So, what's the deal with the so-called "extended hybrid mode" I've heard about before… just fiction?
There is only so much real estate to put your digital carrier inside of and 196kbps to do it with, so extending is not an option.
Some stations run asymmetrical HD because of an adjacent station on one side of their carrier. All that is involves is shifting higher digital carrier power to one side of the channel and lowering the one closest to the adjacent station.
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