Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2178

e) Transmitted tones. Tone codes should be made up of various combinations of the tones listed in the following table and designated by colour and letter as indicated: Designation Frequency (Hz) Red A 312.6 Red B 346.7 Red C 384.6 Red D 426.6 Red E 473.2 Red F 524.8 Red G 582.1 Red H 645.7 Red J 716.1 Red K 794.3 Red L 881.0 Red M 977.2 Red P 1 083.9 Red Q 1 202.3 Red R 1 333.5 Red S 1 479.1 Note 1.— It should be noted that the tones are spaced by Log–1 0.045 to avoid the possibility of harmonic combinations. Note 2.— In accordance with the application principles developed by the Sixth Session of the Communications Division, the only codes at present used internationally are selected from the red group. Note 3.— Guidance material on the use of SELCAL systems is contained in the Attachment to Part II. Note 4.— The tones Red P, Red Q, Red R, and Red S are applicable after 1 September 1985, in accordance with 3.2. Annex 10 — Aeronautical Communications Volume III 22/11/07 II-3-2 3.2 As from 1 September 1985, aeronautical stations which are required to communicate with SELCAL-equipped aircraft shall have SELCAL encoders in accordance with the red group in the table of tone frequencies of 3.1. After 1 September 1985, SELCAL codes using the tones Red P, Red Q, Red R, and Red S may be assigned. ___________________ ANNEX 10 — VOLUME III II-4-1 22/11/07 CHAPTER 4. AERONAUTICAL SPEECH CIRCUITS 4.1 TECHNICAL PROVISIONS RELATING TO INTERNATIONAL AERONAUTICAL SPEECH CIRCUIT SWITCHING AND SIGNALLING FOR GROUND-GROUND APPLICATIONS Note.— Guidance material on the implementation of aeronautical speech circuit switching and signalling for groundground applications is contained in the Manual on Air Traffic Services (ATS) Ground-Ground Voice Switching and Signalling (Doc 9804). The material includes explanation of terms, performance parameters, guidance on basic call types and additional functions, references to appropriate ISO/IEC international standards and ITU-T recommendations, guidance on the use of signalling systems, details of the recommended numbering scheme and guidance on migration to future schemes. 4.1.1 The use of circuit switching and signalling to provide speech circuits to interconnect ATS units not interconnected by dedicated circuits shall be by agreement between the Administrations concerned. 4.1.2 The application of aeronautical speech circuit switching and signalling shall be made on the basis of regional air navigation agreements. 4.1.3 Recommendation.— The ATC communication requirements defined in Annex 11, Section 6.2 should be met by implementation of one or more of the following basic three call types:

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