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 nil carborundum a illegitemis ################################################################################## Ham Call: G8JVM . QRV: 50-432 MHz + Microwave 23 cms 140W, 13 cms 100W & 3cms 5W Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W QRV VHF 6mtrs 200W, 4 mtrs 150W, 2mtrs 400W, 70cms 200W OS: Linux Mint 17.3 x86_64 on a Dell Inspiron N5030 laptop ################################################################################## ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
