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Broadcasters Disagree over Increase in Digital FM Power
IBOC signals as currently regulated can't cover same area digitally as their analog counterparts: Despite what the industry has told me for years, a not-very-secret bit of information has come to the fore. The FCC limits IBOC (digital AM/FM as approved in the U.S.) to 1/100th the signal strength of analog. If you have a 100,000-watt analog transmitter, you can broadcast 1,000 watts of digital signal. I have been repeatedly over three years that this provides nearly the same footprint for digital coverage as for analog.
Not so.
The NAB (National Association of Broadcasters) is split over a proposal to ask the FCC for a 10fold increase in digital power. Some stations are concerned that portable devices with HD Radio built in, when they finally start to appear, will be unable to receive strong enough signals.
Critics of the notion, which is still being tested by major networks and NPR, are concerned that the power boost would simply cause interference with adjacent or distant stations' analog signals. Many stations may lack the setup necessarily to power the higher signal, too.