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defined in 4.2.3.1.1; and not less than -3 1 dB/K over the
remaining 15 per cent of the reference coverage volume. The
only exception to this is the region greater than 70 degrees in
elevation from the horizontal plane where the GTT shall be not
less than -28 dB/K.
4.2.3.3.2 Axial ratio. The axial ratio shall be less than
6 dB over the 75 per cent of the reference coverage volume
referred to in 4.2.3.3.1 where the G/T must exceed -13 &/K
or the AES antenna shall have sufficient gain to compensate
Ibr additional polarization loss in excess of that caused by this
axial ratio. The condition for including the compensation shall
assume the satellite axial ratio to be 2.5 dB, with the major
axes of the polarization ellipses orthogonal.
4.2.3.3.3 Recommendation.- To the mnxin~um extent
possible, the G/T should be not less than -13 dB/K and the
axial ratio should be less than 6 dB over 100 per cent of the
reference coverage volume.
4.2.3,3.4 Discrimination. The antenna gain pattern for
both transmit and receive fnnctions shall discriminate by not
less than 13 dB between the directions of wanted and
unwanted satellites spaced 45 degrees or greater in longitude
over not less than 75 per cent of the reference coverage volume
defined in 4.2.3.1.1.
4.2.3.3.4.1 Recommendation.- The antenna gain
puttern for both trurzsnzit and receive functions should
discriminate by not less than 13 dB between the directions of
wanted and unwanted sutellites spaced 45 degrees or greater
irz longitude over 100 per cent of the reference coverage
volzime defined in 4.2.3.1.1.
lllllUl
No. 76
Annex 10 - Aeronautical Telecommunications Volume Ill
4.2.3.3.5 Plzase discontilzuity. Beam steering transitions
between adjacent beam positions of a switched beam antenna
shall not cause RF phase transitions greater than 12 degrees in
the transmitted signal for 99 per cent of all possible adjacent
beam combinations.
4.2.3.3.5.1 Recommendation.- Beam steering transitions
between adjacent beam positions of a switched beam
antenna should not cause RF phase transitions greater than
12 degrees in the transmitted signal for 100 per cent of all
possible adjacent beam combinations.
Note.- This requirement only applies to individual array
perjfomance in the case of multiple array antennas.
4.2.3.4 RECEIVER
REQUIREMENTS
4.2.3.4.1 Receiver spurious and linearity perjformance.
The required performance defined in 4.4.2.3 and 4.4.5.4
shall be achieved when the receiving antenna is i1,luminated
in the direction of maximum gain by a power flux density of
-100 dJ3w/m2 distributed across the 1525 to 1559 MHz
band.
4.2.3.4.2 Receiver out-of-band pe~omanceT. he required
performance dchned in 4.4.2.3 and 4.4.5.4 shall be achieved in
the presence of out-of-band interference at levels typical of
normal operating conditions.
12.5 d13W. The ElRP radiated in any direction shall not exceed
34.8 dBW at the maximum setting.
4.2.3.5.1.2 For high gain antenna operation, the minimum
value of EKP per carrier in the direction of the satellite, when
commanded lo the maximum setting, shall be 25.5 dBW. The
EIRP radiated in any direction shall not exceed 34.8 dBW at
the maximum setting.
4.2.3.5.1.3 At settings less than the maximum setting, the
EIRP per carrier radiated in any direction shall not exceed the
ElRP radiated toward the wanted satellite by more than 5 d3.
4.2.3.5.1.4 For multicarrier operation, the maximum
allowable operating EKE' shall be the level at which:
a) the total intermodulation product contribution from
active sources is the maximum permitted in 4.2.3.5.7
(in-band jntermodulation products), or
b) the gain-to-noise temperature ratio is the minimum
pennitled in 4.2.3.2.1 or 4.2.3.3.1, as applicable.
4.2.3.5.2 EIRP, contml. The ELRP per carrier in the
direction of the wanted satellite shall be adjustable over a
range of 15 dB in steps of 1 dB by command from the GES.
4.2.3.5.3 Recommendation.- The minimum EIRP of the
power contml range should be afunction of the channel rate
and the satellite beam characteristics to nzinimize the
4.2.3.4.3 Received phase noise. The design of the receiver intetj%ence potential.
and the demodulators shall be such as to ensure full
compliance with the performance requirements whenever the 4.2.3.5.4 Carrier-off level. The EIRP in any direction,
received signal phase noise characteristic does not exceed the summed across the 1 626.5 to 1 660.5 MHz band, when all
mask defined in Table 4- I.* carriers are commanded off shall be -24.5 dBW or less.
4.2.3.4.4 Capture range. The receiver shall be capable of
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