Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3165

e) calls for a practically attainable spectrum it is desirable to strive for the following spectrum control characteristics the spectrum of the pulse modulated signal is such that the power contained in a M band centred on fre uencies M above and M below the nominal channel fre uency is in each case at least d below the power contained in a M band centred on the nominal channel fre uency The power contained in a M band centred on fre uencies M above and M below the nominal channel fre uency is in each case at least d below the power contained in a M band centred on the nominal channel fre uency Any additional lobe of the spectrum is of less amplitude than the adjacent lobe nearer the nominal channel fre uency 3.5.5.1.4 Pulse spacing 3.5.5.1.4.1 The spacing of the constituent pulses of transmitted pulse pairs shall be as given in the table in 3.5.4.4.1. 3.5.5.1.4.2 DME N The tolerance on the pulse spacing shall be plus or minus 0.5 microsecond. 3.5.5.1.4.3 DME N Recommendation The tolerance on the pulse spacing should be plus or minus micro second 3.5.5.1.4.4 DME P The tolerance on the pulse spacing shall be plus or minus 0.25 microsecond. 3.5.5.1.4.5 The pulse spacing shall be measured between the half voltage points on the leading edges of the pulses. 3.5.5.1.5 Pulse repetition fre uency 3.5.5.1.5.1 The pulse repetition frequency shall be as specified in 3.5.3.4. 3.5.5.1.5.2 The variation in time between successive pairs of interrogation pulses shall be sufficient to prevent false lock-on. 3.5.5.1.5.3 DME P In order to achieve the system accuracy specified in 3.5.3.1.3.4, the variation in time between successive pairs of interrogation pulses shall be sufficiently random to decorrelate high frequency multipath errors. Note uidance on DME P multipath effects is given in Attachment C 3.5.5.1.6 Spurious radiation During intervals between transmission of individual pulses, the spurious pulse power received and measured in a receiver having the same characteristics of a DME transponder receiver, but tuned to any DME interrogation or reply frequency, shall be more than 50 dB below the peak pulse power received and measured in the same receiver tuned to the interrogation frequency in use during the transmission of the required pulses. This provision shall apply to all spurious pulse transmissions. The spurious CW power radiated from the interrogator on any DME interrogation or reply frequency shall not exceed 20 microwatts (minus 47 dBW). Note Although spurious C radiation between pulses is limited to levels not exceeding minus d States are cautioned that where DME interrogators and secondary surveillance radar transponders are employed in the same aircraft it may be necessary to provide protection to airborne SSR in the band M to M This protection may be provided by limiting conducted and radiated C to a level of the order of minus d here this level cannot be achieved the re uired degree of protection may be provided in planning the relative location of the SSR and DME aircraft antennas It is to be noted that only a few of these fre uencies are utili ed in the F DME pairing plan 3.5.5.1.7 Recommendation The spurious pulse power received and measured under the conditions stated in should be d below the re uired pea pulse power received 2007/70/II. szám C a ter Annex 10 — Aeronautical Communications 23/11/06 Note Reference and although limitation of spurious C radiation between pulses to levels not exceeding d below the pea pulse power received is recommended States are cautioned that where users employ airborne secondary surveillance radar transponders in the same aircraft it may be necessary to limit direct and radiated C to not more than microwatt in the fre uency band M to M It is to be noted that only a few of these fre uencies are utili ed in the F DME pairing plan 3.5.5.1.8 DME P The peak effective radiated power (ERP) shall not be less than that required to ensure the power densities in 3.5.4.2.3.1 under all operational weather conditions. 3.5.5.2 Time delay 3.5.5.2.1 The time delay shall be consistent with the table in 3.5.4.4.1. 3.5.5.2.2 DME N The time delay shall be the interval between the time of the half voltage point on the leading edge of the second constituent interrogation pulse and the time at which the distance circuits reach the condition corresponding to zero distance indication. 3.5.5.2.3 DME N The time delay shall be the interval between the time of the half voltage point on the leading edge of the first constituent interrogation pulse and the time at which the distance circuits reach the condition corresponding to zero distance indication. 3.5.5.2.4 DME P IA mode The time delay shall be the interval between the time of the half voltage point on the leading edge of the first constituent interrogation pulse and the time at which the distance circuits reach the condition corresponding to zero distance indication. 3.5.5.2.5 DME P FA mode The time delay shall be the interval between the virtual origin of the leading edge of the first constituent interrogation pulse and the time at which the distance circuits reach the condition corresponding to zero distance indication. The time of arrival shall be measured within the partial rise time of the pulse. 3.5.5.3 Receiver 3.5.5.3.1 Fre uency of operation The receiver centre frequency shall be the transponder frequency appropriate to the assigned DME operating channel (see 3.5.3.3.3). 