Score023 said:
What are sub channels? Also for someone in the Chicago area, what sub channels are available to us?
ATSC Digital broadcasts, provide the broadcaster the ability to basically broadcast more then one channel at a time.
In Chicago:
During NCAA Tourney time (At least the past years), 2-2 was activated to show an extra game... or the Analog Channel 2 would show one game, where the 2-1 (HD) would show another.
5-2 ; Is NBC Weather Plus (Basically the weather channel, but specifically for chicago)
7-2 ; Is a weather/traffic channel
7-3 ; Is additional local programming
9-2 ; IIRC is an entirely different station, that they are broadcastiong there.
11-2; 11-3; are additional PBS Feeds from WTTW
And so on...... Those are the one's I know without looking