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Re: [softrock40] SSB demod, was Re: carrirer oscillator

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  • Bill Tracey
    When tuning an SDR 1000, if spur reduction is turned off, the DDS is tuner 11025 khz below the frequency of interest and the software (DttSP) oscillator is set
    Message 1 of 31 , Oct 1, 2005
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      When tuning an SDR 1000, if spur reduction is turned off, the DDS is tuner
      11025 khz below the frequency of interest and the software (DttSP)
      oscillator is set to -11025 khz to recover the frequency of interest. This
      works well but for the spurs from the DDS.

      If spur reduction is turned on (the normal case) the DDS is tuned to the
      nearest low spur point (as documented by some of the AD docs) and then
      DttSP oscillator is set to an appropriate value to recover the signal of
      interest. This generally results in a DttSP oscillator value between -9.5
      and -12.5 khz.

      On the SoftRock all the tuning is done with the DttSP oscillator and it
      ranges over +/- 24 khz - giving a tuning range of 48 khz.

      Regards,

      Bill (kd5tfd)
    • Bill Tracey
      When tuning an SDR 1000, if spur reduction is turned off, the DDS is tuner 11025 khz below the frequency of interest and the software (DttSP) oscillator is set
      Message 31 of 31 , Oct 1, 2005
      • 0 Attachment
        When tuning an SDR 1000, if spur reduction is turned off, the DDS is tuner
        11025 khz below the frequency of interest and the software (DttSP)
        oscillator is set to -11025 khz to recover the frequency of interest. This
        works well but for the spurs from the DDS.

        If spur reduction is turned on (the normal case) the DDS is tuned to the
        nearest low spur point (as documented by some of the AD docs) and then
        DttSP oscillator is set to an appropriate value to recover the signal of
        interest. This generally results in a DttSP oscillator value between -9.5
        and -12.5 khz.

        On the SoftRock all the tuning is done with the DttSP oscillator and it
        ranges over +/- 24 khz - giving a tuning range of 48 khz.

        Regards,

        Bill (kd5tfd)
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