Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3045

b) for Category III localizers: 10 degrees, of phase relative to 90 Hz. Similarly, the 150 Hz tones of the two carriers shall be phase-locked so that the demodulated wave forms pass through zero in the same direction within: 1) for Categories I and II localizers: 20 degrees; and 2) for Category III localizers: 10 degrees, of phase relative to 150 Hz. 3.1.3.5.3.5 Alternative two-frequency localizer systems that employ audio phasing different from the normal in-phase conditions described in 3.1.3.5.3.4 shall be permitted. In this alternative system, the 90 Hz to 90 Hz phasing and the 150 Hz to 150 Hz phasing shall be adjusted to their nominal values to within limits equivalent to those stated in 3.1.3.5.3.4. Note This is to ensure correct airborne receiver operation in the region away from the course line where the two carrier signal strengths are approximately e ual 3.1.3.5.3.6 Recommendation The sum of the modulation depths of the radio fre uency carrier due to the and tones should not exceed per cent or be less than per cent within the re uired coverage 3.1.3.5.3.6.1 For equipment first installed after 1 January 2000, the sum of the modulation depths of the radio frequency carrier due to the 90 Hz and 150 Hz tones shall not exceed 60 per cent or be less than 30 per cent within the required coverage. Note If the sum of the modulation depths is greater than per cent for Facility Performance Category I locali ers the nominal displacement sensitivity may be adjusted as provided for in to achieve the above modulation limit 2007/70/II. szám C a ter Annex 10 — Aeronautical Communications 23/11/06 Note For two fre uency systems the standard for maximum sum of modulation depths does not apply at or near a imuths where the course and clearance carrier signal levels are e ual in amplitude (i e at a imuths where both transmitting systems have a significant contribution to the total modulation depth) Note The standard for minimum sum of modulation depths is based on the malfunctioning alarm level being set as high as per cent as stated in of Attachment C 3.1.3.5.3.7 When utilizing a localizer for radiotelephone communications, the sum of the modulation depths of the radio frequency carrier due to the 90 Hz and 150 Hz tones shall not exceed 65 per cent within 10 degrees of the course line and shall not exceed 78 per cent at any other point around the localizer. 3.1.3.5.4 Recommendation Undesired fre uency and phase modulation on I S locali er radio fre uency carriers that can affect the displayed DDM values in locali er receivers should be minimi ed to the extent practical Note Relevant guidance material is given in of Attachment C 3.1.3.6 Course alignment accuracy 3.1.3.6.1 The mean course line shall be adjusted and maintained within limits equivalent to the following displacements from the runway centre line at the ILS reference datum:

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