SiriusXM is a company that does a lot more than just "making radio channels." This is an egregious security issue, but SXM offering the service makes sense. They also offer an aviation weather service.
When you look at the physical layer it's just a 1.5 mbit data stream carrying whatever you want, pointed at most of North America. Over time some of that bandwidth was carved out for data services at the expense of audio quality.
When you look at the physical layer it's just a 1.5 mbit data stream carrying whatever you want, pointed at most of North America. Over time some of that bandwidth was carved out for data services at the expense of audio quality.