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Aviation History
1961
1961 - 0271.PDF
FLIGHT, 3 March 1961 275 CHT SYSTEM British Civilf Military Traffic Control THE Memorandum on the Air Estimates (reviewed in Flight lastweek) indicates that the radar advisory service for flights above 25,OOOft over the UK provided last year by RAF radars and jointcivil/military control teams has become permanent. The radars at Bishops Court in Northern Ireland, Hack Green in the Mid-lands, London/Heathrow, and Sopley (near Bournemouth) are being used; their work was described in these columns on August 19last year. Some 35,000 radar-controlled crossings of civil airways were made by military aircraft in 1960 and the radar coverage isto be extended to include the greater part of UK airspace. A further stage will be the development of more powerful radarwith computers and data-handling systems designed to intercept supersonic attackers, and this will form part of an integratedcivil/military ATC organization. Tenders for an experimental civil semi-automatic traffic control system for Southern Englandwere submitted early last year. Mandatory DMET THE Federal Aviation Agency has arranged a conference in Wash-ington on March 22 to explain and discuss DMET with all parties concerned. Papers will be read on the development and use ofDMET and on its manufacture and installation, and there will be an open discussion of The Feasibility of Requiring DME on CivilAircraft. On Federal airways there are now 725 VORs, 344 of which also have DME; and there should be 883 Vortacs by 1966.There are 236 military Tacans as well. The FAA wants all high- speed aircraft in high-density areas to be equipped with DMET—very few are at the moment—and intends eventually to require DMET for all IFR operations. Narco's New Radios DETAILS of three important new light-aircraft radios have beenreleased by Narco in America. They are the UDI-2 DMET, weighing 141b, and costing £805 ex-works; the Mk 7, 360-channeltransmitter/receiver covering the 118.0 to 135.95Mc/s band at 50kc/s spacing; and the Mk 10, which combines a Mk 7 with a190-channel receiver covering the ILS/VOR bands and communi- cations at lOOkc/s steps up to 126.9Mc/s. The DMET receiverstarted as a private venture, but was later supported by an FAA contract for a special, low-cost business aircraft DMET. The UDI-2 covers 100 frequencies selected according to thestandard pairing of VOR/DMET frequencies. The indicator on the 3in dial covers from 0 to 100 nautical miles on a logarithmicscale to give more precise indications at shorter ranges. Accuracy is stated to be 0.5 n.m. or 2.5 per cent. The equipment is alsodesigned to provide outputs for eventual addition of a pictorial presentation or a groundspeed computer. Audio output is pro- Saab have released some details of the "snap-up" lead-collision course attack from below a target. The fire-control system computes the relative positions of intercepter and target when, at 1, the radar is locked-on and directing the pilot. At 2 the pilot is instructed to pull up, arm the missile and press the firing button. At 3, the fire-control has fed the necessary information to the missile and launches it automatically. At 4, the missile strikes and the intercepter pulls away vided for station identification. The aerial is a broad blade pro-truding only 3in from the aircraft skin. The UDI-2 will be marketed about the middle of this year.Certain airports in the USA are already offering simplified approach patterns and lower ceilings for DMET-equippedaircraft. In accordance with Federal Aviation Agency intentions tochange over to 50kc/s channed-spacing as soon as possible (clamorous complaints deterred the Agency from doing so lastyear) Narco have produced the 360-channel Mk 7 trans- mitter/receiver, which covers the band from 118.0Mc/s to135.95Mc/s in 50kc/s steps. The panel-mounted portion, with its single frequency selector for single-channel simplex working,is designed to fit into a standard instrument cut-out so that it can replace or augment any existing installation. The separate powersupply weighs 61b. Although the FAA will continue until 1966 to provide traffic control service on lOOkc/s-spaced channelsbelow 126.9Mc/s, the more refined radio is already useful and will eventually become mandatory. The Mk 7 costs £427 ex-works.Third of the new radios, the Mk 10 combines in a single case a Mk 7 50kc/s communications radio with a 190-channel receivercovering the VOR/ILS bands and communications at lOOkc/s spacing up to 126.9Mc/s. A CS-3A converter and indicator adaptthe 190-channel receiver for VOR/ILS and make what Narco term a "H system." The panel-mounted portion of the Mk 10is 12in deep and has the same frontal area as the earlier Mk V and Mk VI. Together with its remote power supply, the Mk 10weighs 12.51b. Power output is stated to be 8W. The Mk 10 costs £605 ex-works. Narco are now also offering the UGR-1 glide-slope receiver asa remote-mounted unit to FAA technical standard order specifica- tions and with a tuning system compatible with the standard ILSlocalizer element. It weighs 6.751b and costs £248 ex-works. American business pilots often use ILS localizer and markerbeacon alone to make ILS approaches in fairly high minima, but Narco can now offer the UGR-1 to complete the equipment.Conversely, the UGR-1 glide-slope could be used for a precision approach in conjunction with ADF tuned to the locator beaconand a marker-beacon receiver. Toss-bombing for the Etendard IV THE French Government has ordered Saab BT9F toss-bombingcomputers for installation in the Etendard IVs being produced for the French Navy. The order was placed after competitiveevaluation and Saab state that negotiations for orders from other countries are proceeding.The BT9F incorporates an electronic analogue computer which automatically measures height, dive angle and airspeed to computethe point at which, during a pull-out from the initial dive, the weapon should be released. An additional device makes the BT9suitable for air-to-ground rocket-firing. Similar computations in conjunction with a fire-control radarallow the type of air-to-air attack illustrated at the head of this page. If the target is well above or beyond the ceiling of theintercepter, the radar data are presented on the scope to guide the pilot into a snap-up manoeuvre. At an appropriate signal the pilotarms the missiles and presses the firing button. After that the fire-control feeds the necessary parameters to the missile andlaunches it upwards. The intercepter pulls away over the top. Left, above, the new Narco UDI-2 DMET for business aircraft. The tuner/indicator is panel-mounted and the power unit remote. Below are the new Mk 7 360-channel, 50kc/s spacing transmitter/receiver and the Mk 10 combined 360-channel transmitter/receiver and 190- channel VOR/ILS and communications receiver
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