High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced...

Direction finding (DF), radio direction finding (RDF), or radiogoniometry is the use of radio waves to determine the direction to a radio source. The source...

enabled effective high frequency (HF) radio direction finding systems to be installed on Royal Navy convoy escort ships. Such direction finding systems were...

connecting the HF transceiver. High-frequency Active Auroral Research Program High-frequency direction finding High Frequency Internet Protocol Radio propagation...

deployment of high-frequency direction finding by the United States Navy during the Second World War. High-frequency direction finding (known as huff-duff...

important developments was ship-borne direction-finding radio equipment, known as HF/DF (high-frequency direction-finding, or Huff-Duff), which started to...

Frobisher Bay, also known as NRS Frobisher Bay, was a military high-frequency direction-finding station located on Baffin Island at what is now Iqaluit, Nunavut...

was not always able to read the U-boat Enigma traffic. But high-frequency direction finding ("huff-duff") was still able to detect U-boats by analysis...

outside Delhi. Specially constructed Y stations undertook high-frequency direction finding (D/F) of wireless transmissions. This became particularly important...

Watson-Watt introduced the next major advance in direction finding, the high-frequency direction finding system, or HF/DF, also nicknamed "huff-duff". HF/DF...

for more than two years. Three days into the "Black Pit", high-frequency direction finding intercepts a German transmission and Greyhound identifies a...

shipping, improved convoy and anti-submarine tactics such as high-frequency direction finding and the Hedgehog anti-submarine system began to take a toll...

send out a 1 kHz tone which was picked up by ground-based high-frequency direction finding (HFDF, "huff-duff") receivers. Using three HFDF measurements...

Midway Island, which was responsible for operating the AN/GRD-6 High-Frequency Direction Finding (HFDF) system. This system was integral to both the Eastern...

intelligence (ELINT) High-frequency direction finding (nicknamed huff-duff) is the common name for a type of radio direction finding employed especially...

World War II. The advances in signals intelligence such as high-frequency direction finding, in cryptological intelligence such as Ultra, and in detection...

Sonar was installed on a number of ships along with radar and high-frequency direction finding ("Huff-Duff") to detect surfaced submarines. While sonar was...

Station in Florida. In 1939 Ascension became important as a high-frequency direction finding radio station covering trade routes. Wideawake Airfield (named...

This led to the 1920s development of a system later known as high-frequency direction finding (HFDF or "huff-duff"). Although well publicized at the time...

Furthermore, replies from the boats enabled the Allies to use High-frequency direction finding (HF/DF, called "Huff-Duff") to locate a U-boat using its radio...

of its wiring. In addition, the Americans saw the British's high-frequency direction finding (HF/DF) system, which allowed the location of radio broadcasts...

communications station at RCAF Station Gander, Its main task was high-frequency direction finding (HFDF) and communications monitoring of German U-boat radio...

began searching for U-boats in the area in late May, using high-frequency direction-finding fixes ("huff-duff") and air and surface reconnaissance. At...

government through the duration of the war for fear of espionage. A High-frequency direction finding (HFDF) station was established here by the Navy during the...

direction finding (ARDF, also known as radio orienteering, radio fox hunting and radiosport) is an amateur racing sport that combines radio direction...

reopened in 1960, forming part of the United States Navy global High Frequency Direction Finding (HFDF) network, used to track various targets around the world...

the Regia Marina. Operational from 1942 to 1943. H.F. D/F (High Frequency Direction Finding). – provided a radio position fix for the RAF up to 100 miles...

centimeter-wavelength radar. None of the ships carried HF/DF high-frequency direction finding sets. As western Atlantic coastal convoys brought an end to...

system using multilateration developed in the Czech Republic High-frequency direction finding - a similar system used by the English during world war 2 to...

Type 272 or Type 277 surface search radar was fitted, as was high-frequency direction finding (HF/DF) gear. The ships' sonar outfit was Type 145 and Type...