wrote in message
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On Tue, 13 Nov 07, "BillP" wrote:
There is no combining of channels and your standard def TV can only
display 480 lines

Phantman:
Why do they always transmit their Hi Def programs on two channels?

On Wed, 14 Nov 07, "BillP" wrote:
Which PBS is your local?

Mississippi Public Broadcasting, WMAH Channel 19 in Biloxi


From what I see, WMAH transmits three channels-

19 Analog
19.1 Digital
19.2 Digital HD

You may be confusing "DT" with "HD" and seeing both channels as the same.