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Circular 20
Identification of LF/MF Non-Directional Radio Beacons Utilizing Frequency Modulation (F1)
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CIRCULAR 20-AN/ 17 CIRCULAR I SEPTEMBER 1951 IDENTIFICATION OF LF/MF NON-DIRECTIONAL RADIO BEACONS UTILIZING FREQUENCY MODULATION 5 Published by authority of the Secretary General INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA
This PubUlaatfon is issued fn English0 Freneh and Spanish Pablishgd h ntreaP, Canada, by the Inbrnationd Civil Ahtion Ogcmiaation Csmqondenee concerning pubPeations should be addressed tto the seemhry General of 1660, Inbrzmtioruil Avh.tfon Wlffdfng, IW rnmrsfty. Sree, bntma, Cdere Secretary General, ICAO, The Unfbd Kingdom Sheionesr Offfee, Internti OW Avatiom Wfdng, PeOe Box 9 Q80 Uxxtversfty Sme, Itondon, SoEo 1, Msntreal, Ganada. EngsUPld. cable addreg IGAO MONTREAL cable addfeagn TO WOBT ICAO Representative, South briean Offfee, ICAO RepmsenhtilTe, H5ddle s Offgee, 9
ICAO Circular 20-AN/17 3 The information contained in this circular concerns a proposed method of identifying LF'/Ma Elon-Directional Radio Beacons and LF/ Radio Broadcasting Stations by utilising frequency modulation F techniques for conveying the identity in such a manner that certain difficulties experienced with existing A1 and AA methods of identification are eliminated. The material was submitted to the Fourth Session of the Coications Division of ICAO bg the Government of France. The Division recommended tbat the material should be disseminated to States for their information and for the purpose of encouraging an operational evaluation of the proposed method 04 identification.
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Table Of Contents
COVER PAGE
FOREWORD
TABLE OF CONTENTS