Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3643

3. Material concerning VOR 3.1 Guidance relating to VOR effective radiated power (ERP) and coverage 3.1.1 The field strength specified at Chapter 3, 3.3.4.2, is based on the following consideration: Airborne receiver sensitivity –117 dBW Transmission line loss, mismatch loss, antenna polar pattern variation with respect to an isotropic antenna +7 dBW Power required at antenna –110 dBW The power required of minus 100 dBW is obtained at 118MHz with a power density of minus 107 dBW/m2; minus 107 dBW/m2 is equivalent to 90 microvolts per metre, i.e. plus 39 dB referenced to 1 microvolt per metre. Note.— The power density for the case of an isotropic antenna may be computed in the following manner 10 log 4 d a P P O  S where Pd power density in dB /m2 Pa power at receiving point in dB Ȝ wavelength in metres. 3.1.2 Nominal values of the necessary ERP to achieve a field strength of 90 microvolts per metre (minus 107 dBW/m2) are given at Figure C-13. For coverage under difficult terrain and siting conditions, it may be necessary to make appropriate increases in the effective radiated power. Conversely, practical experience has shown that under favourable siting conditions, and under the less pessimistic conditions often found in actual service, satisfactory system operation is achieved with a lower ERP. Note.— The nominal effective radiated powers, expressed as a function of level and range, are based upon consideration of basic theoretical data from various sources (such as IT -R and NBS) modified empirically to reflect typical operational experience. 3.1.3 The use of Figure C-13 is illustrated by the following examples. In order to achieve the necessary field strength at 342 km (185 NM)/12 000 m (40 000 ft), 300 km (162 NM)/12 000 m (40 000 ft), and 166.5 km (90 NM)/6 000 m (20 000 ft), nominal effective radiated powers of plus 23 dBW, plus 17 dBW and plus 11 dBW respectively are required. 3.1.4 In order to facilitate frequency and equipment planning, wherever practicable, ERP categories corresponding to plus 23 dBW, plus 17 dBW and plus 11 dBW should be employed. These ERP values should be indicated during regional planning activities. 23/11/06 ATT C-42 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications

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