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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 utilize the same frequency 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.
Chapter 3 Annex 10 — Aeronautical Communications
3-57 23/11/06
3.5.5.4.3 DME/P — FA mode
3.5.5.4.3.1 Accuracy standard 1. 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 2. 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.— Guidance material on filters to assist in achieving this accuracy is given in Attachment C, 7.3.4.
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.— Guidance material on system efficiency is given in Attachment C, 7.1.1.
3.6 Specification for en-route VHF marker beacons (75 MHz)
3.6.1 Equipment
3.6.1.1 Frequencies. 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 marker beacons will ordinarily be established by Contracting States on
the basis of operational requirements, taking into account recommendations of regional meetings.
The most desirable radiation pattern would be one that:
a) in the case of fan marker beacons, results in lamp operation only when the aircraft is within a rectangular
parallelepiped, symmetrical about the vertical line through the marker beacon and with the major and minor axes
adjusted in accordance with the flight path served;
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-58
b) in the case of a Z marker beacon, results in lamp operation only when the aircraft is within a cylinder, the axis of
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