Hi Tom I never thought it was simple :)
I am just trying to understand what is going on, so given by what you've said I would push the IQ data coming from the KX3 into an FFT, that FFT would then produce the circular buffer that would let me analyse what signals are in that band? But this would be in the frequency domain then, however I am not interested in a band plot, I have a signal at Freq X, with the KX3 tuned at Y, (X=Y), would I have to still pump that IQ data into the FFT to filter all the other signals out, then inverse teh FFT to get the IQ data that I would want? Regards On Thu, Jul 28, 2016 at 9:41 AM, tomb18 <tom...@videotron.ca> wrote: > Hi It's not that simple > Basically you take the I and q signals, sample them with the sound card, > convert them to a complex number, pop them in a fast Fourier transform, do > a rectangular to polar conversion and then calculate the magnitude in dBm. > Then plot them. There's a few more nuances but that's the overall idea. > Check out the free book on the Internet called the scientists guide to > digital signal processing. > 73 Tom > va2fsq.com > > > > Sent from my Samsung Galaxy smartphone. > > -------- Original message -------- > From: Enzo Adrian-Reyes <enzo.adrianre...@gmail.com> > Date: 2016-07-27 7:16 PM (GMT-05:00) > To: Elecraft List <elecraft@mailman.qth.net> > Subject: [Elecraft] KX3 SDR > > Hi All > > Yes this topic might be a little bit more complicated than the title > suggest. > > So I have the KX3 plugged into the audio input of my computer, and its > sending quadrature data (IQ) to the sound card, the sound card samples at > 96Khz. > > So my question is how I process this? Yes I know use a piece of software, > but I am trying to write this, I know the IQ data is coming through down > and if I use the right process on the IQ data I get base band data out. I > kind of know that however I dont understand the SDR data coming out, so for > example and I getting sample of IQ data at freq point Y, or is it a > circular buffer arrangement. > > I guess what I am saying is, is the IQ data coming from teh KX3 data from > teh Centre Freq (+/-) the bandwith scope, or just the centre freq + some > additional side bands? > > How are bandwith and sampling rate related? I mean if I am sampling at at > 96Khz, with a band with of 48Khz does that mean I am only getting 2 samples > per second at perticular freq??? Or am I getting the entire band of 48Khz > at 96Khz. > > Regards > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to tom...@videotron.ca > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
