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I read (and it may be inaccurate), that DTV signals are really either on or off - reception or black screen
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It would be more accurate to describe it as "either they're perfect (enough) or they aren't". When they aren't, the reception defect will manifest in any number of manners, depending on the tuner's capability and design, and on the relative degree of signal impairment. Typical manifestations of an impaired signal include pixelization, macro-blocking, audio dropouts, frozen images, black/blue screen, "Weak/No Signal" messages, etc.