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link (VDL) communications system used in the international
aeronautical mobile service shall be in conformity with the
following specifications:
6.1.4.1.1 The radio frequencies used shall be selected
from the radio frequencies in the band 117.975 - 137 MHz in
accordance with the conditions of Radio Regulation 595. The
lowest assignable frequency shall be 1 18.000 MHz and the
highest assignable frequency shall be 136.975 MHz. The
separation between assignable frequencies (channel spacing)
shall be 25 kHz.
Note.- Volume V specifies that the block of frequencies
fiom 136.9 - 136.975 MHz inclusive is reserved for VHF airground
digital communications.
6.1.4.1.2 The design polarization of emissions shall be
vertical.
6.2 SYSTEM CHARACTERISTICS OF
THE GROUND INSTALLATION
6.2.1 Ground station
transmitting function
6.2.4 Adjacent channel emissions
6.2.4.1 The amount of power from a VDL ground transmitter
under all operating conditions when measured over the
25 kHz channel bandwidth of the first adjacent channel shall
not exceed 0 dBm.
6.2.4.2 The amount of power from a VDL ground transmitter
under all operating conditions when measured over the
25 kHz channel bandwidth of the second adjacent channel
shall be less than minus 25 dBm and From thereon it shall
monotonically decrease at the minimum rate of 5 dB per
octave to a maximum value of minus 52 dBm.
6.2.4.3 The amount of power from a VDL ground transmitter
under all operating conditions when measured over a
16 kHz channel bandwidth centred on the first adjacent
channel shall not exceed minus 20 dBm.
6.3 SYSTEM CHARACTERISTICS OF
THE AIRBORNE INSTALLATION
6.3.1 Frequency stability. The radio frequency of VDL
airborne equipment shall not vary mote than plus or minus
0.0005 per cent (5 parts per million) from the assigned
6.2.1.1 Frequency stability. The radio frequency of VDL
frequency.
ground station equipment operation shall not &y more than Note.- The frequency stability for VDL airborne stufions plus or minus 0.0002 per cent (2 parts per million) from the using DSB-AM modulation is specified in Volume III, Part II,
assigned frequency. Chapter 2 for 25 kHz channel spacing.
Note.- The frequency stability for VDL ground sfutions 6.3.2 Power. The effective radiated power shall be such
usihg DSB-AM modulation is specified in Volume III, Part II, as to provide a field strength of at least 20 microvolls per
Chapter 2 for 25 kHz channel spacing. metre (minus 120 d13w/m2) (minus 87 dBm) on the basis of
frcc space propagation, at ranges and altitudes appropriate to
the operational conditions pertaining to the areas over which
6.2.2 Power the aircraft is operated.
Recornmendation.- The effective radiatedpower sbuld be
such as to provide a jeld strength of at least 75 microvolfs per
metre (minus 109 dBw/m2) within the defined operational
coverage of thefacility, on the basis offree-spathe propagation.
6.2.3 Spurious emissions
6.2.3.1 Spurious emissions shall be kept at the lowest
value which the state of the technique and the nature of the
service permit.
6.3.3 Spurious emissions
6.3.3.1 Spurious emissions shall be kept at the lowest
value which the state of the technique and the nature of
service permit.
Note.- Appendix 8 to the Radio Regulations contains the
tolerances for the levels of spurious emission to which
transmitters must conform in accordance with Radio
Regulation 304.
Part I Annex 10 - Aeronautical Xelecomrnunications
6.3.4 Adjacent channel emissions
6.3.4.1 The amount of power from a VDL airborne
transmitter under all operating conditions when measured over
the 25 H z channel bandwidth of the first adjacent channel
shall not exceed 0 dBm.
6.3.4.2 The amount of power from a VDL airborne
transmitter under all operating conditions when measured over
the 25 kHz channel bandwidth of the second adjacent channel
shall be less than minus 25 dBm and from thereon it shall
monotonically decrease at the minimum rate of 5 dl3 per
octave to a maximum value of minus 52 dBm.
6.3.4.3 The amount of power from a VDL airborne
transmitter under all operating conditions when measured over
a 16 kHz channel bandwidth centred on the first adjacent
channel shall not exceed minus 20 dBm.
6.3.5 Receiving function
6.3.5.1 Specified error rate. The specified error rate
shall be the maximum corrected Bit Error Rate of 1 in lo4.
40 microvolts per metre, and with one or more out-of-band
signals, except for VHF FM broadcast signals, having a total
level at the receiver input of minus 33 dBm.
Note.- In areas where adjacent higher band signal interference
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