SDR (Software Defined Radio)art 1
I see you...
If you broadcast RF energy, no matter the modulation protocol, It ends up in the RF spectrum. No new news here. You can rig a spectrum analyzer and see the carrier frequency and note where it is and see the sidebands and everything else but the analog equipment to do this is super expensive. Now we have SDR, all the difficult stuff is done in software. The expensive hardware dissolves into algorithms and fancy math equations. Of course, you still need and antenna, RF filter, and maybe a bit of amplification as a frontend before you hit a ADC (analog to digital converter). Next, we send the computer a digital serial stream to an appropriate driver that provides the data for the whole freakin' RF band the frontend filter let in, and an appropriate app suitable for your operating system and you can display all this data in its glory. You can break into the business for about $20 and there is a lot of open-source software apps for SDR that is free.