Published On Jul 21, 2023
Yes, really. In this video, we'll look at how you can use Audacity to generate actual radiofrequency signals. We'll look at mono AM and FM, as well as stereo FM (the Zenith/GE system we all use nowadays), and we'll also look at the infamous C-QUAM AM stereo system that's sometimes seen on the air but rarely heard. Audacity's maximum audio bandwidth is somewhat limited, but, 384khz is enough (although a 192k broadcast FM signal maxes it out).
We'll use SDRuno and SodiraSDR to demodulate the signals. I apologize for messing up with the AM stereo demo :(
Also, if you have a GOOD soundcard that can output a signal with 192 KHz of audio bandwidth at a 384 KHz sample rate, you can run that into a double-balanced modulator (with the carrier being generated by a signal generator or an RF oscillator of some kind) and then out the air. Of course, this isn't a real-time solution at all; if you need a real-time solution, check out GNUradio.