Y service
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The "Y" service was a network of British signals intelligence collection sites, the Y-stations. The service was established during the First World War and used again during the Second World War. The s
Arkley View, 1943
High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder introduced in World War II. High frequency refers to a radio band t
Y service
…attached to the India outpost of the Intelligence Corps, the Wireless Experimental Centre (WEC) outside Delhi. Specially constructed Y stations undertook high-frequency direction finding (D/F) of wireless transmissions. This became particularly important in the Battle of the Atlantic where locating U-boats was vital. Admiral Dönitz told…
FH4 "Huff-duff" equipment on the museum ship HMS Belfast
"Super Duff" equipment on the museum ship HMS Belfast. The circular indicator provides a direct reading of the relative bearing from-which signals are received - red numerals for to port of the ship, green for to starboard