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it may be necessary to provide protection to airborne SSR in the band 1 015 MHz to 1 045 MHz. This protection may be
provided by limiting conducted and radiated CW to a level of the order of minus 77 dBW. Where this level cannot be
achieved, the required 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 frequencies are utilized in the VHF/DME pairing plan.
3.5.5.1.7 Recommendation.— The spurious pulse power received and measured under the conditions stated in
3.5.5.1.6 should be 80 dB below the required peak pulse power received.
Chapter 3 Annex 10 — Aeronautical Communications
3-55 23/11/06
Note.— Reference 3.5.5.1.6 and 3.5.5.1.7 — although limitation of spurious CW radiation between pulses to levels not
exceeding 80 dB below the peak 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 CW
to not more than 0.02 microwatt in the frequency band 1 015 MHz to 1 045 MHz. It is to be noted that only a few of these
frequencies are utilized in the VHF/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 Frequency 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 3.5.5.3.2.1 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 3.5.4.1.5.1 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.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-56
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 Bandwidth
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
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