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Re: [softrock40] Re: SR6 signal levels

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  • Bill Tracey
    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.
    Message 1 of 21 , Jun 1, 2006
      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
    • 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 2 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 3 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
          > >
          > >
          > > SPONSORED
          LINKS
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          href="http://groups.yahoo.com/gads?t=ms&k=Ham+radio&w1=Ham+radio&c=1&s=15&.sig=t8IpznzYq-E2LbCrDXaGPQ">http://groups.yahoo.com/gads?t=ms&k=Ham+radio&w1=Ham+radio&c=1&s=15&.sig=t8IpznzYq-E2LbCrDXaGPQ>
          >
          > >
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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 4 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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