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HD2 and HD3 are nothing but extra channels that are broadcasted on one frequency.
Multicasting allows you to broadcast multiple channels on one frequency. For example, if your radio station’s frequency is 97.1, the main analog channel is also broadcast in digital technology on 97.1-HD1. The next option moving up the dial is 97.1-HD2. The next is 97.1-HD3. These are all different channels. With Multicasting through HD Radio technology, listeners can be offered a variety of options. Moreover, you can offer your advertisers more options for reaching various audiences. HD2 and HD3 channels bring a new revenue stream for radio stations. Some broadcasters use additional channels to extend their current brand and format. Others use the extra channels to dive into uncharted territory by creating unique and compelling content that has never been heard before on the radio. I learnt a great deal about HD2/ HD3 channels on a website. I recommend the same to you if you want to learn everything there is to know about these channels.