Hi Richard,
Ok! My apologies. I must have misunderstood what you wrote.
73, Edson PY2SDR
---
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On Fri, Jan 15, 2016 at 2:39 PM, Richard Bown <rich...@g8jvm.com> wrote:
> On Fri, 15 Jan 2016 14:23:48 -0200
> "Edson W. R. Pereira" <ewpere...@gmail.com> wrote:
>
> > On Fri, Jan 15, 2016 at 11:31 AM, Richard Bown <rich...@g8jvm.com>
> wrote:
> >
> > >
> > > You can feed a SDR with just an single audio feed and you will see the
> > > local ocillator and a
> > > positive spectrum on the right and a negative on the left, using a I&Q
> > > input allows you to remove
> > > the unwanted sideband , ie the negative image to the left. or vice
> versa
> > > if you select that.
> > >
> > >
> > Richard,
> >
> > I'm afraid this is incorrect. If you use only one of the channels and
> run a
> > real to real FFT on it you will see a mirrored spectrum. The negative
> > spectrum will be an exact mirror of the positive one. In order to see
> > negative and positive frequencies you will need both audio channels (I
> and
> > Q) and run a complex FFT.
> >
> > 73, Edson PY2SDR
>
> Thats what I said Edson :)
>
> --
> --
> Best wishes /73
> Richard Bown
>
> Email : rich...@g8jvm.com
> HTTP : http://www.g8jvm.com
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