As part of its plan to shift 120 MHz of spectrum from TV broadcasting to wireless broadband, the Federal Communications Commission wants to pack TV stations more tightly together in the remaining 180 MHz of spectrum to free up some for auction. To do that most efficiently, it must make the VHF portion of that remaining spectrum (channels. 2-13) more hospitable to broadcasting.
The FCC has proposed increasing the power of VHF stations and imposing minimum performance standards on VHF receive antennas. It also called for other ideas for making VHF work better. The initiative is badly needed. After the final transition from analog to digital in June 2009, the VHF band, particularly the lower end (chs. 2-6), was exposed as a digital weakling. But improving the VHF service will not be easy. In the rulemaking, the FCC floats two ideas for reinvigorating VHF broadcasting.
First, it proposes to raise the maximum transmitted power (effective radiated power or ERP) of VHF stations in its heavily populated Zone 1 (the Northeast and Upper Midwest). Stations in the low-V band could up their power to 40 kW, while those operating in the high-V band could go to 120 kW. If the broadcast antennas are higher than 305 meters above average terrain, the power limits would be somewhat lower. The greater power “would help to compensate for some of the higher noise levels that tend to be present where consumers use indoor antennas,” the rulemaking says.
Second, the FCC proposes a standard for receive antenna performance, namely the ANSI/CEA-2032-A standard. It demands that antennas produce gain of at least -12 dBd on low-V channels and -8 dBd on high-V channels. The FCC also suggests that VHF stations looking to improve service add a vertically polarized element to their broadcast antenna if they don't already have one.