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VHF
b
3.6.8.2.2.8.1 VHF data broadcast interference immunity. The VHF data broadcast receiver shall meet the requirements
specified in 3.6.8.2.2.3 in the presence of one or more signals having the frequency and total interference levels specified in
Table B-79.
a broadcast FM intermodulation immunity. The VHF data broadca
.8.2.2.3 in the presence of interference from two-signal, third-order i
d broadcasting signals in d
1 2
2N N 3 24 20 log f 0
0.4
+ + ⎛⎜ − Δ ⎞⎟≤
⎝ ⎠
below 107.7 MHz
for VHF FM sound broadcasting signals
where the frequencies VHF FM sound broadcasting signals produce, within the receiver, a two signal, third-order
termodulation product on the desired VDB frequency.
1 and N2 are the levels (dBm) of the two VHF FM sound broadcasting signals at the VHF data broadcast receiver input.
und broadcasting signal closer to 108.1 MHz.
ata broadcast channel operating
below 108.1 MHz, hence frequencies below 108.1 MHz are not intended for general assignments. Additional information is
en verified.
3.6.8.3.1.3 The receiver shall use only ranging source measurement blocks with matching modified Z-counts.
of the two
in
N
Neither level shall exceed the desensitization criteria set forth in 3.6.8.2.2.8.2.
Δf = 108.1 – f1, where f1 is the frequency of N1, the VHF FM so
Note.— The FM intermodulation immunity requirements are not applied to a VHF d
provided in Attachment D, 7.2.1.2.
3.6.8.3 AIRCRAFT FUNCTIONAL REQUIREMENTS
3.6.8.3.1 Conditions for use of data
3.6.8.3.1.1 The receiver shall use data from a GBAS message only if the CRC of that message has be
3.6.8.3.1.2 The receiver shall use message data only if the message block identifier is set to the bit pattern
“1010 1010”.
23/11/06 APP B-116
Appendix B Annex 10 — Aeronautical Communications
Table B-79. Maximum levels of undesired signals
Frequency the receiver input (dBm)
Maximum level of undesired signals at
50 kHz up to 88 MHz –13
108.000 MHz – 117.975 MHz excluded
18.050 MHz up to 1 660.5 MHz –13
Notes.—
ship is linear between single adjacent points designated by the above frequencies.
2. These interference immunity requirements may not be adequate to ensure compatibility between VHF
vertically polarized component of the VHF data broadcast. Without coordination between COM and
have to be implemented. The final compatibility will have to be assured when
equipment is installed on the aircraft.
88 MHz – 107.900 MHz (see 3.6.8.2.2.8.2)
118.000 MHz –44
118.025 MHz –41
1
1. The relation
data broadcast receivers and VHF communication systems, particularly for aircraft that use the
NAV frequencies assignments or respect of a guard band at the top end of the 112 – 117.975 MHz
band, the maximum levels quoted at the lowest COM VHF channels (118.000, 118.00833, 118.01666,
118.025, 118.03333, 118.04166, 118.05) may be exceeded at the input of the VDB receivers. In that
case, some means to attenuate the COM signals at the input of the VDB receivers (e.g. antenna
separation) will
Table B-80. Desensitization frequency and power requirements
that apply for VDB frequencies from 108.025 to 111.975 MHz
Maximum level of undesired signals
Frequency at the receiver input (dBm)
88 MHz ≤ f ≤ 102 MHz 15
106 MHz 5
107.9 MHz –10
104 MHz 10
Notes.—
1. The relationship is linear between single adjacent points designated by the above frequencies.
2. This desensitization requirement is not applied for FM carriers above 107.7 MHz and VDB
channels at 108.025 or 108.050 MHz. See Attachment D, 7.2.1.2.2.
max is broadcast by the ground subsystem, the receiver shall only apply pseudo-range corrections when
th AS reference point is less than Dmax.
3.6.8.3.1.5 The receiver shall only apply pseudo-range corrections from the most recently received set of corrections
for a given measurement type. If the number of measurement fields in the most recently received Type 1 or Type 101
essage indicates that there are no measurement blocks, then the receiver shall not apply GBAS corrections for that
easurement type.
3.6.8.3.1.6 The receiver shall exclude from the differential navigation solution any ranging sources for which σpr_gnd is
set to the bit pattern “1111 1111”.
3.6.8.3.1.4 If D
e distance to the GB
mm
APP B-117 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table B-81. Desensitization frequency and power requirements
that apply for VDB frequencies from 112.000 to 117.975 MHz
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