RAF Trimingham

Remote Radar Head Trimingham or RRH Trimingham is a TPS-77 radar station situated on the coast in the English county of Norfolk.[1] The site is located on the coast road between Cromer and Mundesley, 1 kilometre east of the village of Trimingham. The radar station is a satellite station of RAF Neatishead (grid reference TG289382). This radar station is controlled and maintained by a section of Radar Technicians and Operators and supported by a team of Ground Engineers. Trimingham provides extensive coverage of the East coast of the United Kingdom and helps contribute to the recognised air picture and defence of the United Kingdom. The type 93 became operational on the site in April 1997.

RRH Trimingham
Part of RRH Neatishead
Near Trimingham, Norfolk in England
Radar dome at RRH Trimingham.
RAF Trimingham
Shown within Norfolk
Coordinates52°53′34″N 001°24′02″E
TypeRemote Radar Head
Site information
OwnerMinistry of Defence
OperatorRoyal Air Force
Controlled byNo. 1 Group (Air Combat)
ConditionOperational
Radar typeLockheed Martin AN/TPS-77 (Type 92) Air Defence Radar
Site history
Built1941 (1941)
In use1941 – present
Garrison information
OccupantsRadar Flight (South)

History

The radar station was established on the cliff top at Trimingham by the British Army in the latter part of 1941.[2] It was used to detect German E-Boats and low flying aircraft and was then equipped with a CD Mk.4 radar. The station also operated as an Oboe Navigation Station. Oboe worked using two stations at different and well-separated locations in England to transmit a signal to a Mosquito Pathfinder bomber carrying a radio transponder. The transponder reflected the signals, which were then received by the two stations. The round-trip time of each signal gave the distance to the bombers and guided them to their target.[3]

In April 1942, Trimingham was transferred from the authority of the War Office over to the Air Ministry. The site had now been installed with a Chain Home Extra Low (CHEL)/CD Type 54 radar on a 200 foot (61 m) tower. By 1945 the 'Oboe' equipment had been removed. In 1947 Trimingham was placed in the Northern Signals Area under No 90 Group. Between 1948 and 1949 the site was placed under care and maintenance.[2]

In January 1949 the site was re-activated and in 1950 was renamed No 432 Signals Unit (No 432 SU). In June 1950 RAF Trimingham was selected to be a Centimetric Early Warning Station (CEW). Between this event and 1961 the radar station had various systems installed at the site and operated constantly as part of the UK’s ROTOR early warning systems until February 1964 when the site was mothballed. By 1965 the station had been largely dismantled and all the radar arrays had been removed apart from the Type 54 behind Beacon Hill Cottage but that had been removed by 1972.[2]

In 1981 RAF Trimingham was closed and the site had been sold and the guardhouse converted into a private house.[2]

1980's to date

By the latter part of the 1980s the now Ministry of Defence decided to re-purchase the site.[2] The RAF installed a Marconi Type 91 Martello radar acting as a Ready Platform (along with RAF Hopton and RAF Weybourne) for the UKADGE Series II (United Kingdom Air Defence Ground Environment) Radar System controlled from the R3 underground control centre at RAF Neatishead. The guardhouse was converted into staff accommodation and offices and basic mess facilities. In May 1996 the Marconi Type 91 'Martello' radar at Trimingham was sold to the Turkish Ministry of Defence and it was replaced by what used to be known as No 86 Signals Unit, with a Type 93 (Plessey type ADGE-305, NATO designation TGRI 50011) that had been moved from Hopton when that base was closed.[2] The Type 93 was originally a mobile installation (however it never actually obtained UK Dept of Transport authorisation to be allowed on UK roads under its own power and anytime it had to be moved, civilian low-loader transport specialists had to be contracted in), but at Trimingham it was fixed to a permanent mounting, due to constant cracking issues with the frame and mobile trailer. The Kevlon dome composed of irregular polygons erected around it and became known locally as the Trimingham golf ball.[4]

The Type 93 was replaced by the Type 101 radar, which was itself replaced by the TPS-77 radar which has increased capabilities to detect targets in the vicinity of the now prolific wind farms along the North Sea coast.[5] According to Minister Philip Dunne, the TPS-77 radar at this station has reached Initial operation capability.[6] Today the TPS-77 feeds constant data back to the Control and Reporting Centres (CRC's) at RAF Boulmer in Northumberland and RAF Scampton in Lincolnshire. RAF Neatishead has now been downgraded to a remote radar head which is actually at Trimingham. Neatishead only being retained as the circuits from Trimingham pass through Neatishead.[7]

Controversy

In November 2006, the station became involved in controversy when motorists on the coast road blamed the station for causing car engines and lights to cut out. Speedometer dials swung up to 150 mph as motorists drove past, and a local garage owner who runs the nearest garage at Mundesley, said he had dealt with 30 calls over a couple of months.[8]

gollark: - calculation of numbers- symbolic maths things somewhat- equation solving (symbolically and numerically)- bignums for utter factorial calculation- higher precision numbers than uncool doubles, if available somehow- infix notation
gollark: … isize and usize?
gollark: HelloBoi, you are committing heresy.
gollark: Perhaps.
gollark: Nope.

References
  1. OS Explorer map 25 in (Edition A 1997) – "Norfolk Coast East". ISBN 0-319-21727-2.
  2. "Trimingham Rotor Radar Station". Subterranea Britannica. Retrieved 28 February 2020.
  3. Jones, F. E. (1946). "Oboe: A precision ground-controlled blind-bombing system". Journal of the Institution of Electrical Engineers - Part IIIA: Radiolocation. 93 (2): 496. doi:10.1049/ji-3a-1.1946.0133.
  4. "New radars will have to be built on north Norfolk coast because of huge wind farm". Eastern Daily Press. 7 April 2019. Retrieved 28 February 2020.
  5. "Remote Radar Head (RRH) Trimingham". RAF. Archived from the original on 24 March 2015. Retrieved 28 February 2020.
  6. "Radar: Written question". Hansard. Retrieved 28 February 2020.
  7. "A history of RAF Trimingham". RAF. Archived from the original on 30 April 2017. Retrieved 28 February 2020.
  8. "Drivers blame RAF radar as dials go haywire". The Telegraph. 21 February 2006. Retrieved 28 February 2020.
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