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ultra high frequency (UHF)
Cycles per second: 300 MHz to 3000 MHz

Wavelength: 1 m to 100 mm

Ultra high frequency (UHF) designates a range (band) of electromagnetic waves whose frequency is between 300 MHz and 3.0 GHz. Waves whose frequency is above the UHF band fall into the microwave or higher bands, while lower frequency signals fall into the VHF or lower bands. See electromagnetic spectrum for a full listing of frequency bands. A band is a small section of the spectrum of radio communication frequencies, in which channels are usually used or set aside for the same purpose. ... Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ... A wave is a disturbance that propagates through space, often transferring energy. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... The hertz (symbol: Hz) is the SI unit of frequency. ... Microwave image of 3C353 galaxy at 8. ... Very high frequency (VHF) is the radio frequency range from 30 MHz to 300 MHz. ... Legend: Î³ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultrahigh frequency VHF = Very high frequency HF = High frequency...

## Uses

UHF and VHF are the most common frequency bands for television. Modern mobile phones also transmit and receive within the UHF spectrum, and UHF is widely used for two-way radio communication (usually using narrowband frequency modulation, but digital services are on the rise) by both public service agencies and the general public. Though television broadcasting is common on UHF, there has traditionally been very little radio broadcasting in this band until fairly recently; see digital audio broadcasting for details. In communications, transmission is the act of transmitting electrical messages (and the associated phenonomena of radiant energy that pass through media). ... When used in supervisory signaling in telephony, the term frequency-change signaling has been used to describe frequency modulation. ... Digital Audio Broadcasting or DAB is a technology for broadcasting audio programming in digital form that was designed in the late 1980s. ...

One uncommon use of UHF waves is in the detection of partial discharges. These discharges occur due to the sharp geometries created in high voltage insulated equipment. The advantage is that this method can be used to localize the source of the discharge, but it is extremely sensitive to external noise. Nonetheless, such detection methods are used in the field especially for large distribution transformers. In electrical engineering, a partial discharge is a localised dielectric breakdown of a section of dielectrically stressed electrical insulation system that occurs generally in voids, cracks or interfaces within that insulation system. ... Look up Discharge in Wiktionary, the free dictionary. ... International danger high voltage symbol. ... Three-phase pole-mounted step-down transformer. ...

The main advantage of UHF transmission is that its high frequency means it has a physically short wave. Since the size of transmission and reception equipment (particularly antennas) is related to the size of the wave, smaller, less conspicuous antennas can be used than with VHF or lower bands. In biology, antenna (plural: antennae) refers to the sensing organs of several arthropods. ...

UHF is also widely used in two-way radio systems and cordless phones due to the fact that since UHF signals essentially travel over line-of-sight distances, distant transmissions cannot travel far enough to interfere with local transmissions. A great number of public safety and business communications are handled on UHF, and civilian applications such as GMRS, PMR446, and UHF CB are extremely popular. Where communications greater than line-of-sight are required, a repeater is used to propagate signals that otherwise would not reach their destinations. A portable phone or cordless phone is a wireless telephone which is associated with a fixed telephone landline (POTS) and can only be operated close to (typically less than 100 metres of) its base station, such as in and around the house. ... The General Mobile Radio Service (GMRS) is a land-mobile radio service in the United States available for short-distance two-way communications to facilitate the activities of an adult individual and his or her immediate family members, including a spouse, children, parents, grandparents, aunts, uncles, nephews, nieces, and in... Alan 456r PMR446 (Personal Mobile Radio, 446 MHz) is a radio frequency part of the UHF range that is open without licensing for personal usage in most members of the European Union. ... UHF CB is a licence-free citizens band radio service authorised by the government of Australia in the UHF 477MHz band. ... A repeater is an electronic device that receives a weak or low-level signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. ...

## History

### United States

On December 29, 1949 KC2XAK of Bridgeport, Connecticut became the first UHF television station to operate on a regular daily schedule. The first true commercially licensed UHF television station on the air was KPTV/Channel 27 (now VHF Channel 12) in Portland, Oregon on September 18, 1952. December 29 is the 363rd day of the year (364th in leap years) in the Gregorian Calendar, with 2 days remaining. ... 1949 (MCMXLIX) was a common year starting on Saturday (the link is to a full 1949 calendar). ... Nickname: The Park City Official website: www. ... KPTV is the FOX television affiliate serving the Portland, Oregon metropolitan area. ... Flag Seal Nickname: City of Roses, Stumptown, Bridgetown Location Location in Multnomah County and the state of Oregon Coordinates , Government Country State County United States Oregon Multnomah County Mayor Tom Potter Geographical characteristics Area     City 145. ... September 18 is the 261st day of the year (262nd in leap years). ... 1952 (MCMLII) was a Leap year starting on Tuesday (link will take you to calendar). ...

