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
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