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transposer
In broadcasting, a transposer or translator is a device in or beyond the service area of a radio or television station transmitter that rebroadcasts signals to receivers which can’t properly receive the signals of the transmitter because of a physical obstruction (like a hill). A translator receives the signals of the transmitter and rebroadcasts the signals to the area of poor reception. Sometimes the translator is also called a ''relay transmitter'', ''rebroadcast transmitter'' or ''transposer.''〔R.Busi: ''High Altitude VHF and UHF broadcasting stations'', European Broadcasting Union, Bruxxeles,Brussels, 1967, p. 93.〕 Since translators are used to cover a small shadowed area, their output powers are usually lower than that of the radio or television station transmitters feeding them.
==Physical obstruction==
Reception of RF signals is sensitive to the size of obstruction in the path between the transmitter and the receiver. Generally speaking, if the size exceeds the wavelength the reception is interrupted. Since the wavelength is inversely proportional to frequency, it follows than that the higher frequency broadcast is more sensitive to objects between the transmitter and receiver. If the transmitter and the receiver were at the opposite sides of a hill, MW radio signals may be received, but UHF TV signals won’t be received at all. That’s why translators are mostly employed for VHF and UHF broadcasting (television and FM radio).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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