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107.225 MHz –105 dBc –47 dBm/100 kHz
107.625 MHz –101.5 dBc –53.5 dBm/10 kHz
107.825 MHz –88.5 dBc –40.5 dBm/10 kHz
107.925 MHz –74 dBc –36 dBm/1 kHz
107.9625 MHz –71 dBc –33 dBm/1 kHz
107.975 MHz –65 dBc –27 dBm/1 kHz
118.000 MHz –65 dBc –27 dBm/1 kHz
118.0125 MHz –71 dBc –33 dBm/1 kHz
118.050 MHz –74 dBc –36 dBm/1 kHz
118.150 MHz –88.5 dBc –40.5 dBm/10 kHz
118.350 MHz –101.5 dBc –53.5 dBm/10 kHz
118.750 MHz –105 dBc –47 dBm/100 kHz
119.550 MHz –113 dBc –55 dBm/100 kHz
119.850 MHz to 1 GHz –115 dBc –57 dBm/100 kHz
1 GHz to 1.7 GHz –115 dBc –47 dBm/1 MHz
NOTES.—
1. The maximum unwanted emission level (absolute power) applies if the authorized transmitter power
exceeds 150 W.
2. The relative unwanted emission level is to be computed using the same bandwidth for desired and
unwanted signals. This may require conversion of the measurement for unwanted signals done using
the bandwidth indicated in the maximum unwanted emission level column of this table.
3. This value is driven by measurement limitations. Actual performance is expected to be better.
4. The relationship is linear between single adjacent points designated by the adjacent channels identified
above.
3.8 (Reserved)
3.9 System characteristics of airborne ADF receiving systems
3.9.1 Accuracy of bearing indication
3.9.1.1 The bearing given by the ADF system shall not be in error by more than plus or minus 5 degrees with a radio
signal from any direction having a field strength of 70 microvolts per metre or more radiated from an LF/MF NDB or locator
operating within the tolerances permitted by this Annex and in the presence also of an unwanted signal from a direction
90 degrees from the wanted signal and:
Chapter 3 Annex 10 — Aeronautical Communications
3-73 23/11/06
a) on the same frequency and 15 dB weaker; or
b) plus or minus 2 kHz away and 4 dB weaker; or
c) plus or minus 6 kHz or more away and 55 dB stronger.
Note.— The above bearing error is exclusive of aircraft magnetic compass error.
3.10 (Reserved)
3.11 Microwave landing system (MLS) characteristics
3.11.1 Definitions
Auxiliary data. Data, transmitted in addition to basic data, that provide ground equipment siting information for use in
refining airborne position calculations and other supplementary information.
Basic data. Data transmitted by the ground equipment that are associated directly with the operation of the landing guidance
system.
Beam centre. The midpoint between the two minus 3-dB points on the leading and trailing edges of the scanning beam main
lobe.
Beamwidth. The width of the scanning beam main lobe measured at the minus 3-dB points and defined in angular units on
the boresight, in the horizontal plane for the azimuth function and in the vertical plane for the elevation function.
Clearance guidance sector. The volume of airspace, inside the coverage sector, within which the azimuth guidance
information provided is not proportional to the angular displacement of the aircraft, but is a constant left or right
indication of which side the aircraft is with respect to the proportional guidance sector.
Control motion noise (CMN). That portion of the guidance signal error which causes control surface, wheel and column
motion and could affect aircraft attitude angle during coupled flight, but does not cause aircraft displacement from the
desired course and/or glide path. (See 3.5.)
Coordinate system — conical. A function is said to use conical coordinates when the decoded guidance angle varies as the
minimum angle between the surface of a cone containing the receiver antenna, and a plane perpendicular to the axis of
the cone and passing through its apex. The apex of the cone is at the antenna phase centre. For approach azimuth or back
azimuth functions, the plane is the vertical plane containing the runway centre line. For elevation functions, the plane is
horizontal.
Coordinate system — planar. A function is said to use planar coordinates when the decoded guidance angle varies as the
angle between the plane containing the receiver antenna and a reference plane. For azimuth functions, the reference
plane is the vertical plane containing the runway centre line and the plane containing the receiver antenna is a vertical
plane passing through the antenna phase centre.
Coverage sector. A volume of airspace within which service is provided by a particular function and in which the signal
power density is equal to or greater than the specified minimum.
Annex 10 — Aeronautical Communications Volume I
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