The Family Radio Service and General Mobile Radio Service use the 462 and 467 MHz areas of the UHF spectrum; there is also a great amount of unlicensed activity (cordless phones, wireless networking, and the like) clustered around 800 MHz and 2.4 GHz. The Family Radio Service is an improved walkie talkie system authorized in the United States. ... The General Mobile Radio Service (GMRS) is a land-mobile UHF radio service in the United States available for short-distance two-way communications to facilitate the activities of an adult individual who possesses a valid GMRS license, as well his or her immediate family members, including a spouse, children...

### United Kingdom

In Britain, UHF television began with the launch of BBC2 in 1964. BBC1 and ITV soon added their own services on UHF (British channels 21 to 69) on November 15, 1969, and PAL colour was introduced on UHF only in 1967 (for BBC2) & 1969 (for BBC1 & ITV). VHF only carried BBC1 & ITV and was only ever in 405 line Black & White. VHF television was closed in February 1985. Today all British terrestrial (non-satellite) television channels (analogue and digital) are on UHF. A drawback to this is the very large number of small relay transmitters needed to fill in gaps in the main transmitters' coverage, which would not have been necessary with a VHF system due to its different propagation characteristics. BBC Two (or BBC2 as it was formerly styled) was the second UK television station to be aired by the BBC and Europes first television channel to broadcast regularly in colour (from 1967), envisaged as a home for less mainstream and more ambitious programming. ... 1964 (MCMLXIV) was a leap year starting on Wednesday (the link is to a full 1964 calendar). ... BBC One (or BBC1 as it was formerly styled) is the oldest television station in the world. ... ITV (Independent Television) is the name given to the original network of British commercial television broadcasters, set up under the Independent Television Authority (ITA) to provide competition to the BBC. In England, Wales and southern Scotland, the channel has been rebranded to ITV1 by ITV plc, the owners of the... November 15 is the 319th day of the year (320th in leap years) in the Gregorian Calendar, with 46 days remaining. ... 1969 (MCMLXIX) was a common year starting on Wednesday (the link is to a full 1969 calendar). ... PAL, short for phase-alternating line, phase alternation by line or phase alternation line, is a colour encoding system used in broadcast television systems in large parts of the world. ... 1967 (MCMLXVII) was a common year starting on Sunday of the Gregorian calendar (the link is to a full 1967 calendar). ... 1969 (MCMLXIX) was a common year starting on Wednesday (the link is to a full 1969 calendar). ... 1985 (MCMLXXXV) was a common year starting on Tuesday of the Gregorian calendar. ... Analog television encodes television picture information as an analog signal, that is, by varying the voltages and/or frequencies of the signal. ... Digital television (DTV) uses digital modulation and compression to broadcast video, audio and data signals to television sets. ...

### Australia

Australia also provides the UHF CB service for general-purpose two-way communications. UHF CB is a licence-free citizens band radio service authorised by the government of Australia in the UHF 477MHz band. ...

### Malaysia

UHF broadcasting was used outside Kuala Lumpur and the Klang Valley by private TV station TV3 in the late 80s, with the government stations only transmitting in VLF and VHF and the 450MHz range being occupied by the ATUR cellular phone service operated by Telekom Malaysia. The ATUR service ceased operation in the late 90s, freeing up the frequency for other uses. UHF was not commonly used in the Klang Valley until 1994 (despite TV3's signal also being available over UHF Channel 29, as TV3 transmitted over VHF Channel 12 in the Klang Valley). 1994 saw the introduction of the channel MetroVision (which ceased transmission in 1999, got bought over by TV3's parent company - System Televisyen Malaysia Berhad - and relaunched as 8TV in 2004). This was followed by NTV7 in 1998 (also acquired by TV3's parent company in 2005) and recently Channel 9 (which started in 2003, ceased transmission in 2005, was also acquired by TV3's parent company shortly after, and came back as TV9 in early 2006). At current count, there are 4 distinct UHF signals receivable by an analog TV set in the Klang Valley: Channel 25 (8TV), Channel 29 (TV3 UHF transmission), Channel 37 (NTV7) and Channel 39 (TV9). Channel 35 is usually allocated for VCRs, decoder units (i.e. the ASTRO and MiTV set top boxes) and other devices that have an RF signal generator (i.e. game consoles). Flag Seal Nickname: KL Motto: Maju dan makmur (Malay: Peace and progress) Location Location in Malaysia Coordinates: Government Country State Malaysia Federal Territory Establishment 1857 (Granted city status in 1974) Mayor Ruslin Hasan Geographical characteristics Area 243. ... Klang Valley is the area in central Selangor, Malaysia comprising Kuala Lumpur and its surroundings and suburbs naturally delineated by hilly areas and the Port Klang coastline. ... http://en. ... Telekom Malaysia Berhad (TM) is the largest telecommunication company in Malaysia. ... 8TV (Simplified Chinese: å…«åº¦ç©ºé—´; Pinyin: BÄ DÃ¹ KÅng JiÄn) is a private Malaysian television station previously known as Metrovision. ... It has been suggested that this article or section be merged with Channel 9 (Malaysia). ... The term set-top box (STB) describes a device that connects to a television and some external source of signal, and turns the signal into content then displayed on the screen. ...

