Band V

Lore & Background

Band V occupies the ultra high frequency range, with varying definitions across sources. The Broadcast engineer's reference book and the BBC place it at 614 to 854 MHz, while the IPTV India Forum gives 582 to 806 MHz, and the DVB Worldwide website cites 585 to 806 MHz. It has been employed for analogue and digital television (DVB-T and ATSC), radio microphones, and mobile services like DVB-H.

In Australia, UHF channel allocations are 7 MHz wide, with Band V covering channels 36 to 69 (base frequencies 585.5 to 816.5 MHz). New Zealand uses 8 MHz channels, with digital channels 36 to 49 (base 594.0 to 698.0 MHz). The United Kingdom traditionally allocated 30 channels from UHF 39 to 68, plus channel 69, each 8 MHz wide. Semi-wideband aerials of group E cover the entire band, while groups B and C/D cover lower and upper halves with higher gain.

With the close-down of analog television, most countries auctioned frequencies from 694 MHz and up to 4G cellular network providers. In the UK, channels 61–68 were cleared for 4G mobile broadband after an Ofcom auction in January 2013 and spectrum award on 1 March 2013. Channels 49–60 are due for clearance from 2022 for mobile data, per an Ofcom decision of 19 November 2014. In the United States, 698–806 MHz (formerly UHF TV channels 52–69) was auctioned in March 2008, with full use after the digital TV transition on 12 June 2009; T-Mobile USA began using its 'block A' allotment in 2015. The 614–698 MHz range (TV channels 38–51) was scheduled for auction in March 2016.

Reader's Guide

Band V's significance lies in its central role in the transition from analogue to digital television and the subsequent reallocation of spectrum for mobile broadband. As analog services shut down, governments worldwide repurposed upper portions of the band for 4G cellular networks, generating substantial revenue through spectrum auctions. In the UK, the clearance of channels 61–68 for 4G services in 2013, followed by the planned reallocation of channels 49–60 from 2022, illustrates the ongoing shift from broadcast to mobile data use. The United States similarly auctioned the 698–806 MHz segment in 2008, with full deployment after the digital television transition in 2009, and later auctioned the 614–698 MHz range in 2016. These actions reflect the high value of UHF spectrum for mobile communications due to its favorable propagation characteristics. The legacy of Band V is thus twofold: it served as the backbone for terrestrial television broadcasting for decades, and it now forms a critical part of the infrastructure for modern mobile networks. The disputed frequency ranges among sources highlight the lack of a single global standard, but the band's practical importance remains consistent across regions.

Did You Know?

• Sources disagree on Band V's exact frequency range, with definitions including 614–854 MHz, 582–806 MHz, and 585–806 MHz.
• The United States auctioned the 698–806 MHz portion of Band V in March 2008, with full use after the digital TV transition on 12 June 2009.
• New Zealand's Band V digital channels are 8 MHz wide, covering channels 36 to 49 with base frequencies from 594.0 to 698.0 MHz.

Global Governance of a Finite Resource

The radio spectrum — spanning from 3 hertz up to 3,000 gigahertz — is not an open commons. Because electromagnetic waves in this range constitute a fixed, finite resource, their generation and transmission are tightly governed. National legislation sets the rules within each country's borders, while the International Telecommunication Union (ITU) coordinates those rules internationally to prevent cross-border interference. The ITU's Radio Regulations define roughly forty distinct radiocommunication services, and portions of the spectrum are either sold or licensed to private operators such as cellular carriers and broadcast television stations. In everyday parlance, frequency ranges are often named after their assigned purpose, like cellular spectrum or television spectrum. The ITU further carves the spectrum into twelve bands, each anchored to a wavelength that is a power of ten in metres. For every band, a detailed frequency plan prescribes channel numbering, carrier spacing, bandwidth, spectral masks, permissible modulation types, allowed content, and the licensing procedure. Local regulators, such as the U.S. Federal Communications Commission, enforce these plans domestically, while voluntary best practices help keep interference in check.

Where Does Radio End?

The exact edges of the radio spectrum are, by the conventions of physics, somewhat arbitrary rather than hard natural law. At the low end there is no true floor: radio waves are simply the lowest-frequency members of the electromagnetic family, and the ITU's own definition allows frequencies to extend arbitrarily lower than 3,000 GHz. At the high end the boundary meets the infrared region, but even that dividing line is fuzzy. The terahertz band, stretching from 300 gigahertz to 3 terahertz, sits in a grey zone. The ITU classifies it as the highest radio band, yet spectroscopic scientists treat those same frequencies as part of the far-infrared and mid-infrared. Because the spectrum is a fixed, finite resource, there is no way to simply add more bandwidth beyond what already exists. This immovability is what makes the allocation decisions so consequential: every hertz must be assigned deliberately, and the conventions that draw the boundaries carry real economic and technical weight.

Talking to Submarines: The Lowest Frequencies

At the bottom of the usable radio spectrum, physics imposes severe constraints. Antenna size grows in direct proportion to wavelength, so as frequency drops, the hardware needed to radiate power efficiently becomes enormous. Below roughly 10 kilohertz, where wavelengths stretch to about 30 kilometres, systems require elevated wire antennas many kilometres long, which is why very few radio applications operate that low. Below about 30 kilohertz, audio modulation becomes impractical and only very slow data communication is feasible. The absolute floor of practical radio communication sits near 80 hertz, in the extremely low frequency band. A handful of national navies have built ELF submarine-communication systems capable of reaching vessels submerged hundreds of metres beneath the ocean surface. These installations use ground dipole antennas 20 to 60 kilometres in length, driven by megawatts of transmitter power. The trade-off is staggering: data is transmitted at roughly one bit per minute, about 17 millibits per second, meaning a single character takes approximately five minutes to arrive.

The Atmospheric Ceiling

At the top of the radio spectrum, the atmosphere itself becomes the limiting factor. Above 30 gigahertz, the start of the millimeter-wave band, gases in the air begin absorbing radio energy with increasing severity. The result is that signal power decays exponentially with distance from the transmitting antenna. At 30 GHz, useful communication is already constrained to roughly one kilometre, and as frequency climbs further the viable range shrinks still more. In the terahertz band above 300 GHz, the situation becomes extreme: electromagnetic radiation is attenuated to essentially zero within just a few metres. Ozone, water vapour, and carbon dioxide are the principal absorbers, rendering the atmosphere nearly opaque to these waves. It is only when frequencies rise into the near-infrared and optical window that the air becomes transparent again. This is not a problem that better engineering can solve; it is a fundamental physical limitation. Unlike the low-frequency end, where the constraint is antenna size, the high-frequency ceiling is written into the composition of the air itself, and no amount of transmitter power can push a useful signal through it.

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