Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3644

(371) NM (km) 3 000 (10 000) 6 000 (20 000) 9 000 (30 000) 12 000 (40 000) 15 000 (50 000) Metres (feet) Nominal O effective radiated po er re uired to provide 107 dB /m po er density, 90 microvolts per metre field strength, at various slant ranges/levels ith a typical antenna array located 4.9 m (16 ft) above ground evel above facility Slant range distance from O antenna 11 dB 17 dB 23 dB Figure C-13 ATT C-43 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 3.1.5 A VOR having an ERP of plus 23 dBW approximates to a VOR previously referred to in Annex 10 as Category A (transmitter power 200 W). Possible relationships between ERP and transmitter output powers are illustrated by the following examples: Example I Example II Transmitter power +23 dBW +18 dBW Ground transmission line loss –2 dB –1 dB Antenna gain relative to an isotropic antenna +2 dB +6 dB ERP +23 dBW +23 dBW Similarly, a VOR having an ERP of plus 17 dBW approximates to a VOR previously referred to in Annex 10 as Category B (transmitter power 50 W). Possible relationships between ERP and transmitter output powers are illustrated by the following examples: Example I Example II Transmitter power +17 dBW +10 dBW Ground transmission line loss –2 dB –1 dB Antenna gain relative to an isotropic antenna +2 dB +8 dB ERP +17 dBW +17 dBW 3.1.6 It is recognized that the above ERP categories may achieve a greater coverage than is necessary for some operational requirements. A suitable lesser coverage might be achieved by a VOR facility having an ERP of approximately plus 11 dBW as follows: Example I Example II Transmitter power +11 dBW +7 dBW Ground transmission line loss –2 dB –1 dB Antenna gain relative to an isotropic antenna +2 dB +5 dB ERP +11 dBW +11 dBW 3.2 Guidance in respect of siting of VOR 3.2.1 The site should be on the highest ground in the vicinity to obtain the greatest line-of-sight coverage and should be level or should slope away from the station (at a downgrade not exceeding 4 per cent) to a distance of at least 300 m (1 000 ft) and preferably to 600 m (2 000 ft) from the station. The site contours should be circular with respect to the antenna array to a radius of at least 300 m (1 000 ft). The site should be as far removed from wire lines and fences as possible. The height of wire lines and fences should not subtend a vertical angle of more than 1.5 degrees or extend more than 0.5 degree above the horizontal as measured from the antenna array. These limits may be increased by 50 per cent for fences or lines which are essentially radial to the antenna array or which subtend a horizontal angle of no more than 10 degrees. Single trees of moderate size, up to 9 m (30 ft) in height, may be tolerated beyond 150 m (500 ft). No groups of trees should subtend a 23/11/06 ATT C-44 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications vertical angle greater than 2 degrees or be situated within 300 m (1 000 ft) of the station. Provisions should be made for clearing trees to 600 m (2 000 ft) if it should prove necessary. No structures should subtend a vertical angle greater than 1.2 degrees or be situated within 150 m (500 ft) of the station. Wooden structures with negligible metallic content and with little prospect of future metallic additions may subtend vertical angles up to 2.5 degrees. 3.2.2 In mountainous terrain, a mountain-top site will often be preferable. The site should be on the highest accessible hilltop or mountain, the top of which should be graded flat to a radius of at least 45 m (150 ft). On such sites, the antenna system should be installed approximately a half wavelength above ground level in the centre of the graded area and the transmitter building should be beyond the graded area, far enough down the slope to be below optical line of sight from the antenna array. No ground, trees, power lines, buildings, etc. between 45 m (150 ft) and 360 m (1 200 ft) should be within optical line of sight of the antenna array. 3.3 Determination of the effect of “polarization error” on VOR accuracy 3.3.1 As it is not possible to specify as yet the maximum permissible value of the vertically polarized component of the radiation from the VOR, certain flight tests are necessary to determine the effect on the bearing indication accuracy due to the presence of the “polarization errors”. 3.3.2 Three methods are available to determine the effects of “polarization errors”:

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