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Well, I don't think this is completely correct. First, I believe some stations provide a fiber feed to the cable systems in their area. This is now they get them with no interference like I and others are dealing with using antennas. I remember in the old days (before digital) the cable system would lose channels in bad weather. That does not happen any more around here.
Second, if you look at a given channels specs... Take WTIC (Fox) in Hartford. They have 61.1 for their HD and 61.2, an SD called Antenna TV. Mainly old TV shows with tons of ads.
I see no mention of an SD signal. But on Cox their SD is QAM channel 2162. It is a 4 x 3 format signal identical to their 16 x 9 HD on QAM channel 2611.
I have a feeling it is Cox (for my area) that is creating the SD from the HD.
Can anyone say for sure?
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