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High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can effectively communicate over long distances; for example, between U-boats and their land-based headquarters.
Maxwell K. Goldstein (January 15, 1908 – February 18, 1980) was a first generation Jewish-American scientist and engineer who was instrumental in the development and deployment of high-frequency direction finding by the United States Navy during the Second World War.
Initially three U Adcock HF DF stations were set up in 1939 by the General Post Office. With the declaration of war, MI5 and RSS developed this into a larger network. One of the problems with providing coverage of an area the size of the UK was installing sufficient DF stations to cover the entire area to receive skywave signals reflected back ...
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Centerboard was a network for processing HF/DF information. [9] The security classification guide that covered all three programs was cancelled in January 2009. [ 10 ] [ 11 ] Later, the programs Unitary DF and Crosshair sought to unify the military's HF direction finding information into a single data collection network. [ 12 ]
The AN/FLR-9 is a type of very large circularly disposed antenna array, built at eight locations during the Cold War for HF/DF direction finding of high priority targets. The worldwide network, known collectively as "Iron Horse", could locate HF communications almost anywhere on Earth.
The last two FRD-10 HF/DF arrays were installed in 1971 for the Canadian Forces in Gander, Newfoundland) and Masset, British Columbia). After the Hanza array was decommissioned in 2006, the Canadian Armed Forces became the operators of one of the last two existing FRD-10 arrays.
Martin Lee, a barrister and founder of United Democrats of Hong Kong, speaking at the Henry Jackson Society—Hong Kong Watch joint seminar in London in September 2018. The Henry Jackson Society (HJS) is a trans-Atlantic foreign policy and national security think tank, based in the United Kingdom.