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51235Re: [softrock40] Softrock frequency for 10.680 MHz

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  • Alan
    Jan 4, 2011
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      ----- Original Message -----
      From: "G3RIR"
      Subject: [softrock40] Softrock frequency for 10.680 MHz


      >I have just completed a Softrock Lite II and used the band specific
      > components for 30m but I intend to use it on the IF of my TS2000. The IF
      > is
      > 10.695 MHz but an article I have found by K4DSP suggests setting the
      > Softrock at 10.680 MHz to avoid a "DC hump".
      >

      It should be no more than just a spike, but yes, this is the usual way of
      doing it.

      >But it would seem to me better to set the QRP2000 to
      > 42.72 MHz and this gives 10.68 from the divider and not relying on the
      > presence of harmonics.
      >

      This is the normal way with Si570 Softrocks.
      The "subharmonic" way is used when the requirement would be for crystals on
      unusually high fundamentals.

      73 Alan G4ZFQ
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