547Re: decoding BC station with SDR - changing the LO or filter
- Feb 6, 2012dear all
many thanks for the reply.
jurgen, i will try it to use the command interpreter.
73 de hans
--- 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:.
> 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
> > 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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