"2-1" is what you would use on a HDTV to tune the hi-def version of over-the-air channel 2. Sometimes a dot (".") is used instead. APparently this is a temporary separation of the SD and HD versions of the Food Channel until they get around to simulcasting. I note they gave MHD it's own number.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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"2-1" is what you would use on a HDTV to tune the hi-def version of over-the-air channel 2. Sometimes a dot (".") is used instead. APparently this is a temporary separation of the SD and HD versions of the Food Channel until they get around to simulcasting. I note they gave MHD it's own number.