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Early Days
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Saved by Alan Hartley-Smith
on September 17, 2010 at 7:06:15 pm
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Pre-WWII
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For the Committee for the Scientific Survey of Air Defence Robert Watson-Watt, Superintendent of the Radio Research Laboratory, produced a paper “Detection and Location of Aircraft by Radio Methods”. A practical test followed, on 26 February, in which a |Heyford bomber, flying through the short-wave radiations of the BBC’s Empire station at Daventry, was detected on a cathode ray tube oscilloscope display
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1935 |
Experimental work carried out at Orfordness and then Bawdsey Manor resulted in a decision to build five RDF stations to cover the approach to London via the Thames estuary, the Chain Home (CH) stations. |
1937 |
The success of the first five CH stations promoted the ordering of twenty more, and for all of these the Marconi Company provided the transmitter ‘curtain’ arrays, and subsequently for the West Coast and other chains. |
1939 |
By the outbreak of war Britain was ringed with a chain of CH stations |
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Dr. JT Randall and HAH Boot of Birmingham University constructed the first cavity magnetron for the generation of high-power centimetric waves. |
Wartime
1940 |
To combat low-flying bombers the Chain Home Low (CHL) station was devised comprising a power-turned, five-bay, four-stacked array mounted either on a 20ft gantry or 185ft tower. |
1940/41 |
Baddow Laboratories taken over by Air Ministry, Admiralty and also became an operational RAF station.
Instrument Section plus Eckersley Group became the Kemp Group
The Vacuum Laboratories take over magnetron development and production
The Company was involved in the fitting of RDF for early warning against air attack to Navy capital ships. Modified Air-to-Surface metric equipment fitted to smaller ships. A crash programme to develop a small set also capable of detecting surfaced submarines was delivered in 1941. An improved form of aircraft warning system was the Type 281
Two senior engineers NE Davis and OE Keall were seconded to the Admiralty to devise counter-measures to the German radars sited along the coast of France...
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1942 |
Following improvements to the magnetron the Chelmsford factory produced amplifier units for a new naval radar Type 271 There was also a new centimetric ASV for the RAF.
Magnetron production was moved to a new building at Waterhouse Lane enabling a delivery rate of several hundred per month.
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1943 |
Baddow in 1943 - a personal diary |
1945 |
For D-Day Marconi designed, developed and manufactured from research carried out by the TRE an airborne system, code named Bagful, to intercept and record the frequency and approximate positions of enemy radar stations which was in large-scale operation prior to the invasion to build up a dossier. On June 6th a multiplicity of jamming stations, in an operation code named Carpet paralysed the Germans radar networks. Also for the invasion Marconi Marine provided servicing for all radio, echo sounding and radar equipments. |
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