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A radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna. Radio waves are electromagnetic waves with frequencies between about 30 Hz and 300 GHz. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the ...
Commercial Radio Hong Kong (CRHK, Chinese: 香港商業電台, also known as Hong Kong Commercial Broadcasting Company Limited, is one of the two commercial radio broadcasting companies in Hong Kong, alongside Metro Radio Hong Kong. CRHK offers a variety of radio programs, including news and weather reports, music, and cultural arts.
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During the early history of radio many countries had only a few high power radio stations, operated either by the government or large corporations, which broadcast to the population or to other countries. Because of the large number of transmission sites, this list is not complete.
Carrier current transmission, originally called wired wireless, employs guided low-power radio-frequency signals, which are transmitted along electrical conductors. The transmissions are picked up by receivers that are either connected to the conductors, or a short distance from them.
A wiring diagram for parts of an electric guitar, showing semi-pictorial representation of devices arranged in roughly the same locations they would have in the guitar. An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing.
The development of HD Radio digital sub-channels for FM stations led to a second expanded use for translators. Due to a lack of commercial receivers capable of receiving HD transmissions, a translator is now permitted to retransmit the programming of an FM station's secondary ("HD2") or tertiary ("HD3") signals.