ThePinetree Linewas a series ofradarstations located across southern Canada at about the50th parallel north,along with a number of other stations located on theAtlanticand Pacific coasts. Run byNorth American Aerospace Defense Command(NORAD) (after its creation), over half were staffed byUnited States Air Forcepersonnel with the balance operated by theRoyal Canadian Air Force.The line was the first coordinated system for early detection of aSovietbomber attack on North America. Its radar technology quickly became outdated, and the line was in full operation only for a short time.
Static display of an AN/FPS 508 radar antenna, one of the types used on the Pinetree Line. The antenna rotated at 5 revolutions per minute. The system could detect aircraft up to 200 mi (320 km) away and at altitudes of 100,000 ft (30,000 m). This antenna is on display atAir Force Heritage Museum and Air Park,Winnipeg
Plans for what would become the Pinetree Line were underway as early as 1946 within thePermanent Joint Board on Defense(PJBD), a Canadian-U.S. organization. However, the costs of running such a system in thepost-warera was too high, and instead Canada concentrated on the areas aroundOntarioandQuebec,while the United States set up stations in theMidwestand along theeastern seaboard.
With the successful test of anatomic bomb in the USSR,plans changed considerably. In 1949 Congress agreed to a $161 million construction program in co-operation with the RCAF, for a continuous line of stations across southern Canada. The USAF'sContinental Air Commandand the RCAF met in October 1950 to start planning, and in January 1951 the PJBD presentedRecommendation 51/1 for the Extension of the Continental Radar Defence System.The USAF later requested an additional set of six (potentially) mobile stations to provide low-level coverage. Later, it was learned the original radar systems performed better than expected, hence a number of the mobile sites were never deployed.
The system was eventually deployed as a series of 33 main stations and 6 smaller "gap fillers". The majority of these ran in a line at about the53rd parallelin the west (to offer coverage of major Canadian cities) and about the50th parallelin the east. A second line ran up the eastern seaboard from the southern tip ofNova Scotiato the southern tip ofBaffin Island.Of these, 22 of the main stations and all of the gap fillers were paid for by the USAF, leaving 11 to the RCAF. However 16 of the main stations were staffed by RCAF personnel. On 1 January 1955, the system was officially handed over to RCAF command, and over time an additional 10 stations were added. The stations on the east coast used thePole Vaultsystem for communication.
Saint Anthony Air Station, Newfoundland in July 1961. The main radar is centered, the Pole Vault antennas are on the right.
The Pinetree Line had several technical problems that limited its usefulness almost immediately. For one, the system used a simple pulse radar technique, which made it unable to detect targets close to the ground due toradar clutteras well as being trivially easy to jam using the recently-introducedcarcinotrontube. Another was that its location near population centres meant it offered only a last minute warning, and as the USSR moved tojet-powered bombers the warning time was reduced. Studies were already underway in 1951 to build a series ofDopplerbistatic radarstations somewhat farther north, which would develop into theMid-Canada Line.By 1957, just over a year after the Mid-Canada Line was operational, a more advanced long-rangesearch radar,mainly in theCanadian northandAlaskawere deployed comprising theDistant Early Warning Line.
The Pinetree stations were kept operational during this period, and most underwent modifications as a part of the deployment of theSemi-Automatic Ground Environment (SAGE).SAGE dramatically reduced the workload at the stations, cutting staff requirements by well over half. By the later 1950s some were being mothballed as newer systems came on line to the north. Nevertheless, many of the Pinetree stations were kept operational into the 1980s, particularly on the Atlantic and Pacific coasts.
A Handbook of Aerospace Defense Organization 1946–1980,by Lloyd H. Cornett and Mildred W. Johnson, Office of History, Aerospace Defense Center, Peterson Air Force Base, Colorado
This article incorporatespublic domain materialfrom theAir Force Historical Research Agency