ICAO CIRCULAR 7-AN/6 CIRCULAR JULY 1948 ENGINEERING STUDY OF FACTORS AFFECTING THE CHOICE OF FREQUENCIES OF DME PubZiehed by authority 09 .the 8samtary QenaraS I CIVIL AVIATION ORGANIZATION MONTREAL CANADA
This Bubcation Is issued in bgli sh, French aad Spanish. Publf shed in lbntreal, Canada, by the International CZvil Aviation Ormization. Correspndence concerning the pubJ-Lcationa should be addressed to the Secretary General of IChO, Domidon Square Buimng, Montreal, Canada. Orders for ICAO publications should be sent, on papent In CanadSmn or U.S. currency 1, to In Sterling, or Irish currency s/dJ, Zlo Secretary General, ICAO, Ills 1.b jesty 's Stationery Office, Dominion Square Building, 429 Oxford Street, Montreal, Canada. fiondon W .I, Cable address ICAO FIO In French currency Be, to Xn Emtian currency hhs, to I ICAO RepresentaEive, ICAO Representative , Euro,pmn African Office, Middle East Office, 60 bis Avenue dtIdna, 10 Skfa Lotfallah, Aernent 7, Paris l6, fiance. Zcalek, cable address ICAOEZEP PARIS Cairo, Egypt. Cable address ICAOREP CAIRO 3h Peruvian currency soles, to ICAO Representative, ICAO Represen-fQ"c.ve, Soufih American Office, Far East Pacific Office, Apartado 680, 522 Little Collins Street, Lima, Pent. Melbourne, Atls tralia . ' Cable address IGAOREP LIM Cable addre s ICBORFrP MELBObRl . Price LO cents Canadfan or U .S. -currency Nontreal
ICAO Circular 7 . AN/ Page 3 TABLE OF CONTENTS Page FOREWORD OooaeeaeOe 5 ENGINEERING STUDY OF FACTORS AFFECTING THE CHOICE OF FREQUENCIES FOR DME 1 . General Consideration ............................ 7 2 . Technical Performance Capabilities ............... 8 3 . Operational Characteristics ...................... 10 ................... 4 . Availability of Frequency Band 13 5 . Availability and Cost of Equipment.. ........O.O.. 14 6 . General onclusions .....e.......O..e............e 16 Appendix A- Memorandum to the Executive Committee of the Radio Technical Commission for Aeronautics . Design Criteria for Distance Measuring System .... 17 Appendix Be- Distance Measuring System Standardizatin........ ....b.....9.0.. . 21 I Operational Requirements . ................... 21 I1 Additional use........................... 23 I11 Frequency Range ......O.o................... 23 IV Frequency Channels ..................O....... 23 V System characteristic............... 24 Appendix C.. 200 Mc/s. Proposal. ................O... 29
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