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transmitter station
A transmitter station or transmission facility is an installation used for transmitting radio frequency signals for wireless communication, broadcasting, microwave link, mobile telephone or other purposes.
==Choice of location==
The location may be chosen to fit the coverage area 〔European Broadcasting Union:Technical Monogram No.3104-1965 Site selection (Edited by RK.H.Kaltbeitzer),Chapter I, Brussels〕 and for VHF-UHF-applications line of sight consideration. For lower frequencies a location with good ground conductivity is required. In case of microwave link chains, stations should be in observable ranges of each other. (see Earth bulge) Computer programmes for the terrain profile and abacs are used in addition to on site observations. Avoidance of industrial noise is also taken into consideration. Another parameter may be the government regulations concerning public health requiring a minimum distance to human habitation. The distance depends on the power and the frequency of the transmitting signal. Low power stations may be in cities; higher power stations are always in rural areas. Most of the stations (especially high frequency stations) are at high altitudes. So, both the minimum distance regulations and the line of sight criteria are met.
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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