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Aviation History
1949
1949 - 0728.PDF
April 28th, 1949 FLIGHT 483 AIR RADIO Modern Civil-Aviation Aids Reviewed By Dr. B. O'Kane and M. I. FoTsyth-Grant THE growth in the volume of air traffic and the higherspeeds of present-day aircraft have increased thedemand for radio control and navigational facilities far beyond that of a decade ago. Many of the navigational aids are a legacy of wartime operations and will eventually be replaced by post-war designs, while on the control side the introduction of V.H.F. for short-range R/T. has, per- haps, been the major step in improving communications. For reasons of space this article does not attempt to give a complete survey of all systems and equipments, but the most interesting aspects have been covered. For conveni- ence, ground and aircraft equipment have been treated separately. Ground Equipment Radio equipment for use on the ground may be divided in the following categories: — (1) Airfield and approach control (tower). - '-'J (2) Area control and point-to-point communication. (3) Navigational aids. The facilities provided at airports vary considerably, a fact which can conveniently be illustrated by the following lists of those available at London Airport and of a number of small installations provided by International Aeradio, Ltd., for airfields in Burma:•— LONDON AIRPORT Frequencies Service Trans. Rec. kc/s kc/s M.F. D/F bearings and aeronautical communications „ 350.5 34** H.F. D/F bearings and aeronautical communications 3285 3285 Meteorological broadcast service ..,.. 279 .-• •••.'.'•-.• .• '.•> -•- •» ' •" 396i 8515 H.F. R/T. airfield control "..- 2834 2834 5100 5100 V.H.F. R/T. airfield control and univer- sal guard 118100 118100 V.H.F. R/T approach control rigioo 119100 V.H.F. D/F 119100 119100 S.C.S.51 main beacon 109100 (Channel W) S.C.S.51 glide path ... 335000 S.C.S.51 boundary marker 75000 S.C.S.51 middle marker . — 75000 rJ~'HIS article is especially noteworthy in that, in a 1 comparatively limited space, it succeeds in surveying almost the entire field of modern aircraft radio and radar communications and navigational aids—a specialized subject of the greatest complexity. We commend this review not only to airline operators and others intimately concerned who wish to keep their knowledge up to date, but also—for it is not ultra-technical —to the layman who is so often puzzled by the profusion of initials and code-names inseparable from the subject. LONDON AD3PORT (contd.) Frequencies Service Trans. Rec. kc/s kc/s S.C.S.51 onter marker 75000 Babs Mk. II beacon 214000 219000 Responder beacon 224000 229000 S.B.A. main beacon 34800 S.B.A. inner marker 38000 S.B.A. outer marker 38000 M.F. non-directional beacon 388 G.C.A. radar search system G.C.A. radar precision-landing system V.H.F. R/T. G.C.A. control 118100 118100 119100 119100 119700 119700 122100 r22roo •- •• •••'-.-• • 126180 126180 H.F. R/T. G.C.A. control ... .• 6440 6440 5100 5100 This list, which has been extracted from a Notice to Airmen, covers only facilities available to aircraft. In addition, there are (for example) all the internal communi- cations and the teleprinter network. MINOR AIRFIELDS, BURMA V.H.F. R/T. airfield control and universal guard .-• 118.1 mc/sV.H.F. R/T. approach control and V.H.F. D/F • "9-7 mc/sH.F. R/T. airfield control 6557kc/s H.F. point-to-point (1 of 5 pre-set frequencies in the band) 2-8 mc/s There will inevitably be some overlap from one category (Mow) Typical low-powered fixed-station equipment .'CS* rY>H,F, fni"««n'fftrf'^* <M>r* (**ht) Transmitter Type DU1 Telephones and CaWet, tiding two channels of V.H.F. radio-
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