Hi Yes, well I have used those in the past, hence my confusion, when I see bandwith of a SDR at lets say 24Khz and I am sampling at 48Khz. Does that mean I am sampling the whole bandwith of 24Khz centered on freq X, or am I a sampling some point Y at +/- from the center frequency.
I am trying to design a digital mode, and while I do understand the concepts, could do it in GNU radio but it abstracts a lot of this away, and I would like to do this in C/C++ So before getting there I have to know what is going on, especially what data is coming from the device. Thinking about it yeah it would have to be a stream of IQ signals coming from the KX3 with a certain freq set, but I am guessing its in the time domain. Not at the freq domain? On Thu, Jul 28, 2016 at 10:26 AM, Don Wilhelm <[email protected]> wrote: > If you are writing your own software, you will have to become proficient > in Digital Signal Processing. The I and Q signals are simply baseband > signals that are 90 degrees out of phase - by themselves, they will do > nothing but audio signals, but with DSP processing, they can do most > anything that is possible in the math of digital signals - limited only by > your processing power and skills at DSP signal processing. > > Run them through FFT transforms to convert them to digital signals, and > then do the math of your DSP algorithms to produce whatever you want - > panadapter display, demodulation, etc. You can add filtering and other > things like AGC, Noise Reduction, Noise Blanking, and a whole variety of > effects. It is all in how you choose to implement you DSP mathematical > functions. > > Rather than write your own, there are several DSP applications available > for free or at nominal cost - try HDSDR or NaP3 or WIN4K3 as examples. > Once you see what is happening with those applications, you may be moved > to write your own DSP application to process the I and Q signals. > > 73, > Don W3FPR > > > On 7/27/2016 7:16 PM, Enzo Adrian-Reyes wrote: > >> 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. >> >> >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
