In an era of dazzling battery-powered portable devices including iPods, computers and cell phones, it’s hard to imagine what it’s like to be unable to catch the news and entertainment anytime and anywhere we want. But millions of people who own portable televisions, including those who depend on them when they flee their homes or lose power during hurricanes and other emergencies, may soon return to the dark ages. Virtually all of the nation’s 7 million battery-powered TVs receive analog signals.

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