Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3718

d) the appropriate pulse repetition frequency as given in Chapter 3, 3.5.3.4. 7.1.5.2 Given the interrogation loading which results from the peak traffic as well as the reply efficiency of the transponder in the presence of this load, the resulting reply rate can be computed, thereby establishing the required transmitter capability. This reply rate is the level that, when exceeded, results in a reduction in receiver sensitivity (as specified in Chapter 3, 3.5.4.2.4) in order to maintain the reply rate at or below this maximum level. 7.1.6 Siting of ME associated with ILS or MLS 7.1.6.1 The DME should, where possible, provide to the pilot an indicated zero range at touchdown in order to satisfy current operational requirements. 7.1.6.2 The optimum site for a DME transponder is dependent upon a number of technical and operational factors. DME/N may be installed with ILS or MLS where operational requirements permit. DME/P, which provides higher accuracy and coverage throughout the entire runway region, is required to support the more flexible and advanced operations that are available with MLS. 7.1.6.3 In the case of DME/N, the provision of zero range indication may be achieved by siting the transponder as close as possible to the point at which zero range indication is required. Alternatively, the transponder time delay can be adjusted to permit aircraft interrogators to indicate zero range at a specified distance from the DME antenna. When the indicated DME zero range has a reference other than the DME antenna, consideration should be given to publishing this information. 7.1.6.4 In the case of DME/P, in order to meet accuracyand coverage requirements, particularly in the runway region, it is recommended that the DME/P be sited as closely as possible to the MLS azimuth facility, consistent with obstacle clearance criteria. For aircraft equipped with a fullMLS capability, the desired zero range indication can thenbe obtained by utilizing MLS basic data. Note that the DME/P transponder time delay must not be adjusted for this purpose. 7.1.6.5 It is desirable that all users obtain indicated zero range at touchdown irrespective of the airborne equipment fitted. This would necessitate location of the DME/P abeam the runway at the touchdown point. In this case accuracy requirements for DME/P would not be met on the runway. It must be noted that MLS Basic Data Word 3 only permits the coding of DME/P coordinates within certain limits. 7.1.6.6 If an MLS/DME/P and an ILS/DME/N serve the same runway, an aircraft equipped with a minimum MLS capability can have a zero range indication at the MLS approach azimuth site when operating on MLS and a zero range indication at the touchdown point when operating on ILS. As this is considered to be operationally unacceptable, specifically from an ATC point of view, and if ILS/MLS/DME frequency tripling to prevent the relocation of the DME/N is not possible, the implementation of DME/P is to be postponed until the DME/N is withdrawn. 7.1.6.7 The nominal location of the zero range indication provided by a DME/N interrogator needs to be published. 7.1.6.8 In considering DME sites, it is also necessary to take into account technical factors such as runway length, profile, local terrain and transponder antenna height to assure adequate signal levels in the vicinity of threshold and along the runway. Care is also to be taken that where distance information is required in the runway region, the selected site is not likely to cause the interrogator to lose track due to excessive rate of change of velocity. 23/11/06 ATT C-70 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications 7.1.7 Geographical separation criteria In order to allow consideration of actual antennadesigns, equipment characteristics, and service volumes, the signal ratios needed to assure interference-free operation of the various facilities operating on DME channels are provided in 7.1.8, 7.1.9 and 7.1.10. Given these ratios, the geographical separations of facilities may be readilyevaluated by accounting for power losses over the propagation paths. 7.1.8 esired to undesired ( / ) signal ratios at the airborne receiver 7.1.8.1 Table C-4 indicates the necessary D/U signal ratios needed to protect the desired transponder reply signal at an airborne receiver from the various co-frequency/adjacent frequency, same code/different code, undesired transponder reply signal combinations that may exist. For initial assignments, the D/U ratios necessary to protect airborne equipment with 6-microsecond decoder rejection should be used. In making an assignment, each facility must be treated as the desired source with the other acting as the undesired. If both satisfy their unique D/U requirement, then the channel assignment may be made. Table C-4. Protection ratio D/U (dB) Type of assignment A B Co-frequency: Same pulse code Different pulse code –42 First adjacent frequency: Same pulse code Different pulse code –(Pu – 1) –(Pu + 7) –42 –75 Second adjacent frequency: Same pulse code Different pulse code –(Pu + 19) –(Pu + 27) –75 –75 Note 1.— The / ratios in column A protect those ME/N interrogators operating on or channels. Column A applies to decoder re ection of 6 microseconds. Note 2.— The / ratios in column B protect those ME/N or ME/P interrogators utilizing discrimination in conformance with 3.5.5.3.4.2 and 3.5.5.3.4.3 of Chapter 3 and providing a decoder re ection conforming to 3.5.5.3.5 of Chapter 3. Note 3.— Pu is the peak effective radiated power of the undesired signal in dB . Note 4.— The frequency protection requirement is dependent upon the antenna patterns of the desired and undesired facility and the ERP of the undesired facility. Note 5.— In assessing ad acent channel protection, the magnitude of / ratio in column A should not exceed the magnitude of the value in column B. ATT C-71 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 7.1.8.2 Accordingly, DME channel assignments depend upon the following:

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