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ANNEX 10 - VOLUME 111
7111196
279 No. 71
Annex 10 - Aeronautical Telecornrnunications
6.3.3 Adjacent channel emissions
Volume III
6.3.4.4 INTERFERENCE
IMMUNITY PERFORMANCE
6.3.3.1 The amount of powcr from a VDL airborne
transmitter under all operating conditions when measured over
1he 25 kHz channel bandwidth of the first adjacent channel
shall not exceed 0 dBm.
6.3.3.2 The amount of power from a VDL airborne
transmitter under all operating conditions when measured over
the 25 kHz channel bandwidth of thc 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 maxilnum value of minus 52 dBm.
6.3.3.3 The amount of power from a VDL airborne
transmitter under all opcrating conditions when measured over
a 16 kHz channel bandwidth centred on the first adjacent
channel shall not exceed minus 20 dBm.
6.3.4 Receiving function
6.3.4.4.1 The receiving function shall satisfy the specified
error rate with a nlinirnum desired field strength of 40
microvolts per metre, and with one or more out-of-band
signals, except for VHF F'M broadcast signals, having a total
level at the receiver input of minus 33 dBm.
Note.- In areas where adjacent higher band signal interference
exceeds this specifcation, a higher immunity requirenzent
will apply.
6.3.4.4.2 The receiving function shdl satisfy the specified
error rate with a minimum desired field strength of 40
microvolts per metrc, and with one or more VHF Fh4
broadcast signals having a total level at the receiver input of
minus 5 dBm.
6.4 TECHNICAL PROVISIONS RELATING TO
INTERNATIONAL AIR-GROUND
6.3.4.1 Specified error rare. For systems that employ DATA INTERCHANGE
block data coding techniques, the specified error rate shall be
the maximum corrected Block Failure Rate of I in lo4. For 6.4.1 When operating in the synchronous mode, the data
systems that do not employ block data coding techniques, the link be capab1e of code and byte independent
s~ecified error rate shall be the maximum uncorrected Bit mission of digica1 data.
~ r r oRr ate of 1 in 104.
6.4.2 Recommendation.- The data signalling rate
should be chosen from among the following:
6.3.4.2 Sensitivity, The receiving function shall satisfy
the specified error rate with a desired signal strength of at least 600 bits/s
20 microvolts per metre (minus 120 d ~ ~ l r(nmi~nujs 87 1 200 bits/s
dBm). 2 400 bits/s*
4 800 bits/s
Note.- The required signal strength at the edge of the 9 600 bits/s
service volume takes info account the requirements of the
system and signal losses within the systent, and considers * preferred minimum darn signalling rate.
en vjrufimefiral nutre sources.
Note.- Application to high frequency aeronautical mobile
6.3.4.3 Undesired signal rejection. 1 %re~ce iving func- channels be looked 'POn as a 'pecial case where the
tion shall satisfy the specified error rate with a minimum convention 75 x 2" bits/s is to be employed in rhe choice of a
desired 'irnal field strength of 40 mjcrovolts per metre (minus data signalling rate, where "n" is zero or a positive integer
117 d13w/m2) (minus 81 dBmj and with a maximum undesired
signal on the adjacent or any other assignable channel 40 dB
higher than the desired signal. 6.4.3 Recommendation.- When alphanumeric characters
are used the International Alphabet No. 5 (IA-5). in whole
or in parts thereof; shown in 8.6.1.2 below, should be used for
6.3.4.3.1 Recommendation.- The receiving funcrion *he transmission of air-ground dara.
should satisfy the specifed error rate with a rninimum desired
signal Jield strength of 40 microvolts per metre (minus 117 6.4.4 Thc serial transmission of units comprising an
d ~ ~(nzhfizzls~ 51 )dBm ) and with a maximum rmdesdrd individud character of I A - ~ be with the low unit
signal on the adjacent or any other assignable channel 60 dB (bl) transmitted first.
higher than the desired signal.
6.4.5 Recommendation.- When IA-5 is used, each
Note.- Guidance material on the measurement techxlique chamcter should include an additional unit for par-ity in the
is included in Annex 10, Volume C: Attachment A, section 7. eighth level position.
7/11/Y6
No. 71 280
Part I Annex 10 - Aeronautical Telecommunications
6.4.6 When the provisions of 6.4.5 are applied, the
sense of the character parity bit shall produce even parity in
links which operate on the start-stop principle and odd
parity in links using end-to-end synchronous operation.
6.4.7 Recommendation.- The vpe of rransmission
　
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