3.5.5.3.2 Receiver sensitivity 3.5.5.3.2.1 DME N The airborne equipment sensitivity shall be sufficient to acquire and provide distance information to the accuracy specified in 3.5.5.4 for the signal power density specified in 3.5.4.1.5.2. Note Although the Standard in is for DME N interrogators the receiver sensitivity is better than that necessary in order to operate with the power density of DME N transponders given in in order to assure interoperability with the IA mode of DME P transponders 3.5.5.3.2.2 DME P The airborne equipment sensitivity shall be sufficient to acquire and provide distance information to the accuracy specified in 3.5.5.4.2 and 3.5.5.4.3 for the signal power densities specified in 3.5.4.1.5.3. 3.5.5.3.2.3 DME N The performance of the interrogator shall be maintained when the power density of the transponder signal at the interrogator antenna is between the minimum values given in 3.5.4.1.5 and a maximum of minus 18 dBW/m2. 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 23/11/06 3.5.5.3.2.4 DME P The performance of the interrogator shall be maintained when the power density of the transponder signal at the interrogator antenna is between the minimum values given in 3.5.4.1.5 and a maximum of minus 18 dBW/m2. 3.5.5.3.3 andwidth 3.5.5.3.3.1 DME N The receiver bandwidth shall be sufficient to allow compliance with 3.5.3.1.3, when the input signals are those specified in 3.5.4.1.3. 3.5.5.3.3.2 DME P IA mode The receiver bandwidth shall be sufficient to allow compliance with 3.5.3.1.3 when the input signals are those specified in 3.5.4.1.3. The 12-dB bandwidth shall not exceed 2 MHz and the 60-dB bandwidth shall not exceed 10 MHz. 3.5.5.3.3.3 DME P FA mode The receiver bandwidth shall be sufficient to allow compliance with 3.5.3.1.3 when the input signals are those specified in 3.5.5.1.3. The 12-dB bandwidth shall not exceed 6 MHz and the 60-dB bandwidth shall not exceed 20 MHz. 3.5.5.3.4 Interference rejection 3.5.5.3.4.1 When there is a ratio of desired to undesired co-channel DME signals of at least 8 dB at the input terminals of the airborne receiver, the interrogator shall display distance information and provide unambiguous identification from the stronger signal. Note Co channel refers to those reply signals that utili e the same fre uency and the same pulse pair spacing 3.5.5.3.4.2 DME N DME signals greater than 900 kHz removed from the desired channel nominal frequency and having amplitudes up to 42 dB above the threshold sensitivity shall be rejected. 3.5.5.3.4.3 DME P DME signals greater than 900 kHz removed from the desired channel nominal frequency and having amplitudes up to 42 dB above the threshold sensitivity shall be rejected. 3.5.5.3.5 Decoding 3.5.5.3.5.1 The interrogator shall include a decoding circuit such that the receiver can be triggered only by pairs of received pulses having pulse duration and pulse spacings appropriate to transponder signals as described in 3.5.4.1.4. 3.5.5.3.5.2 DME N Decoder rejection A reply pulse pair with a spacing of plus or minus 2 microseconds, or more, from the nominal value and with any signal level up to 42 dB above the receiver sensitivity shall be rejected. 3.5.5.3.5.3 DME P Decoder rejection A reply pulse pair with a spacing of plus or minus 2 microseconds, or more, from the nominal value and with any signal level up to 42 dB above the receiver sensitivity shall be rejected. 3.5.5.4 Accuracy 3.5.5.4.1 DME N The interrogator shall not contribute more than plus or minus 315 m (plus or minus 0.17 NM) to the overall system error. 3.5.5.4.2 DME P IA mode The interrogator shall not contribute more than plus or minus 30 m (plus or minus 100 ft) to the overall system PFE and not more than plus or minus 15 m (plus or minus 50 ft) to the overall system CMN. 2007/70/II. szám C a ter Annex 10 — Aeronautical Communications 23/11/06 3.5.5.4.3 DME P FA mode 3.5.5.4.3.1 Accuracy standard The interrogator shall not contribute more than plus or minus 15 m (plus or minus 50 ft) to the overall system PFE and not more than plus or minus 10 m (plus or minus 33 ft) to the overall system CMN. 3.5.5.4.3.2 Accuracy standard The interrogator shall not contribute more than plus or minus 7 m (plus or minus 23 ft) to the overall system PFE and not more than plus or minus 7 m (plus or minus 23 ft) to the overall system CMN. Note uidance material on filters to assist in achieving this accuracy is given in Attachment C 3.5.5.4.4 DME P The interrogator shall achieve the accuracy specified in 3.5.3.1.3.4 with a system efficiency of 50 per cent or more. Note uidance material on system efficiency is given in Attachment C 3 6 Specification for en route HF marker beacons H 3.6.1 Equipment 3.6.1.1 Fre uencies The emissions of an en-route VHF marker beacon shall have a radio frequency of 75 MHz plus or minus 0.005 per cent. 3.6.1.2 Characteristics of emissions 3.6.1.2.1 Radio marker beacons shall radiate an uninterrupted carrier modulated to a depth of not less than 95 per cent or more than 100 per cent. The total harmonic content of the modulation shall not exceed 15 per cent. 3.6.1.2.2 The frequency of the modulating tone shall be 3 000 Hz plus or minus 75 Hz. 3.6.1.2.3 The radiation shall be horizontally polarized. 3.6.1.2.4 Identification If a coded identification is required at a radio marker beacon, the modulating tone shall be keyed so as to transmit dots or dashes or both in an appropriate sequence. The mode of keying shall be such as to provide a dot-and-dash duration together with spacing intervals corresponding to transmission at a rate equivalent to approximately six to ten words per minute. The carrier shall not be interrupted during identification. 3.6.1.2.5 Coverage and radiation pattern Note The coverage and radiation pattern of mar er beacons will ordinarily be established by Contracting States on the basis of operational re uirements ta ing into account recommendations of regional meetings The most desirable radiation pattern would be one that

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