Last updated: September 21, 2009 - 7:27am
Think the digital TV transition is over? Not quite. Many viewers have found that they can't pick up certain stations after the switch, even with the right TVs or converter boxes. The stations are still trying to figure out ways to help them tune in. The main problem is that when the last major stations turned off their analog TV on June 12 to broadcast entirely in digital, some of them moved their digital signals from the UHF frequency band (channels 14 to 69) to VHF (channels 2 to 13). To most viewers, these channels are just different numbers on the remote. But as signals in the airwaves, they have very different characteristics. VHF hadn't been used much for digital signals, and there were indications that there would be problems with the switch, partly because viewers had inadequate indoor antennas. Still, the switch went ahead. Since then, at least 20 VHF stations have asked the Federal Communications Commission to move their digital signals back to UHF, and more would like to do so. However, the government has sold off some of the UHF band to cell phone carriers, leaving less space for TV channels. Another portion is planned to be used for emergency services, which was another reason for the digital TV transition.