Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3141

c) 80 per cent for DME/P FA mode. 3.5.4.2.3.3 DME N dynamic range The performance of the transponder shall be maintained when the power density of the interrogation signal at the transponder antenna has any value between the minimum specified in 3.5.4.2.3.1 up to a maximum of minus 22 dBW/m2 when installed with ILS or MLS and minus 35 dBW/m2 when installed for other applications. 3.5.4.2.3.4 DME P dynamic range The performance of the transponder shall be maintained when the power density of the interrogation signal at the transponder antenna has any value between the minimum specified in 3.5.4.2.3.1 up to a maximum of minus 22 dBW/m2. 3.5.4.2.3.5 The transponder sensitivity level shall not vary by more than 1 dB for transponder loadings between 0 and 90 per cent of its maximum transmission rate. 3.5.4.2.3.6 DME N When the spacing of an interrogator pulse pair varies from the nominal value by up to plus or minus 1 microsecond, the receiver sensitivity shall not be reduced by more than 1 dB. 3.5.4.2.3.7 DME P When the spacing of an interrogator pulse pair varies from the nominal value by up to plus or minus 1 microsecond, the receiver sensitivity shall not be reduced by more than 1 dB. 3.5.4.2.4 oad limiting 3.5.4.2.4.1 DME N Recommendation hen transponder loading exceeds per cent of the maximum transmission rate the receiver sensitivity should be automatically reduced in order to limit the transponder replies so as to ensure that the maximum permissible transmission rate is not exceeded (The available range of sensitivity reduction should be at least d ) 3.5.4.2.4.2 DME P To prevent transponder overloading the transponder shall automatically limit its replies, so as to ensure that the maximum transmission rate is not exceeded. If the receiver sensitivity reduction is implemented to meet this requirement, it shall be applied to the IA mode only and shall not affect the FA mode. 3.5.4.2.5 Noise When the receiver is interrogated at the power densities specified in 3.5.4.2.3.1 to produce a transmission rate equal to 90 per cent of the maximum, the noise generated pulse pairs shall not exceed 5 per cent of the maximum transmission rate. 3.5.4.2.6 andwidth 3.5.4.2.6.1 The minimum permissible bandwidth of the receiver shall be such that the transponder sensitivity level shall not deteriorate by more than 3 dB when the total receiver drift is added to an incoming interrogation frequency drift of plus or minus 100 kHz. 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 23/11/06 3.5.4.2.6.2 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 3.5.5.1.3. 3.5.4.2.6.3 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 3.5.5.1.3. The 12 dB bandwidth shall not exceed 2 MHz and the 60 dB bandwidth shall not exceed 10 MHz. 3.5.4.2.6.4 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. 3.5.4.2.6.5 Signals greater than 900 kHz removed from the desired channel nominal frequency and having power densities up to the values specified in 3.5.4.2.3.3 for DME/N and 3.5.4.2.3.4 for DME/P shall not trigger the transponder. Signals arriving at the intermediate frequency shall be suppressed at least 80 dB. All other spurious response or signals within the 960 MHz to 1 215 MHz band and image frequencies shall be suppressed at least 75 dB. 3.5.4.2.7 Recovery time Within 8 microseconds of the reception of a signal between 0 dB and 60 dB above minimum sensitivity level, the minimum sensitivity level of the transponder to a desired signal shall be within 3 dB of the value obtained in the absence of signals. This requirement shall be met with echo suppression circuits, if any, rendered inoperative. The 8 microseconds are to be measured between the half voltage points on the leading edges of the two signals, both of which conform in shape, with the specifications in 3.5.5.1.3. 3.5.4.2.8 Spurious radiations Radiation from any part of the receiver or allied circuits shall meet the requirements stated in 3.5.4.1.6. 3.5.4.2.9 C and echo suppression Recommendation C and echo suppression should be ade uate for the sites at which the transponders will be used Note In this connection echoes mean undesired signals caused by multipath transmission (reflections etc ) 3.5.4.2.10 Protection against interference Recommendation Protection against interference outside the DME fre uency band should be ade uate for the sites at which the transponders will be used 3.5.4.3 Decoding 3.5.4.3.1 The transponder shall include a decoding circuit such that the transponder can be triggered only by pairs of received pulses having pulse duration and pulse spacings appropriate to interrogator signals as described in 3.5.5.1.3 and 3.5.5.1.4. 3.5.4.3.2 The decoding circuit performance shall not be affected by signals arriving before, between, or after, the constituent pulses of a pair of the correct spacing. 3.5.4.3.3 DME N Decoder rejection An interrogation pulse pair with a spacing of plus or minus 2 microseconds, or more, from the nominal value and with any signal level up to the value specified in 3.5.4.2.3.3 shall be rejected such that the transmission rate does not exceed the value obtained when interrogations are absent. 2007/70/II. szám C a ter Annex 10 — Aeronautical Communications 23/11/06 3.5.4.3.4 DME P Decoder rejection An interrogation pulse pair with a spacing of plus or minus 2 microseconds, or more, from the nominal value and with any signal level up to the value specified in 3.5.4.2.3.4 shall be rejected such that the transmission rate does not exceed the value obtained when interrogations are absent. 