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in any one kHz of receiver bandwidth.
3.5.4.1.6.4 The equivalent isotropically radiated power of any CW harmonic of the carrier frequency on any DME
operating channel shall not exceed minus 10 dBm.
3.5.4.2 Receiver
3.5.4.2.1 Frequency of operation. The receiver centre frequency shall be the interrogation frequency appropriate to the
assigned DME operating channel (see 3.5.3.3.3).
3.5.4.2.2 Frequency stability. The centre frequency of the receiver shall not vary more than plus or minus 0.002 per
cent from the assigned frequency.
3.5.4.2.3 Transponder sensitivity
3.5.4.2.3.1 In the absence of all interrogation pulse pairs, with the exception of those necessary to perform the sensitivity
measurement, interrogation pulse pairs with the correct spacing and nominal frequency shall trigger the transponder if the peak
power density at the transponder antenna is at least:
Chapter 3 Annex 10 — Aeronautical Communications
3-47 23/11/06
a) minus 103 dBW/m2 for DME/N;
b) minus 86 dBW/m2 for DME/P IA mode;
c) minus 75 dBW/m2 for DME/P FA mode.
3.5.4.2.3.2 The minimum power densities specified in 3.5.4.2.3.1 shall cause the transponder to reply with an
efficiency of at least:
a) 70 per cent for DME/N;
b) 70 per cent for DME/P IA mode;
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 Load limiting
3.5.4.2.4.1 DME/N. Recommendation.— When transponder loading exceeds 90 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 50 dB.)
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 Bandwidth
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.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-48
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.
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