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Digital TV is a marriage of television and computer technology. When you first set up your digital TV or your digital converter box, you must go into the menu and find the channel selection function - manufacturers have different names for this, but is usually something like "auto channel select," "auto channel scan" or "auto channel memory." When you run this feature your TV tuner searches the sky for all of the signals it can understand and locks those channels into its memory. When completed, you can scroll through and watch any of the channels saved. Because these channels are precisely controlled by a computer chip, any disruption will affect the memory and you must re-scan the channels. For example, if you or the weather move your antenna significantly, you must re-scan. If you lose your electricity and the TV loses memory, you must re-scan. When in doubt, re-scan. But the computer chip's preciseness does not allow it to save poorly received signals. You either have perfect picture and sound, or none at all. This is called the "cliff-effect" of digital TV. If the signal is too weak, it "falls" out of memory. |