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...

was picked up by ground-based high-frequency direction finding (HFDF, "huff-duff") receivers. Using three HFDF measurements, observers could determine...

II's Battle of the Atlantic. It is estimated that the UK's advanced "huff-duff" systems were directly or indirectly responsible for 24% of all U-boats...

Duff's television fanbase could be migrated to film." Following her success from Lizzie McGuire, Richard Huff of the New York Daily News called Duff "a...

Look up huff in Wiktionary, the free dictionary. Huff or huffing may refer to: Huff (surname), a list of people with the surname Huff Township, Spencer...

or "huff-duff"). Although well publicized at the time, the system's enormous military potential was not developed until the late 1930s. Huff-duff allowed...

reason for this successful Axis period was the British lack of radar and huff-duff equipped ships which meant that the U-boats were very hard to detect when...

read the U-boat Enigma traffic. But high-frequency direction finding ("huff-duff") was still able to detect U-boats by analysis of radio transmissions...

490 MHz (to jam the Germans' FuG 202 and 212 AI radars) and 530–600Mhz. Huff-Duff – Allied HF/DF High Frequency Direction Finding. Identification Friend...

identification, Dowding pressed for a supply of high-frequency direction finding (huff-duff) sets, which could locate the fighters using signals broadcast from their...