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Y-stations
Y-stations were British signals intelligence collection sites initially established during World War I〔(Y-stations in World War I )〕 and later used during World War II. These sites were operated by a range of agencies including the Army, Navy and RAF plus the Foreign Office (MI6 and MI5), General Post Office and Marconi Company receiving stations ashore and afloat.
==Background==
The "Y" stations tended to be of two types, Interception and Direction Finding. Sometimes both functions were operated at the same site with the direction finding (D/F) hut being a few hundred metres away from the main interception building because of the need to minimise interference. These sites collected radio traffic which was then either analysed locally or if encrypted passed for processing initially to Admiralty Room 40 in London and during World War II to the Government Code and Cypher School established at Bletchley Park in Buckinghamshire.
In World War II a large house called "Arkley View" on the outskirts of Barnet (now part of the London Borough of Barnet) acted as a data collection centre at which traffic was collated and passed to Bletchley Park, it also acted as a "Y" station. Many amateur radio ("ham") operators supported the work of the "Y" stations, being enrolled as "Voluntary Interceptors". Much of the traffic intercepted by the "Y" stations was recorded by hand and sent to Bletchley on paper by motorcycle couriers or, later, by teleprinter over post office land lines.〔Nicholls, J., (2000) ''England Needs You: The Story of Beaumanor Y Station World War II'' Cheam, published by Joan Nicholls〕
The name derived from "Wireless Interception" or "WI". The term was also used for similar stations attached to the Intelligence Corps' India outpost, the Wireless Experimental Centre (W.E.C.) outside Delhi.
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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