SOLID_STATE_MARKER_BEACON_RECEIVER

Published:2009/7/16 4:43:00 Author:Jessie | From:SeekIC

Three colored lamps glow in sequence during instrument landing system approach as 75-Mc receiver passes over three marker beacons modulated at 400, 1,300, and 3,900 cps respectively. Four-pole Butterworth filter ahead of first stage suppresses spurious response to 77.25-Mc carrier of television chanel 5. Single r-f stage isolates separate 68.75-Mc crystal controlled oscillator from antenna. Agc accomodates signals from 300 microvolts to 50 mv. -J. G. Robertson, Light-Airplane Marker-Beacon Receiver, Electronics,37:3, p 33-35.



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