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(metres)
a1
(metres)
θ0
(degrees)
A ≥5 0.39 0.9 5.7
B ≥5 0.105 0.25 5.5
23/11/06 APP B-114
Appendix B Annex 10 — Aeronautical Communications
Note.— Aircraft VHF data broadcast receiving antenna can be horizontally or vertically polarized. Due to the difference
3.6.8.2.2.4 VHF data broadcast time slot decoding. The VHF data broadcast receiver shall meet the requirements of
m the selected GBAS ground subsystem. These requirements shall be met in
ons in any and all time slots respecting the levels as indicated in 3.6.8.2.2.5.1 b).
Note.— Other GBAS transmissions may include: a) messages other than Type 1, 2 and 4 with the same SSID, and
) m
requirements of 3.6.8.2.2.3 for all Type 101 messages from the selected GBAS ground subsystem. These
quirements shall be met in the presence of other GBAS transmissions in any and all time slots respecting the levels as
3.6.8.2.2.5 Co-channel rejection
3.6.8.2.2.5.1 VHF data broadcast as the undesired signal source. The VHF data broadcast receiver shall meet the
requirements speci presence of an undesired co-channel VH ta broadcast signal that is either:
a) assigned t below the desired VHF dat signal power or lower; or
b) assigned d (s) and whose power is up to 15 dBm at the rec input.
3.6.8.2.2.5.2 VHF data broadcast receive meet the requirements specified in
3.6.8.2.2.3 in the p an undesired co-channel VOR signal that is 26 dB below the desired VHF data broadcast signal
power.
3.6.8.2.2.6 Adjacent
3.6.8.2.2.6.1 Fir et the requirements
specified in 3.6.8.2.2.3 e desired channel
that is either:
a) 18 dB above t he undesired signal is another VHF data broadcast signal assigned to
the same time slot(s); or
b) equal in power when the undesired signal is VOR.
3.6.8.2.2.6.2 Second a st receiver shall meet the
requirements specified in 3.6.8.2.2.3 in the presence of a transmitted undesired signal offset by 50 kHz on either side of the
desired channel that is either:
a) 43 dB above the desired signal power when the undesired signal is anoth HF data broadcast source assigned to
the same ti
b) 34 dB abov d signal power when the undesired signal is VOR.
3.6.8.2.2.6.3 Third and beyond adjacent 25 kHz channels (±75 kHz or mo he VHF data broadcast receiver shall
meet the requirements specified in 3.6.8.2.2.3 in the presence of a transmitted undesired signal offset by 75 kHz or more on
either side of the desired channel that is either:
in the signal strength of horizontally and vertically polarized components of the broadcast signal, the total aircraft
implementation loss is limited to 15 dB for horizontally polarized receiving antennas and 11 dB for vertically polarized
receiving antennas.
3.6.8.2.2.3 for all Type 1, 2 and 4 messages fro
the presence of other GBAS transmissi
b essages with different SSIDs.
3.6.8.2.2.4.1 Decoding of Type 101 messages. A VHF data broadcast receiver capable of receiving Type 101 messages,
shall meet the
re
indicated in 3.6.8.2.2.5.1 b).
fied in 3.6.8.2.2.3 in the F da
o the same time slot(s) and 26 dB a broadcast
ifferent time slot eiver
VOR as the undesired signal. The r shall
resence of
channel rejection
st adjacent 25 kHz channels (±25 kHz). The VHF data broadcast receiver shall me
in the presence of a transmitted undesired signal offset by 25 kHz on either side of th
he desired signal power when t
djacent 25 kHz channels (±50 kHz). The VHF data broadca
er V
me slot(s); or
e the desire
re). T
APP B-115 23/11/06
Annex 10 — Aeronautical Communications Volume I
a) 46 dB above the desired signal power when the undesired dcast signal assigned to
the same ti or
b) 46 dB abov
3.6.8.2.2.7 Re ith no on-channel
data broadcast signal present, the VHF data broadcast receiver shall not output data from an undesired VHF data
roadcast signal on any other assignable channel.
3.6.8.2.2.8 Rejection of signals from sources outside the 108.000 – 117.975 MHz band
3.6.8.2.2.8.2 Desensitization. The VHF data broadcast receiver shall meet the requirements specified in 3.6.8.2.2.3 in
the presence of VHF FM broadcast signals with signal levels shown in Tables B-80 and B-81.
3.6.8.2.2.8.3 VHF dat st receiver shall meet the
requirements specified in 3.6 ntermodulation products of
two VHF FM broadcast signals having levels in accordance with the following:
2N1 + N2 + 72 ≤ 0
for VHF FM soun the range 107.7 – 108.0 MHz an
signal is another VHF data broa
me slot(s);
e the desired signal power when the undesired signal is VOR.
jection of off-channel signals from sources inside the 108.000 – 117.975 MHz band. W
　
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