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Required transmitter power (dBm) 42.5 39.0 31.4 40.4 41.1 41.6 33.8 40.3 37.1 23.4 31.7 37.2
Example 20 watt transmitter (dBm) 43.0 43.0 43.0 43.0 43.0 43.0 43.0 43.0 43.0 43.0 43.0 43.0
Transmitter power margin (dB) 0.5 4.0 11.6 2.6 1.9 1.4 9.2 2.7 5.9 19.6 11.3 5.8
NOTES.—
1. Losses and antenna gains are representative values.
2. High data rate for 3° azimuth beamwidth will reduce required transmitter power by 4.8 dB.
3. Distance to azimuth antenna taken as 41.7 km (22.5 NM).
4. Distance to back azimuth antenna taken as 23.1 km (12.5 nautical miles).
5. The required transmitter power can be reduced by using higher efficiency antennas.
Attachment G Annex 10 — Aeronautical Communications
Table G-2. Airborne power budget
Approach azimuth function Elevation function Back azimuth function
Angle BW Angle BW Angle BW
Power budget items DPSK Clearance 1° 2° 3°
3°
(Note 1) 1° 2° 1° 2° 3°
IF SNR (dB) required for:
a) 72% decode rate
b) 0.1° CMN (Note 2)
c) Acquisition
5.0
—
—
—
—
6.5
—
8.8
—
—
14.8
—
—
18.3
—
—
13.5
—
—
—
6.5
—
10.0
—
—
—
6.5
—
11.8
—
—
15.3
—
Noise power in 150 kHz
IF bandwidth (dBm)
–122.0
–122.0
–122.0
–122.0
–122.0
–122.0
–122.0
–122.0
–122.0
–122.0
–122.0
Signal power required
at IF (dBm)
–117.0
–115.5
–113.2
–107.2
–103.7
–108.5
–115.5
–112.0
–115.5
–110.2
–106.7
Noise figure (dB) 11 11 11 11 11 11 11 11 11 11 11
Cable loss (Note 3) (dB) 5 5 5 5 5 5 5 5 5 5 5
Airborne antenna gain (dBi) 0 0 0 0 0 0 0 0 0 0 0
Margin (dB) 6 6 6 6 6 6 6 6 6 6 6
Signal required at
aircraft (dBm)
–95.0 –93.5 –91.2 –85.2 –81.7 –86.5 –93.5 –90.0 –93.5 –88.2 –84.7
NOTES.—
1. High rate approach azimuth function.
2. 0.2° CMN for the back azimuth function.
3. Provides for either front or rear antenna cable losses in typical installations. Additional losses (up to 11 dB) may be accommodated by air carrier class
avionics.
Table G-3. Sample RNAV procedures for MLS installation on Runway 23R
(see Figure G-15)
Procedure name
Procedure
type Runway
Missed
approach
Number of
way-points
AAZ
or BAZ
KASEL-1-A Approach 23R Yes 4 AAZ
NELSO-1-B Approach 23R Yes 3 AAZ
N/A Missed approach 23R N/A 2 AAZ
SEMOR-1-C Approach 26 (Note) No 2 AAZ
LAWSO-6-D Departure 23R N/A 3 BAZ
Note.— Runway 26 is a secondary runway. The virtual azimuth to way-point distance is 3 000 m.
ATT G-45 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table G-4. Sample way-point information for MLS/RNAV procedures
Basic indicator
Validity
indicator
Route
indicator
Way-point
number
X
(metres)
Y
(metres)
Z
(metres) Notes
KASEL 1 A 4 8 200 –9 094 N/A No Z
3 9 954 –5 336 789 PFAF
2 6 556 0 344 No Z, No Y
1 259 0 16.8 (Note) Threshold
NELSO 1 B 3 9 742 6 499 819 PFAF
2 6 556 0 344 Shared with
KASEL
1 259 0 16.8 (Note) Shared with
KASEL
N/A (missed
approach)
N/A N/A 2 –7 408 0 N/A No Z, No Y
1 0 0 N/A No Z, No Y
SEMOR 1 C 2 5 567 –5 276 346 PFAF
1 159 –2 401 16 Threshold
LAWSO 6 D 3 –8 018 3 057 N/A No Z
2 –4 964 0 N/A No Z, No Y
1 0 0 N/A No Z, No Y
Note.— This value is the threshold crossing height, referenced to ground level at threshold. The height of the threshold with respect
to the MLS datum point is given in auxiliary word A2.
23/11/06 ATT G-46
Attachment G Annex 10 — Aeronautical Communications
Table G-5. Example of B1 and B39 data word assignments
Data word
title
Data
word Bit numbers Data item Value Coding
B1 I21-24 Number of procedure descriptors 3 1100
I25-30 Last approach azimuth database word 11 001011
(Note 2)
I31-62 CRC code See Table G-9
I63 Word B42 transmitted No 0
I64 Word A4 transmitted Yes 1
I65 Word B43 transmitted No 0
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