Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2240

b) at a level lower than 9 dB below the radiated amplitude of P1, within the desired arc of interrogation. 3.1.1.5.2 Within the desired beam width of the directional interrogation (main lobe), the radiated amplitude of P3 shall be within 1 dB of the radiated amplitude of P1. Chapter 3 Annex 10 — Aeronautical Telecommunications 3-3 22/11/07 3.1.1.6 REPLY TRANSMISSION CHARACTERISTICS (SIGNALS-IN-SPACE) 3.1.1.6.1 Framing pulses. The reply function shall employ a signal comprising two framing pulses spaced 20.3 microseconds as the most elementary code. 3.1.1.6.2 Information pulses. Information pulses shall be spaced in increments of 1.45 microseconds from the first framing pulse. The designation and position of these information pulses shall be as follows: Pulses Position (microseconds) C1 1.45 A1 2.90 C2 4.35 A2 5.80 C4 7.25 A4 8.70 X 10.15 B1 11.60 D1 13.05 B2 14.50 D2 15.95 B4 17.40 D4 18.85 Note.— The Standard relating to the use of these pulses is given in 2.1.4.1. However, the position of the “X” pulse is specified only as a technical standard to safeguard possible future use. 3.1.1.6.3 Special position identification pulse (SPI). In addition to the information pulses provided, a special position identification pulse shall be transmitted but only as a result of manual (pilot) selection. When transmitted, it shall be spaced at an interval of 4.35 microseconds following the last framing pulse of Mode A replies only. 3.1.1.6.4 Reply pulse shape. All reply pulses shall have a pulse duration of 0.45 plus or minus 0.1 microsecond, a pulse rise time between 0.05 and 0.1 microsecond and a pulse decay time between 0.05 and 0.2 microsecond. The pulse amplitude variation of one pulse with respect to any other pulse in a reply train shall not exceed 1 dB. Note.— The intent of the lower limit of rise and decay times (0.05 microsecond) is to reduce sideband radiation. Equipment will meet this requirement if the sideband radiation is not greater than that which, theoretically, would be produced by a trapezoidal wave having the stated rise and decay times. 3.1.1.6.5 Reply pulse position tolerances. The pulse spacing tolerance for each pulse (including the last framing pulse) with respect to the first framing pulse of the reply group shall be plus or minus 0.10 microsecond. The pulse interval tolerance of the special position identification pulse with respect to the last framing pulse of the reply group shall be plus or minus 0.10 microsecond. The pulse spacing tolerance of any pulse in the reply group with respect to any other pulse (except the first framing pulse) shall not exceed plus or minus 0.15 microsecond. 3.1.1.6.6 Code nomenclature. The code designation shall consist of digits between 0 and 7 inclusive, and shall consist of the sum of the subscripts of the pulse numbers given in 3.1.1.6.2 above, employed as follows: Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 3-4 Digit Pulse Group First (most significant) A Second B Third C Fourth D 3.1.1.7 TECHNICAL CHARACTERISTICS OF TRANSPONDERS WITH MODE A AND MODE C CAPABILITIES ONLY 3.1.1.7.1 Reply. The transponder shall reply (not less than 90 per cent triggering) when all of the following conditions have been met:

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