Hi Kevin! It does have that option: When you set it to "Type: Float", a choice "Spectrum Width: Full" appears, which you can change to "Half".
Best, Marcus On 19.04.21 21:03, Kevin Reid wrote: > On Mon, Apr 19, 2021 at 11:44 AM Alberto <alberto_gnura...@libero.it > <mailto:alberto_gnura...@libero.it>> wrote: > > To obtain a real FFT i can use Float to Complex block ? > > > Float to Complex will do the same thing you're seeing now — it just writes a > zero > imaginary component into the stream. > > If you need a signal with an actually one-sided spectrum you can use the > Hilbert block, > which uses the Hilbert transform to generate a 90° phase shifted quadrature > component. But > that is just wasted compute cycles unless your next signal processing step > actually needs > that result. For viewing purposes, just ignore the other side of the > spectrum. (It would > be nice if the QT GUI Frequency Sink had an option to hide it when given > float input, but > as far as I know, it doesn't.)
