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Note, some sections below are redacted. Higher level access may be required to view.

REF: 221B/A

INTELLIGENCE DIVISION

ORFORD NESS FACILITY

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TOP SECRET OPERATION OVERVIEW: ANGLIAN MIST

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******* 1961

Operative reports *******************************************. American over-the-horizon (OTH) MADRE, Chesapeake Bay, is able to “see” aircraft at ranges of 1,500 to 2,000 nautical miles. 25kW pulse power.British Government express ***********************.

******* 1966

‘Anglian Mist’ bids out.

******* 1969

Plans for the scientific program, the Design Verification System Testing (DVST) are drawn by the Anglian Mist Working Group. Scientific team discovers **************************************** in design. Concerns raised about how this could be exploited.

July 1971

18 arrays of antennae (each 2,200 ft long) used to transmit and receive are installed. “The AN/FPS-95” is considered the largest, most powerful and most sophisticated OTH radar at this time. Transmit power (peak pulse) is estimated at 10MW.

September 1971

Initial testing on distant aircraft undertaken. Reports of disrupted and unresponsive controls on target. USAF expresses interest in project.

******* 1972

Control handed to USAF. Testing suspended due to power shortages as a result of strike action.

******* 1972

Testing resumes. Unexpected noise is reported when testing over land.
This ************************ before suspension. External testing reports “poor resolution in range and azimuth”.

>December 1972

SAC determine ****************************************. British Secret Service informed. The committee publishes findings in a final report suggestion the noise can be overcome with certain modifications, but will result in limitation on its expected capabilities.

June 1973

The British government is advised that the US has decided to close down the site and deactivate the system on 30th June 1973.

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