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Re: [softrock40] Does Ham Radio need a $15 two-band SDR receiver kit?

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  • KY1K
    ... Tony, isn t the response to the second harmonic only 6 db down???? Even if the second harmonic was 30 db down, signals that are s9 +30db are not at all
    Message 1 of 2 , Mar 1, 2006
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      At 02:07 PM 3/1/2006, you wrote:
      >Hi Art,
      >
      >Band switching is by changing the frequency of the QSD clocking by 2x. If
      >the QSD is well balanced then its response to the 2nd harmonic is well down
      >so one could listen to 80m signals and not be bothered by 40m signals at the
      >same time. This should make it possible to switch between two bands with a
      >wide BPF. On the other hand, what you say about having a narrow BPF for the
      >desired band makes good sense for a number of reasons.



      Tony, isn't the response to the second harmonic only 6 db down????

      Even if the second harmonic was 30 db down, signals that are s9 +30db
      are not at all uncommon, especially on 40 and 80 meters. That would
      leave the out of band signal at s9.

      Regards,

      Art
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