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6.2.1 Ground station
transmitting function
6.2.1.1 Frequency stability. The radio frequency of VDL
ground station equipment operation shall not vary more than
plus or minus 0.0002 per cent (2 parts per million) from the
assigned frequency.
Note.- The frequency stability for VDL ground stations
using DSB-AM modulation is specified in Volume 111, Part II,
Chapter 2 for 25 kHz channel spacing.
6.2.2 Power
Recommendation.- The efective rudiated power should
be such as to provide afield strength of ut least 75 microvolts
per metre (minus 109 d ~ ~ /wmithi~n t)he defined operational
coverage ofthe facility, on the basis offree-space propugation.
6.2.3 Spurious emissions
6.2.3.1 Spurious emissions shall be kept at the lowest
6.1.3*4 transition. A VDLLcqui~~ed value which the state of the technique and the nature of the
aircraft shall transition from one ground station to another permit.
when circumstances dictate.
Note.- Appendix S3 to the Radio Regulations speciJies the
6.1.3.5 Voice capabilit>r The VDL Mode 3 system shall levsEs of spurious enzissions to which transmitters must
support a transparent, simplex voice operation based on a conform.
"Listen-Before-Push-To-Talk" channel access.
6.1.4 Air-ground VHF digital 6.2.4 Adjacent channel emissions
link communications
system characteristics 6.2.4.1 The amount of power from a VDL ground
transmitter under all operating conditions whcn measured over
6.1.4.1 The radio frequencies used shall be selected from the 25 lcHz cbanncl bandwidth of the first adjacent channel
the radio frequencies in the band 117.975 - 137 MHz. The shall not exceed 0 dBm.
1/11/01
No. 76
Annex 10 - Aeronautical Telecommunications Volume 111
6.2.4.1.1 After 1 January 2002, the amount of power from
all new installations of a VDL ground transmitter under all
operating conditions when measured over the 25 kHz channel
bandwidth of the first adjacent channel shall not cxcecd
2 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
monobnically decrease at the minimum rate of 5 dB per
octave to a maximum value of minus 52 dBm.
6.3.2 Povver. Thc effective radiated power shall be such as
to provide a field strength of at least 20 microvolts per metre
(minus 120 d ~ w / r n o~n) t he basis of free space propagation,
at ranges and altitudes appropriate to the operational
conditions pertaining to the areas over which the aircraft is
operated.
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.
6.2.4.2.1 After 1 January 2002, the amount of power from
all new installations of a VDL ground transmitter under all
Note.-- Appendix S3 to the Radio Regulations specifies the
operatjng conditions when measured over the 25 H z channel kvels of spunour emirsion to rcrs must
bandwidth of the second adjacent channel shall be less than
minus 28 dBm.
6.2.4.2.2 After 1 January 2002, the amount of power from
all new installations of a VDL ground transmitter under all 6.3.4 Adjacent channel emissions
operating conditions when measured over the 25 kHz channel
bandwidth of he fourth adjacent channel shall be less ~han 6.3.4.1 Thc amount of power from a VDL aircraft
minus 38 dBm, and from thereon it shall monotonically transmitter under all operating conditions when measured over
decrease at the minimum rate of 5 d~ per octave to a the 25 kHz channel bandwidth of the first adjacent channel
maximum value of minus 53 dBm. shall not exceed 0 dBm.
6.2.4.3 The amount of power from a VDL ground 6.3.4.1.1 After I January 2002, thc amount of power
transmitter under all operating conditions when measured over from all new installations of a VDL aircraft transmitter under
a 16 Hq2 channel bandwidth centered on h c first adjacent all operating conditions when measured over the 25 kHz
channel shall not exceed minus 20 dBm. channel bandwidth of the first adjacent channel shall not
exceed 2 dBm.
6.2.4.3.1 After 1 January 2002, the amount of power from
all new installations of 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 18 dBm.
6.2.4.4 After Z January 2005, all VDL ground
transmitters shall meet the provisions of 6.2.4.1.1, 6.2.4.2.1,
6.2.4.2.2 and 6.2.4.3.1, subject to the conditions of 6.2.4.5.
6.2.4.5 Requirements of mandatory compliance of the
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