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WSR-74
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WSR-74 radars were Weather Surveillance Radars designed in 1974 for the National Weather Service. They were added to the existing network of the WSR-57 model to improve forecasts and severe weather warnings. Some have been sold to other countries like Australia, Greece, and Pakistan.
== Radar properties ==
There are two types in the WSR-74 series, which are almost identical except for operating frequency.〔(【引用サイトリンク】title=Advanced Search - ITS )〕 The WSR-74C (used for local warnings) operates in the C band, and the WSR-74S (used in the national network) operates in the S band (like the WSR-57 and the current WSR-88D). S band frequencies are better suited because they are not attenuated significantly in heavy rain while the C Band is strongly attenuated.
The WSR-74C uses a wavelength of 5.4 cm.〔Paul Sirvatka. "WSR - Weather Surveillance Radar." Radar. College of DuPage. 4 Apr. 2006 ( ).〕 It also has a dish diameter of 8 feet, and a maximum range of 579 km (313 nm) as it was used only for reflectivities (see Doppler dilemma).
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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