## Frequency Allocation - United States

A brief summary of some UHF frequency usage:

• 300–420 MHz: government use, including meteorology
• 420–450 MHz: radiolocation and Amateur radio (ham - 70 cm band)
• 470–512 MHz: TV channels 14–20, public safety
• 512–698 MHz: TV channels 21–51 (channel 34 used for radar[citation needed], channel 37 used for radio astronomy)
• 698–806 MHz: TV channels 52–69 (to be auctioned for other uses once conversion to digital TV has been accomplished)
• 806–824 MHz: pocket pagers and Nextel SMR band (formerly TV channels 70–72)
• 824–849 MHz: Cellular phones, A & B franchises, mobile phone (formerly TV channels 73–77)
• 849–869 MHz: public safety 2-way (fire, police, ambulance - formerly TV channels 77–80)
• 869–894 MHz: cellular phones, A & B franchises, base station (formerly TV channels 80–83)
• 902–928 MHz: ISM band: cordless phones and stereo, Radio Frequency Identification, datalinks, Amateur radio (33 cm band)
• 928–960 MHz: mixed Studio-Transmitter Links, mobile 2-way, other
• 1240–1300 MHz: Amateur radio (ham - 23 cm band)
• 1850–1910 MHz: PCS mobile phone—note below
• 1930–1990 MHz: PCS base stations—note below
• note: order is A, D, B, E, F, C blocks. A, B, C = 15 MHz; D, E, F = 5 MHz
• 2310–2360 MHz: Satellite radio (Sirius and XM)
• 2390–2450 MHz: Amateur radio (ham - 13 cm band)
• 2400–2483.5 MHz: ISM, IEEE 802.11, 802.11b, 802.11g Wireless LAN, IEEE 802.15.4
• around 2450 MHz: Microwave oven

## Frequency Allocation - United Kingdom

• 430–440 MHz: Amateur radio (ham - 70 cm band)
• 470–862 MHz: TV channels 21–69 (channel 36 used for radar, channel 38 used for radio astronomy, channel 69 used for licenced and licence exempt wireless microphones, channels 31-40 and 63-68 to be auctioned for other uses)
• 1240–1316 MHz: Amateur radio (ham - 23 cm band)
• 2310–2450 MHz: Amateur radio (ham - 13 cm band)

70 Centimeters is a common ham radio band in the UHF spectrum. ...

## Australia

UHF Citizens Band: 476.425 - 477.400 MHz Refer: http://www.manilla2007.com/Default.aspx?tabid=145

 Radio spectrum ELF SLF ULF VLF LF MF HF VHF UHF SHF EHF 3 Hz 30 Hz 300 Hz 3 kHz 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz 3 GHz 30 GHz 30 Hz 300 Hz 3 kHz 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz 3 GHz 30 GHz 300 GHz

Visible (optical) spectrum: The Electromagnetic Spectrum (Sorted by wavelength, short to long) Gamma ray | X-ray | Ultraviolet | Visible spectrum | Infrared | Terahertz radiation | Microwave | Radio waves Violet | Blue | Green | Yellow | Orange | Red W band | V band | K band: Ka band, Ku band | X band | C band | S band | L band EHF | SHF | UHF | VHF | HF | MF | LF | VLF | ULF | SLF | ELF Microwave | Shortwave | Mediumwave | Longwave

## External articles

• Tomislav Stimac, "Definition of frequency bands (VLF, ELF... etc.)". IK1QFK Home Page (vlf.it).

Results from FactBites:

 UHF (829 words) The Portland release party is scheduled for October 28th at the Wonder Ballroom. Also a UHF poster is seen in the background. On Saturday, Sept. 14th, UHF were broadcast live on KEXP (90.3 FM Seattle).
 Ultra high frequency - Wikipedia, the free encyclopedia (1472 words) One uncommon use of UHF waves is in the detection of partial discharges. UHF is also widely used in two-way radio systems and cordless phones due to the fact that since UHF signals essentially travel over line-of-sight distances, distant transmissions cannot travel far enough to interfere with local transmissions. UHF broadcasting was used outside Kuala Lumpur and the Klang Valley by private TV station TV3 in the late 80s, with the government stations only transmitting in VLF and VHF and the 450MHz range being occupied by the ATUR cellular phone service operated by Telekom Malaysia.
More results at FactBites »

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