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in the angle data which exceed those obtained with a single pole low-pass filter with a corner frequency of 10 rad/s by more
than 20 per cent.
Note.— Receiver outputs intended only to operate visual displays may benefit from appropriate additional filtering.
Additional information on output data filtering is given in Attachment G, 7.4.2.
3.11.6.1.4 Adjacent channel spurious response. The receiver performance specified in 3.11.6 shall be met when the
ratio between the desired tracked signals and the noise produced by the adjacent channel signals in a 150 kHz bandwidth
centred around the desired frequency is equal to or greater than the signal-to-noise ratio (SNR) values:
a) as specified in Table X1 when the power density received from the desired ground station is equal to or higher than
the values as specified in Table Y, or
b) as specified in the Table X2 when the power density received from the desired ground station is between the
minimum density power values specified in 3.11.4.10.1 and the values specified in Table Y.
Chapter 3 Annex 10 — Aeronautical Communications
3-99 23/11/06
Table Y
Beam width (Note 2)
Function 1o 2o 3o
Approach azimuth guidance –69.8 dBW/m2 –63.8 dBW/m2 –60.2 dBW/m2
High rate approach azimuth guidance –74.6 dBW/m2 –69.5 dBW/m2 –65 dBW/m2
Approach elevation guidance –71 dBW/m2 –65 dBW/m2 N/A
Back azimuth N/A (Note 4) N/A (Note 4) N/A (Note 4)
Table X1
SNR (Note 1)
Beam width (Note 2)
Function Data 1o 2o 3o
Approach azimuth guidance 5 dB 24.7 dB 30.7 dB 34.3 dB
High rate approach azimuth
guidance
5 dB 19.9 dB 26 dB 29.5 dB
Approach elevation guidance 5 dB 23.5 dB 29.5 dB N/A
Back azimuth (Note 4) 5 dB 5.2 dB 11.2 dB 14.8 dB
Table X2
SNR (Note 1)
Beam width (Note 2)
Function Data 1o 2o 3o
Approach azimuth guidance 5 dB 8.2 dB 14.3 dB 17.8 dB
High rate approach azimuth
guidance
5 dB 3.5 dB 9.5 dB 13 dB
Approach elevation guidance 5 dB 3.5 dB 9.5 dB N/A
Back azimuth (Note 4) 5 dB 5.2 dB 11.2 dB 14.8 dB
Note 1.— When the radiated desired signal power density is high enough to cause the airborne receiver noise
contribution to be insignificant, the airborne CMN contribution for elevation and approach azimuth guidance (not for back
azimuth) is required as stated in 3.11.6.1.1, to be reduced compared to the CMN contribution when the radiated desired
signal power density is at the minimum specified in 3.11.4.10.1 and the minimum SNR values are therefore higher.
Note 2.— The relationship is linear between adjacent points designated by the beam widths.
Note 3.— These SNR values are to be protected through application of frequency separation criteria as explained in
Attachment G, 9.3.
Note 4.— As there is no change in back azimuth guidance accuracy when the airborne receiver noise may be considered
as insignificant, the same SNR values are applied for back azimuth.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-100
Table A. DME/MLS angle, DME/VOR and DME/ILS/MLS channelling and pairing
DME parameters
Interrogation Reply
Pulse codes
Channel pairing DME/P mode
DME
channel
number
VHF
frequency
MHz
MLS
angle
frequency
MHz
MLS
channel
number
Frequency
MHz
DME/N
μs
Initial
approach
μs
Final
approach
μs
Frequency
MHz
Pulse
codes
μs
*1X – – – 1 025 12 – – 962 12
**1Y – – – 1 025 36 – – 1 088 30
*2X – – – 1 026 12 – – 963 12
**2Y – – – 1 026 36 – – 1 089 30
*3X – – – 1 027 12 – – 964 12
**3Y – – – 1 027 36 – – 1 090 30
*4X – – – 1 028 12 – – 965 12
**4Y – – – 1 028 36 – – 1 091 30
*5X – – – 1 029 12 – – 966 12
**5Y – – – 1 029 36 – – 1 092 30
*6X – – – 1 030 12 – – 967 12
**6Y – – – 1 030 36 – – 1 093 30
*7X – – – 1 031 12 – – 968 12
**7Y – – – 1 031 36 – – 1 094 30
*8X – – – 1 032 12 – – 969 12
**8Y – – – 1 032 36 – – 1 095 30
*9X – – – 1 033 12 – – 970 12
**9Y – – – 1 033 36 – – 1 096 30
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