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Re: [softrock40] RXTX_04 Dividers

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  • Tom Planer
    Mike Checked the book, no help there. Did the math, yep, third harmonic. Thanks again. Tom ... From: Mike Collins To: softrock40@yahoogroups.com Sent: Monday,
    Message 1 of 4 , Jan 31, 2011
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      Checked the book, no help there.  Did the math, yep, third harmonic.
      Thanks again.
      ----- Original Message -----
      Sent: Monday, January 31, 2011 1:22 PM
      Subject: Re: [softrock40] RXTX_04 Dividers


      Tune Tab: Set, 7.04 mhz
      Test Values:  QSE Clk 0= 21.123
                    QSE Clk 1= 21.123
                    QSD Clk 0= 21.123
                    QSD Clk 1= 21.123
      Does anyone have any explanation why my frequencies arn't nominal 7.04 like the auther's??

      Hi Tom,

      Are you using a freq counter?  If so, they respond to harmonics.  The QSD clocks are square wave which have 1st, 3rd, 5th, 7th,... harmonics.

      Some freq counters have a LowPass button to help prevent this (sometimes depending on the rolloff).

      73,  Mike Collins   KF4BQ

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