Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3102

b) cause radiation to cease. Note uidance material on R appears in Section of Attachment C 3.3.8 Interference immunity performance for VOR receiving systems 3.3.8.1 After 1 January 1998, the VOR receiving system shall provide adequate immunity to interference from two signal, third-order intermodulation products caused by VHF FM broadcast signals having levels in accordance with the following: 2N1 N2 72  0 for VHF FM sound broadcasting signals in the range 107.7 108.0 MHz and 3 24 20 log 0.4 f N N ' § ·    d ¨ ¸ © ¹ for VHF FM sound broadcasting signals below 107.7 MHz, where the frequencies of the two VHF FM sound broadcasting signals produce, within the receiver, a two-signal, third-order intermodulation product on the desired VOR frequency. N1 and N2 are the levels (dBm) of the two VHF FM sound broadcasting signals at the VOR receiver input. Neither level shall exceed the desensitization criteria set forth in 3.3.8.2. ǻf 108.1 f1, where f1 is the frequency of N1, the VHF FM sound broadcasting signal closer to 108.1 MHz. 3.3.8.2 After 1 January 1998, the VOR receiving system shall not be desensitized in the presence of VHF FM broadcast signals having levels in accordance with the following table: Maximum level of Fre uency unwanted signal at (M ) receiver input (d m) 88-102 107.9 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 23/11/06 3 32 Note The relationship is linear between adjacent points designated by the above fre uencies Note uidance material on immunity criteria to be used for the performance uoted in and is contained in Attachment C 3.3.8.3 After 1 January 1995, all new installations of airborne VOR receiving systems shall meet the provisions of 3.3.8.1 and 3.3.8.2. 3.3.8.4 Recommendation Airborne R receiving systems meeting the immunity performance standards of and should be placed into operation at the earliest possible date 3 Specification for non directional radio beacon D 3.4.1 Definitions Note In Attachment C guidance is given on the meaning and application of rated coverage and effective coverage and on coverage of ND s Avera e radius o rated covera e The radius of a circle having the same area as the rated coverage. ective covera e The area surrounding an NDB within which bearings can be obtained with an accuracy sufficient for the nature of the operation concerned. ocator An LF/MF NDB used as an aid to final approach. Note A locator usually has an average radius of rated coverage of between and m ( and NM) ated covera e The area surrounding an NDB within which the strength of the vertical field of the ground wave exceeds the minimum value specified for the geographical area in which the radio beacon is situated. Note The above definition is intended to establish a method of rating radio beacons on the normal coverage to be expected in the absence of s y wave transmission and or anomalous propagation from the radio beacon concerned or interference from other F MF facilities but ta ing into account the atmospheric noise in the geographical area concerned 3.4.2 Coverage 3.4.2.1 Recommendation The minimum value of field strength in the rated coverage of an ND should be microvolts per metre Note uidance on the field strengths re uired particularly in the latitudes between N and S is given in of Attachment C and the relevant ITU provisions are given in Chapter III Article Section I Part of the Radio Regulations Note The selection of locations and times at which the field strength is measured is important in order to avoid abnormal results for the locality concerned locations on air routes in the area around the beacon are operationally most significant 2007/70/II. szám C a ter Annex 10 — Aeronautical Communications 3 33 23/11/06 3.4.2.2 All notifications or promulgations of NDBs shall be based upon the average radius of the rated coverage. Note In classifying radio beacons in areas where substantial variations in rated coverage may occur diurnally and seasonally such variations should be ta en into account Note eacons having an average radius of rated coverage of between and m ( and NM) may be designated by the nearest multiple of m ( NM) to the average radius of rated coverage and beacons of rated coverage over m ( NM) to the nearest multiple of m ( NM) 3.4.2.3 Recommendation here the rated coverage of an ND is materially different in various operationally significant sectors its classification should be expressed in terms of the average radius of rated coverage and the angular limits of each sector as follows Radius of coverage of sector angular limits of sector expressed as magnetic bearing cloc wise from the beacon here it is desirable to classify an ND in such a manner the number of sectors should be ept to a minimum and preferably should not exceed two Note The average radius of a given sector of the rated coverage is e ual to the radius of the corresponding circle sector of the same area Example 3.4.3 Limitations in radiated power The power radiated from an NDB shall not exceed by more than 2 dB that necessary to achieve its agreed rated coverage, except that this power may be increased if coordinated regionally or if no harmful interference to other facilities will result. 3.4.4 Radio frequencies 3.4.4.1 The radio frequencies assigned to NDBs shall be selected from those available in that portion of the spectrum between 190 kHz and 1 750 kHz. 3.4.4.2 The frequency tolerance applicable to NDBs shall be 0.01 per cent except that, for NDBs of antenna power above 200 W using frequencies of 1 606.5 kHz and above, the tolerance shall be 0.005 per cent. 3.4.4.3 Recommendation here two locators are used as supplements to an I S the fre uency separation between the carriers of the two should be not less than to ensure correct operation of the radio compass and preferably not more than in order to permit a uic tuning shift in cases where an aircraft has only one radio compass 3.4.4.4 Where locators associated with ILS facilities serving opposite ends of a single runway are assigned a common frequency, provision shall be made to ensure that the facility not in operational use cannot radiate. Note Additional guidance on the operation of locator beacons on common fre uency channels is contained in olume Chapter 3.4.5 Identification 3.4.5.1 Each NDB shall be individually identified by a two- or three-letter International Morse Code group transmitted at a rate corresponding to approximately 7 words per minute. 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 23/11/06 3 3 3.4.5.2 The complete identification shall be transmitted at least once every 30 seconds, except where the beacon identification is effected by on/off keying of the carrier. In this latter case, the identification shall be at approximately 1-minute intervals, except that a shorter interval may be used at particular NDB stations where this is found to be operationally desirable. 3.4.5.2.1 Recommendation Except for those cases where the beacon identification is effected by on off eying of the carrier the identification signal should be transmitted at least three times each seconds spaced e ually within that time period 3.4.5.3 For NDBs with an average radius of rated coverage of 92.7 km (50 NM) or less that are primarily approach and holding aids in the vicinity of an aerodrome, the identification shall be transmitted at least three times each 30 seconds, spaced equally within that time period. 3.4.5.4 The frequency of the modulating tone used for identification shall be 1 020 Hz plus or minus 50 Hz or 400 Hz plus or minus 25 Hz. Note Determination of the figure to be used would be made regionally in the light of the considerations contained in Attachment C 3.4.6 Characteristics of emissions Note The following specifications are not intended to preclude employment of modulations or types of modulations that may be utili ed in ND s in addition to those specified for identification including simultaneous identification and voice modulation provided that these additional modulations do not materially affect the operational performance of the ND s in conjunction with currently used airborne direction finders and provided their use does not cause harmful interference to other ND services 3.4.6.1 Except as provided in 3.4.6.1.1, all NDBs shall radiate an uninterrupted carrier and be identified by on/off keying of an amplitude modulating tone (NON/A2A). 3.4.6.1.1 NDBs other than those wholly or partly serving as holding, approach and landing aids, or those having an average radius of rated coverage of less than 92.7 km (50 NM), may be identified by on/off keying of the unmodulated carrier (NON/A1A) if they are in areas of high beacon density and/or where the required rated coverage is not practicable of achievement because of:

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