Radio repeaters are used to retransmit UHF signals when a distance greater than the line of sight is required. In 2009, as part of the transition from analog to digital over-the-air broadcast of television, the spectrum from 698 MHz to 806 MHz (UHF channels 52–69) was removed from TV broadcasting, making it available for other uses. UHF wavelengths are short enough that efficient transmitting antennas are small enough to mount on handheld and mobile devices, so these frequencies are used for two-way land mobile radio systems, such as walkie-talkies, two way radios in vehicles, and for portable wireless devices; cordless phones and cell phones. Ultra High Frequency (UHF) radio stations are currently used for Air Traffic Control air-ground voice communications for military aircraft flying as operational air traffic (OAT) and for the handling of non-8.33 kHz State aircraft which may operate as General Air Traffic/Instrument Flight Rules (GAT/IFR) in 8.33 kHz airspace. Since the size of a reception antenna is directly proportional to the size of the waves, the antennas for UHF are short and stout. Ultrahigh frequency definition, any frequency between 300 and 3000 megahertz. Since 1962, UHF channel tuners (at the time, channels 14-83) have been required in television receivers by the All-Channel Receiver Act. The higher the frequency band is, the less conspicuous the antenna size would be. The spectrum from 806 MHz to 890 MHz (UHF channels 70–83) was taken away from TV broadcast services in 1983, primarily for analog mobile telephony. ULTRA HIGH FREQUENCY (U.H.F) TRANSMISSION LINES (TRANSMISSION LINES AS CIRCUIT ELEMENTS) Ultra High Frequency lines commonly abbreviated as U.H.F lines are one of the types of the transmission lines. Ultra-High Frequency Ultra-high frequency capacitors are made of Mica and not Polypropylene. To date no ultrasonography morphological studies of labial salivary glands (LSG) have been carried out in SS. The size of transmission and reception antennas is related to the size of the radio wave. Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter). 863–865 MHz: Used for licence-exempt wireless systems. They can operate at temperatures up to 150 degrees C, and at frequencies up to 100MHz. At the top end of the band slot antennas and parabolic dishes become practical. The wavelengths corresponding to these limit frequencies are 1 meter and 10 centimeters. Vinyl and CD Discography; 4 Releases 4 Singles & EPs 28 Appearances 1 Singles & … Until I looked up the limits of human hearing. 1432–1435 MHz: Proposed wireless medical telemetry service. Ultra High Frequency Tags at a glance. For satellite communication, helical, and turnstile antennas are used since satellites typically employ circular polarization which is not sensitive to the relative orientation of the transmitting and receiving antennas. 870–960 MHz: Cellular communications (GSM900 - Vodafone and O2 only) including GSM-R and future TETRA, 1710–1880 MHz: 2G Cellular communications (GSM1800), 1900–1980 MHz: 3G cellular communications - mobile phone uplink, 2110–2170 MHz: 3G cellular communications - base station downlink, 470–512 MHz: Low-band TV channels 14–20 (shared with public safety, 512–608 MHz: Medium-band TV channels 21–36, 614–698 MHz: Mobile broadband shared with TV channels 38–51, 617–652 MHz: Mobile broadband service downlink, 652–663 MHz: Wireless microphones (higher priority) and unlicensed devices (lower priority), 663–698 MHz: Mobile broadband service uplink, 806–816 MHz: Public safety and commercial 2-way (formerly TV channels 70–72), 817–824 MHz: ESMR band for wideband mobile services (mobile phone) (formerly public safety and commercial 2-way), 824–849 MHz: Cellular A & B franchises, terminal (mobile phone) (formerly TV channels 73–77), 849–851 MHz: Commercial aviation air-ground systems (, 851–861 MHz: Public safety and commercial 2-way (formerly TV channels 77–80), 862–869 MHz: ESMR band for wideband mobile services (base station) (formerly public safety and commercial 2-way), 869–894 MHz: Cellular A & B franchises, base station (formerly TV channels 80–83), 894–896 MHz: Commercial aviation air-ground systems (, 901–902 MHz: Narrowband PCS: commercial narrowband mobile services, 930–931 MHz: Narrowband PCS: commercial narrowband mobile services, 932–935 MHz: Fixed microwave services: distribution of video, audio and other data, 940–941 MHz: Narrowband PCS: commercial narrowband mobile services. 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