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547Re: decoding BC station with SDR - changing the LO or filter

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  • hm2612
    Feb 6, 2012
    • 0 Attachment
      dear all

      many thanks for the reply.
      jurgen, i will try it to use the command interpreter.

      73 de hans
      oe1smc

      --



      --- In SpectrumLabUsers@yahoogroups.com, wolf_dl4yhf <dl4yhf@...> wrote:
      >
      >
      > Am 02.02.2012 12:50, schrieb Graham Mcleod:
      > > Hans,
      > > Certain kinds of FFT (& Hardware) can output a -ve & +ve
      > > Frequency spectrum, with Zero at the centre.
      > > If downmixed, this translates as LO frequency +/- Separated.
      > > Upper and Lower Sidebands, with Image Rejection.
      > > As a new user, I haven't yet discovered if SL can do this,
      > > or how to configure it for this.
      >
      > That's exactly what the FFT's 'complex input' option for the is for:.
      >
      > http://www.qsl.net/dl4yhf/speclab/settings.htm#fft_settings
      >
      > It comes in two flavours: with separate input channels (for external
      > quadrature mixers), and with internal frequency shift (for
      > single-channel input, in this case the quadrature mixing is done by
      > software).
      >
      >
      >
      >
      > > However this ought to yield
      > > reception through "Zero Frequency", with DC coupled ADC's....
      > > Or a 40Hz central notch, with 20Hz HPF Audio Soundcards?. Gra.
      > >
      >
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