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- High-frequency_direction_finding abstract "High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is the common name for a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can efficiently communicate over long distances; for example, between U-boats and their land-based headquarters. HF/DF was primarily used to catch enemy radios while they transmitted, although it was also used to locate friendly aircraft as a navigation aid. The basic technique remains in use to this day as one of the fundamental disciplines of signals intelligence, although typically incorporated into a larger suite of radio systems and radars instead of being a stand-alone system.Huff-duff used a set of antennas to receive the same signal in slightly different locations or angles, and then used the slight differences in the signal to display the bearing to the transmitter on an oscilloscope display. Earlier systems used a mechanically rotated antenna (or solenoid) and an operator listening for peaks or nulls in the signal, which took considerable time to determine. Huff-duff's speed allowed it to catch fleeting signals, such as those from the U-boat fleet.The system was initially developed by Robert Watson-Watt starting in 1926, although many of the practical elements were not developed until the late 1930s. Huff-duff units were in very high demand, and there was considerable inter-service rivalry involved in their distribution. An early use was by the RAF Fighter Command as part of the Dowding system of interception control, while ground-based units were also widely used to collect information for the Admiralty to locate U-boats. Between 1942 and 1944, smaller units became widely available and were common fixtures on Royal Navy ships. It is estimated huff-duff contributed to 24% of all U-boats sunk during the war.The basic concept is also known by several alternate names, including Cathode-Ray Direction Finding (CRDF), Twin Path DF, and for its inventor, Watson-Watt DF or Adcock/Watson-Watt when the antenna is considered.".
- High-frequency_direction_finding thumbnail HMS_Belfast_-_Huff_Duff.jpg?width=300.
- High-frequency_direction_finding wikiPageExternalLink histarticles.html.
- High-frequency_direction_finding wikiPageExternalLink HFDF1998.pdf.
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- High-frequency_direction_finding wikiPageWikiLink Antenna_(radio).
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- High-frequency_direction_finding wikiPageWikiLink Battle_of_the_Atlantic_(1939-1945).
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- High-frequency_direction_finding wikiPageWikiLink Category:Radio_direction_finding.
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- High-frequency_direction_finding wikiPageWikiLink National_Physical_Laboratory_(United_Kingdom).
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- High-frequency_direction_finding wikiPageWikiLink U-boat.
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- High-frequency_direction_finding wikiPageWikiLink File:HMS_Belfast_-_Huff_Duff.jpg.
- High-frequency_direction_finding wikiPageWikiLink File:HMS_Belfast_-_SuperDuff.jpg.
- High-frequency_direction_finding wikiPageWikiLinkText ""huff-duff"".
- High-frequency_direction_finding wikiPageWikiLinkText "''huff-duff''".
- High-frequency_direction_finding wikiPageWikiLinkText "DFed".
- High-frequency_direction_finding wikiPageWikiLinkText "HF/DF".
- High-frequency_direction_finding wikiPageWikiLinkText "HUFF-DUFF".
- High-frequency_direction_finding wikiPageWikiLinkText "High Frequency Direction Finder".
- High-frequency_direction_finding wikiPageWikiLinkText "High-frequency direction finding".
- High-frequency_direction_finding wikiPageWikiLinkText "High-frequency direction finding#Pipsqueak".
- High-frequency_direction_finding wikiPageWikiLinkText "Huff-Duff".
- High-frequency_direction_finding wikiPageWikiLinkText "high-frequency direction finding".
- High-frequency_direction_finding wikiPageWikiLinkText "single loop antenna".
- High-frequency_direction_finding wikiPageWikiLinkText "very high-frequency direction finding (VDF)".