VHF operates in two bands, low-VHF (channels 2-6) and high-VHF (channels 7-13), while UHF covers the higher channels, ranging from 14 to 36. Completed in 2009 in countries like the United States, the digital transition allowed broadcasters to use spectrum more efficiently through compression.
Analog Vs Digital Frequency Use: How Spectrum Efficiency Impacts Broadcast TV Frequencies
The actual radio frequency, or RF channel, is designated by a number like 36 or 42. UHF frequencies, operating at wavelengths around half those of VHF, allow for smaller, more efficient antennas and are less likely to suffer from certain types of interference.
This decoupling means that an antenna must be tuned to the specific RF frequency, even though the viewer thinks they are watching channel 4. However, these lower frequencies are prone to atmospheric noise and electrical interference, which can manifest as static or ghosting.
Analog Vs Digital Frequency Use: VHF, UHF, And Spectrum Efficiency
This move optimized the use of the public airwaves, balancing the needs of television viewers with the growing demand for mobile data. Importantly, the transition also involved a significant reallocation of spectrum, known as the broadcast incentive auction.
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