article on measuring phase
        noise. I have used the
        > > one with a mixer and HP8640B. It is uploaded
        into the file area.  gfz
        > >
        > >
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        LINKS
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        >
        > >
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        Cecil Bayona
        KD5NWA
        www.qrpradio.com

        "Windows, the most successful software virus ever" Don Seglio Batuna


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      • Robert Campbell
        Thanks, guys. Looks like the perfomance is OK and I haven t messed up in construction. I figured the harmonics were down to overdriving the soundcard input.
        Message 3 of 21 , Jun 2, 2006
          Thanks, guys.

          Looks like the perfomance is OK and I haven't messed
          up in construction. I figured the harmonics were down
          to overdriving the soundcard input.

          Just need to see what it does with an antenna now :-)

          Rob GM6OQN

          --- FRANCIS CARCIA <carcia@...> wrote:

          > That is what I found. The OP amp gain jacks the
          > signal to sound card saturation.
          >
          > Bill Tracey <kd5tfd@...> wrote: Probably the
          > sound card started saturating above -40 dbm -- the
          > SR 6
          > hardware I've measured will produce a 4.5Vpp signal
          > with a -18 dbm input
          > signal on 7 MHz. Suspect the sound card saturates
          > long before that.
          >
          > Cheers,
          >
          > Bill (kd5tfd)
          >
          > At 06:48 PM 6/1/2006, Alberto I2PHD wrote:
          > > > Signal (dBm) Winrad display (dB) Comment
          > > > ------------ ------------------- -------
          > > > -32 0 multiple
          > harmonics visible
          > > > -32.2 -2 S8
          > > > -40 -5 S7
          > > > -50 -15 S6
          > > > -60 -25 S5
          > >---- snip ----
          > >
          > >Something went in saturation above -40
          > dBm....probably the opamps or the
          > >sound card.
          > >
          > >73 Alberto I2PHD
          >
          >
          >
          >
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