About: IFF Mark III

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IFF Mark III, also known as ARI.5025 in the UK or SCR.595 in the US, was the Allied Forces standard identification friend or foe (IFF) system from 1943 until well after the end of World War II. It was widely used by aircraft, ships, and submarines, as well as in various adaptations for secondary purposes like search and rescue. 500 units were also supplied to the Soviet Union during the war.

Attributes	Values
rdfs:label	IFF Mark III (en)
rdfs:comment	IFF Mark III, also known as ARI.5025 in the UK or SCR.595 in the US, was the Allied Forces standard identification friend or foe (IFF) system from 1943 until well after the end of World War II. It was widely used by aircraft, ships, and submarines, as well as in various adaptations for secondary purposes like search and rescue. 500 units were also supplied to the Soviet Union during the war. (en)
foaf:depiction
dcterms:subject	World War II British electronics Military equipment introduced from 1940 to 1944 Identification friend or foe
Wikipage page ID	56065720 (xsd:integer)
Wikipage revision ID	1112362364 (xsd:integer)
Link from a Wikipage to another Wikipage	Royal Navy World War II British electronics Bracknell Hugh Dowding Pembrokeshire Robert Hanbury Brown Radar Radar display Frederic Calland Williams GL Mk. I radar Short Stirling Identification friend or foe Paratrooper Bristol Beaufighter Bristol Blenheim Type 79 radar AMES Type 7 Aircraft carrier Allies of World War II Military equipment introduced from 1940 to 1944 Ernest King Fleet Air Arm P-51 Mustang Pacific War Cavity magnetron Radio direction finder ASV Mk. II radar Hazeltine Corporation Chain Home Aerodynamic drag Blind Approach Beacon System Identification friend or foe Supermarine Spitfire B. V. Bowden, Baron Bowden Soviet Union Ferranti IFF Mark X Korean War Anti-aircraft cruiser Microwave Operation Avalanche RAF Army Cooperation Command Rebecca/Eureka transponding radar World War II Würzburg radar Search and rescue Secondary surveillance radar Very high frequency Night fighter Cathode-ray tube IFF Mark II UHF US Army Air Force Plan-position indicator Unipole Horizontally polarized US Naval Research Laboratory
Link from a Wikipage to an external page	https://books.google.com/books%3Fid=jWIe46x13p0C https://books.google.com/books%3Fid=uYgsr3exvS4C http://jproc.ca/sari/sariff.html https://books.google.com/books%3Fid=H9W-DAAAQBAJ https://books.google.com/books%3Fid=Mj9b-Eki9PIC&pg=PA55 https://books.google.com/books%3Fid=fX2wCwAAQBAJ&pg=PA141 https://books.google.com/books%3Fid=xwmH6-q5O5AC&pg=PA455
sameAs	IFF Mark III IFF Mark III
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thumbnail	wiki-commons:Special:FilePath/A_Supermarine_Spitfire_Mk_IXE_of_No._412_Squadron_RCAF,_armed_with_a_250-lb_GP_bomb_under_each_wing,_taxies_out_for_a_sortie_at_Volkel,_Holland,_27_October_1944._CL1451.jpg?width=300
has abstract	IFF Mark III, also known as ARI.5025 in the UK or SCR.595 in the US, was the Allied Forces standard identification friend or foe (IFF) system from 1943 until well after the end of World War II. It was widely used by aircraft, ships, and submarines, as well as in various adaptations for secondary purposes like search and rescue. 500 units were also supplied to the Soviet Union during the war. Mark III replaced the earlier Mark II which had been in service since 1940. Mark II had an antenna that received signals from radar systems, amplified them, and returned them. This caused the blip on the radar display to become larger, indicating a friendly aircraft. As the number of radar systems on different frequencies proliferated through the mid-war period, the number of models of Mark II had to do the same. Aircraft could never be sure their IFF would respond to the radars they flew over. Freddie Williams had suggested using a single separate frequency for IFF as early as 1940, but at that time the problem had not become acute. The introduction of microwave radars based on the cavity magnetron was the main impetus for adopting this solution, as the Mark II could not easily be adapted to respond on these frequencies. In 1942, a new frequency band, between 157 and 187 MHz, just below most VHF radars, was selected for this role. The only downside to this design is that the radar itself no longer provided the trigger signal for the transponder, so a separate transmitter and receiver was needed at the radar stations. The Mark III began to replace the Mark II in 1942 and 1943, in a somewhat lengthy switchover period. It was also used as the basis for several other transponder systems such as Walter and Rebecca/Eureka, which allowed suitably equipped aircraft to home in on locations on the ground. These found use for dropping paratroopers and supplies in Europe, locating downed aircraft, and other roles. Several newer IFF designs were trialled, but none of them offered enough of an advantage to warrant a switchover. Mark III was replaced by IFF Mark X over an extended time starting in 1952. (en)
prov:wasDerivedFrom	wikipedia-en:IFF_Mark_III?oldid=1112362364&ns=0
page length (characters) of wiki page	24797 (xsd:nonNegativeInteger)

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