3.5.4.4 Time delay 3.5.4.4.1 When a DME is associated only with a VHF facility, the time delay shall be the interval from the half voltage point on the leading edge of the second constituent pulse of the interrogation pair and the half voltage point on the leading edge of the second constituent pulse of the reply transmission. This delay shall be consistent with the following table, when it is desired that aircraft interrogators are to indicate distance from the transponder site. Pulse pair spacing ( s) Time delay ( s) Channel suffix perating mode Interrogation Reply st pulse timing nd pulse timing X DME/N DME/P IA M DME/P FA M Y DME/N DME/P IA M DME/P FA M W DME/N DME/P IA M DME/P FA M DME/N DME/P IA M DME/P FA M Note and are multiplexed on the same fre uency Note and are multiplexed on the same fre uency 3.5.4.4.2 When a DME is associated with an MLS angle facility, the time delay shall be the interval from the half voltage point on the leading edge of the first constituent pulse of the interrogation pair and the half voltage point on the leading edge of the first constituent pulse of the reply transmission. This delay shall be 50 microseconds for mode X channels and 56 microseconds for mode Y channels, when it is desired that aircraft interrogators are to indicate distance from the transponder site. 3.5.4.4.2.1 For DME/P transponders, no time delay adjustment shall be permitted. 3.5.4.4.3 Recommendation For the DME N the transponder time delay should be capable of being set to an appropriate value between the nominal value of the time delay minus microseconds and the nominal value of the time delay to permit aircraft interrogators to indicate ero distance at a specific point remote from the transponder site 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 23/11/06 Note Modes not allowing for the full microseconds range of adjustment in transponder time delay may only be adjustable to the limits given by the transponder circuit delay and recovery time 3.5.4.4.3.1 DME N The time delay shall be the interval from the half voltage point on the leading edge of the first constituent pulse of the interrogation pair and the half voltage point on the leading edge of the first constituent pulse of the reply transmission. 3.5.4.4.3.2 DME P IA mode The time delay shall be the interval from the half voltage point on the leading edge of the first constituent pulse of the interrogation pulse pair to the half voltage point on the leading edge of the first constituent pulse of the reply pulse pair. 3.5.4.4.3.3 DME P FA mode The time delay shall be the interval from the virtual origin of the first constituent pulse of the interrogation pulse pair to the virtual origin of the first constituent pulse of the reply pulse pair. The time of arrival measurement points shall be within the partial rise time of the first constituent pulse of the pulse pair in each case. 3.5.4.4.4 DME N Recommendation Transponders should be sited as near to the point at which ero indication is re uired as is practicable Note It is desirable that the radius of the sphere at the surface of which ero indication is given be ept as small as possible in order to eep the one of ambiguity to a minimum Note uidance material on siting DME with M S is provided in of Attachment C and of Attachment This guidance material sets forth in particular appropriate steps to be ta en to prevent different ero range indication if DME P associated with M S and DME N associated with I S serve the same runway 3.5.4.5 Accuracy 3.5.4.5.1 DME N The transponder shall not contribute more than plus or minus 1 microsecond (150 m (500 ft)) to the overall system error. 3.5.4.5.2 DME N A transponder associated with a landing aid shall not contribute more than plus or minus 0.5 microsecond (75 m (250 ft)) to the overall system error. 3.5.4.5.3 DME P FA mode 3.5.4.5.3.1 Accuracy standard The transponder shall not contribute more than plus or minus 10 m (plus or minus 33 ft) PFE and plus or minus 8 m (plus or minus 26 ft) CMN to the overall system error. 3.5.4.5.3.2 Accuracy standard The transponder shall not contribute more than plus or minus 5 m (plus or minus 16 ft) PFE and plus or minus 5 m (plus or minus 16 ft) CMN to the overall system error. 3.5.4.5.4 DME P IA mode The transponder shall not contribute more than plus or minus 15 m (plus or minus 50 ft) PFE and plus or minus 10 m (plus or minus 33 ft) CMN to the overall system error. 3.5.4.5.5 Recommendation hen a DME is associated with an M S angle facility the above accuracy should include the error introduced by the first pulse detection due to the pulse spacing tolerances 2007/70/II. szám C a ter Annex 10 — Aeronautical Communications 23/11/06 3.5.4.6 Efficiency 3.5.4.6.1 The transponder reply efficiency shall be at least 70 per cent for DME/N and DME/P (IA mode) and 80 per cent for DME/P (FA mode) at all values of transponder loading up to the loading corresponding to 3.5.3.5 and at the minimum sensitivity level specified in 3.5.4.2.3.1 and 3.5.4.2.3.5. Note hen considering the transponder reply efficiency value account is to be ta en of the DME dead time and of the loading introduced by the monitoring function 3.5.4.6.2 Transponder dead time The transponder shall be rendered inoperative for a period normally not to exceed 60 microseconds after a valid interrogation decode has occurred. In extreme cases when the geographical site of the transponder is such as to produce undesirable reflection problems, the dead time may be increased but only by the minimum amount necessary to allow the suppression of echoes for DME/N and DME/P IA mode. 3.5.4.6.2.1 In DME/P the IA mode dead time shall not blank the FA mode channel and vice versa. 3.5.4.7 Monitoring and control 3.5.4.7.1 Means shall be provided at each transponder site for the automatic monitoring and control of the transponder in use. 3.5.4.7.2 DME N monitoring action 3.5.4.7.2.1 In the event that any of the conditions specified in 3.5.4.7.2.2 occur, the monitor shall cause the following action to take place:

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