Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 5000

f) interference protection required at the edge of the rated coverage. Of the foregoing factors, that which is most susceptible to improvement of a technical kind is c). 2. The 1979 World Administrative Radio Conference adopted regulations concerning the assignment of frequencies for aeronautical radio beacons operating in the LF/MF frequency bands. A minimum protection ratio (wanted/ unwanted signal ratio) of 15 dB is to be used as the basis for frequency assignment planning (RR Appendix S12). The following data concerning the attenuation characteristics of ADF equipment was used in the EUR region to aid in the frequency assignment process: The above figures (or distance separation criteria derived from them) have also been applied in other regions in determining the minimum protection ratio. Where a bearing accuracy of ±5 degrees is required at the edge of cover, a minimum protection of 15 dB by day should be used as the basis for LF/MF channel assignment planning. 3. In view of the fact that in many regions there is a need to improve the planning criteria it is considered that the main source from which improvement can be derived is recognition of higher attenuation figures than those given above. Regional meetings are accordingly advised that, when the congestion is such that the use of the above figures no longer permits efficient planning of the LF/MF frequency spectrum available, the following figures represent from a technical point of view the best that can be accepted in determining distance separation criteria: When using these figures, it should be noted that the RF selectivity of modern ADF equipment is in general better Frequency difference (kHz) Attenuation (dB) 2.4 3.6 4.3 Frequency difference (kHz) Attenuation (dB) Corr. 29/1/02 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume V 1/11/01 ATT B-2 than these figures and that, while the RF selectivity of older ADF equipment is not better than these figures, consideration of the dynamic characteristic of this older equipment shows this to be better. It could therefore be expected that frequency planning based on the new figures would considerably improve the service provided to users of modern equipment, and would not materially reduce the service presently provided to those aircraft using the older equipment. Nevertheless, in their planning, regional meetings would need to consider this question most carefully. 4. It is further noted that, in certain regions, many NDBs are used with voice channels and that this usage is aligned with the Note at the head of Volume I, 3.4.6. It is expected that regional meetings will take this fact into account when establishing criteria for frequency planning. 2007/70/II. szám ANNEX 10 — VOLUME V ATT C-1 1/11/01 ATTACHMENT C. GUIDING PRINCIPLES FOR LONG DISTANCE OPERATIONAL CONTROL COMMUNICATIONS Note.— The numerical sequence of the clauses below does not signify any order of relative importance. 1. Aeronautical Operational Control (AOC) HF Stations should be authorized where no other means for the exercise of long distance operational control are available or where the use of the normal communication services provided for safety and regularity of flights are unsuitable or inadequate. 2. The total number of ground stations on the worldwide radio channels should be kept to a minimum consistent with economic and operational efficiency. Consequently,

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