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...

and the hydrogen fluoride (HF) and deuterium fluoride (DF) lasers, all operating in the mid-infrared region. There is also a DF–CO2 laser (deuterium fluoride–carbon...

British also made extensive use of shore HF/DF stations, to keep convoys updated with positions of U-boats. HF/DF was also installed on American ships. The...

Second World War. High-frequency direction finding (known as huff-duff or HF/DF) played a significant role in the Allies efforts to counter the threat of...

Wullenweber, studied the design and performance of HF/DF arrays and researched the physics of HF/DF under contract to the U.S. Navy from 1947 through 1960...

finding, the high-frequency direction finding system, or HF/DF, also nicknamed "huff-duff". HF/DF also used crossing antennas, often an Adcock antenna, but...

2004). "HF/DF An Allied Weapon against German U-boats 1939–1945" (PDF). Retrieved 2008-01-26. A paper on the technology and practice of the HF/DF systems...

Cold War for HF/DF direction finding of high priority targets. The worldwide network, known collectively as "Iron Horse", could locate HF communications...

locations during the Cold War for high frequency radio direction finding (HF/DF) and signals intelligence. In the Joint Electronics Type Designation System...

installation. A VHF close-range DF platoon consisted of: Two or three DF teams equipped with VHF DF sets of Type D, also an HF transceiver to communicate with...

frequency (HF) radio direction finding systems to be installed on Royal Navy convoy escort ships. Such direction finding systems were referred to as HF/DF or...

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, track it and attack...

from the receiver through the position of the signal of interest. (See HF/DF.) Knowing the compass bearing, from a single point, to the transmitter does...

the same name), was aboard U-96 at the time. Following installation of HF/DF in December 1941, Lulworth escorted convoys OS 15, SL 98, OS 20, SL 103...

The hydrogen fluoride laser is an infrared chemical laser. It is capable of delivering continuous output power in the megawatt range. Hydrogen fluoride...

as well as close the mid-Atlantic gap. High frequency direction finding (HF/DF), including shipborne sets, to pinpoint the location of an enemy submarine...

UPD-501 radar detector 1 × SRD-501 HF/DF DELEX: 1 × SLQ-501 intercept (CANEWS) 1 × ULQ-6 jammer 1 × SRD-501 HF/DF Armament Original: 1 × FMC 3-inch/50...

susceptible to intercept. In World War II, high frequency direction finding (HF/DF or "Huff-duff) was used by Allied escort vessels to detect submarines making...

of mucus Huffing, a forfeit in checkers HUF (disambiguation) Huff-Duff (HF/DF) High Frequency Direction Finder Huff-Daland Aero Corp This disambiguation...

also being planned. This consisted of a set of tracking stations using HF/DF radio direction finders. Their aircraft radios were modified to send out...

carried High Frequency radio Direction Finding equipment (abbreviated to HF/DF and known as "Huff-Duff") to assist in the location of U-boats. The rescue...

between friendly and enemy targets and a high frequency direction finder (HF/DF) was carried on a short pole mainmast aft. Six Bays were completed to different...

reflections from sound waves beamed into the water. A Type 277 search radar and a HF/DF radio direction finder rounded out the Castles' sensor suite. Carisbrooke...

tensions with the Japanese. The Navy started implementing high frequency DF (HF/DF) at eleven planned locations, primarily on the Atlantic Coast. The first...

reflections from sound waves beamed into the water. A Type 277 search radar and a HF/DF radio direction finder rounded out the Castles' sensor suite. Allington...

reflections from sound waves beamed into the water. A Type 277 search radar and a HF/DF radio direction finder rounded out the Castles' sensor suite. Bamborough...

U-boats vulnerable to a device called the High Frequency Direction Finder (HF/DF or Huff-Duff), which allowed Allied naval forces to determine the location...

reflections from sound waves beamed into the water. A Type 277 search radar and a HF/DF radio direction finder rounded out the Castles' sensor suite. Denbigh Castle...

co-operation with shipborne "Huff Duff". Defending Convoy SC 104, VLRs guided by HF/DF drove off three shadowing U-boats in one day, 16 October. They bettered...

alternative airfield location on Coppermine Bay Bluie West Three: Simiutak HF/DF station at 60°41′N 46°34′W / 60.683°N 46.567°W / 60.683; -46.567 (Bluie...