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prewar rad1o nav1gat1onal
SHORTRANGE NAVIGATIONAL AIDSRADAR
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accuracy accurate achieved Adcock aerial aerial system airborne equipment airfield applied azimuth B.A.B.S. system base-line beacon systems beam Bomber Command c.w. systems calibration pips cathode-ray tube Chapter circuits civil aviation Coastal Command Consol course d.c. pulse d.f. loop dashes delay developed dipole display distance dots errors Eureka Eureka beacons fixed flying frequency frequency-modulation give glide path ground beacon ground stations ground waves hyperbolae indication Instn Elect instrument landing instrument landing system interrogator ionospheric large number limited Loran m.f. band Mc./sec measurement meter microwave radar miles modulation multivibrator navigational system night normally number of aircraft obtained omni-directional operation oscillator pair phase polar diagram power output produced R. A. Smith radar beacons radar equipment radar map radiators radio altimeter Radio Ranges Rebecca responder beacon shown in fig signals sky waves switch take bearings target Telecommunications Research Establishment time-base track guides transmission transmitter trigger v.h.f. band wave-length