Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF).
In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. The intermediate frequency is created by mixing the carrier signal with a local oscillator signal in a process called heterodyning, resulting in a signal at the difference or beat frequency. Intermediate frequencies are used in superheterodyne radio receivers, in which an incoming signal is shifted to an IF for amplification before final detection is done.
A subcarrier is a sideband of a radio frequency carrier wave, which is modulated to send additional information. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast. There is no physical difference between a carrier and a subcarrier; the "sub" implies that it has been derived from a carrier, which has been amplitude modulated by a steady signal and has a constant frequency relation to it.
The FM broadcast band is a range of radio frequencies used for FM broadcasting by radio stations. The range of frequencies used differs between different parts of the world. In Europe and Africa and in Australia and New Zealand, it spans from 87.5 to 108 megahertz (MHz) - also known as VHF Band II - while in the Americas it ranges from 88 to 108 MHz. The FM broadcast band in Japan uses 76 to 95 MHz, and in Brazil, 76 to 108 MHz. The International Radio and Television Organisation (OIRT) band in Eastern Europe is from 65.9 to 74.0 MHz, although these countries now primarily use the 87.5 to 108 MHz band, as in the case of Russia. Some other countries have already discontinued the OIRT band and have changed to the 87.5 to 108 MHz band.
Digital radio is the use of digital technology to transmit or receive across the radio spectrum. Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services.
Amateur television (ATV) is the transmission of broadcast quality video and audio over the wide range of frequencies of radio waves allocated for radio amateur (Ham) use. ATV is used for non-commercial experimentation, pleasure, and public service events. Ham TV stations were on the air in many cities before commercial television stations came on the air. Various transmission standards are used, these include the broadcast transmission standards of NTSC in North America and Japan, and PAL or SECAM elsewhere, utilizing the full refresh rates of those standards. ATV includes the study of building of such transmitters and receivers, and the study of radio propagation of signals travelling between transmitting and receiving stations.
Triple M is an Australian commercial radio network owned and operated by Southern Cross Austereo. The network consists of 40 radio stations broadcasting a mainstream rock music format and 5 digital radio stations.
RPH Australia is the national peak representative organisation for a unique Australian network of radio reading services designed to meet the daily information needs of people who, for any reason, are unable to access printed material. It is estimated that 22% of the Australian population has a print disability.
A tuner is a subsystem that receives radio frequency (RF) transmissions, such as FM broadcasting, and converts the selected carrier frequency and its associated bandwidth into a fixed frequency that is suitable for further processing, usually because a lower frequency is used on the output. Broadcast FM/AM transmissions usually feed this intermediate frequency (IF) directly into a demodulator that converts the radio signal into audio-frequency signals that can be fed into an amplifier to drive a loudspeaker.
FM broadcasting is the method of radio broadcasting that uses frequency modulation (FM). Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio. FM broadcasting offers higher fidelity—more accurate reproduction of the original program sound—than other broadcasting techniques, such as AM broadcasting. It is also less susceptible to common forms of interference, having less static and popping sounds than are often heard on AM. Therefore, FM is used for most broadcasts of music and general audio. FM radio stations use the very high frequency range of radio frequencies.
WCRB is a non-commercial radio station licensed to Lowell, Massachusetts, which serves the Greater Boston area. It broadcasts classical music. Its studios are located in Brighton, and its transmitter is located west of Andover.
CHKT is a commercial AM radio station in Toronto, Ontario, Canada. The station, owned by the Fairchild Group service, airs mainly Cantonese and Mandarin Chinese programs as well as weekend shows in the following languages: Cambodian, Filipino, German, Hindi, Hungarian, Italian, Korean, Lao, Macedonian, Polish, Punjabi, Russian, Thai and Vietnamese. CHKT's studios at 151 Esna Park Drive, Unit 26 in Markham.
WTIC-FM is a commercial radio station in Hartford, Connecticut. It is owned by Audacy, Inc. and broadcasts a hot adult contemporary radio format. The station's studios and offices are located on Executive Drive in Farmington.
Public radio broadcasting began in Singapore in April 1925, after the Amateur Wireless Society of Malaya obtained a temporary license to broadcast. Radio Singapura was established as the first local mass market radio service in 1959. Subsequently, on 15 February 1963, before the withdrawal of the British Armed Forces, and after the merger with Malaya, Singapore's first television service began as Televisyen Singapura under its owner, Radio Television Singapore (RTS).
CHIN is a commercial AM radio station in Toronto, Ontario, Canada. It is owned by CHIN Radio/TV International, and broadcasts a multilingual radio format, with programs in Mandarin, Cantonese, Portuguese and other languages. It formerly utilized an FM rebroadcaster at 91.9 MHz, CHIN-1-FM, originally used to fill in reception gaps in parts of Greater Toronto; CHIN-1-FM now broadcasts a separate schedule of ethnic programming, no longer simulcasting CHIN. In addition, there is a full-power FM station on 100.7 MHz, CHIN-FM, which offers a third ethnic programme schedule. CHIN, CHIN-1-FM and CHIN-FM have their radio studios on College Street in the Palmerston-Little Italy neighbourhood of Toronto.
4MBS Classic FM is an Australian community radio station which broadcasts classical music from Brisbane at a frequency of 103.7 MHz, as well as on digital radio and online.
SBS Audio is an Australian radio network and audio service owned by the Special Broadcasting Service directed towards newly arrived immigrants in Australia. It began as two stations based in Melbourne and Sydney, set up to provide pre-recorded information about the then-new Medibank health care system in languages other than English. Nowadays, the network targets the estimated 4+ million Australians who speak a language other than English at home with programs in 68 languages.
Digital broadcast radio in Australia uses the DAB+ standard and is available in Sydney, Melbourne, Brisbane, Perth, Adelaide, Canberra, Darwin and Hobart. However, after 11 years, regional large cities such as Townsville and Ballarat still do not have DAB. The national government owned television/radio networks, the ABC and SBS, and the commercial radio stations in each market provide many of their services and a few digital-only services on the digital platform. Australia uses the AAC+ codec provided with upgraded DAB+ standard.
The KIIS Network is an Australian commercial radio stations owned and operated by the ARN. Formerly branded as the Mix Network, the network was rebranded as the KIIS Network in 2015 following the relaunch of KIIS 101.1 Melbourne. The KIIS Network is named after KIIS-FM, a Los Angeles based radio station broadcast on the 102.7 MHz FM band.
