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possible, the G/T should be not less than -13 dB/K and the
arid 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 functions 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
pattern for both transmit and receive functions should discriminate
by not less than. 13 dB between the directions of
wanted and unwanted satellires spaced 45 degrees or greater
in longitude over 100 per cent of the reference coverage
volume defied in 4.2.3.1.1.
Annex 10 - Aeronautical Telecommunications Volume I l l
4.2.3.3.5 Phase discontinuiry. Beam steering transitions 4.2.3.5.1.2 Far high gain antenna operation, the
between adjacent beam positions of a switched beam antenna minimum value of EIRP per carrier in the direction of the
shall not cause RF phase transitions greater than 12 degrees in satellite, when commanded to the maximum setting, shall be
the transmitted signal for 99 per cent of all possible adjacent 25.5 dBW. The EIRP radiated in any direction shall not
beam combinations. exceed 34.8 dBW at the maximum setting.
4.2.3.3.5.1 Recomme~dation.- Beam steerkg tran,sitions
between adjacent beam positions af 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
performance in the case of multiple array antennas.
4.2.3.4 RECEIVER
REQUIREMENTS
4.2.3.4.1 Receiver spurious and lineariv pe$ornuznce.
The required performance defined in 4.4.2.3 and 4.4.5.4 shall
be achieved when the receiving antenna is illuminated in the
direction of maximum gain by a power Aux density of -100
dBW/m2 distributed across the 1 525 to 1 559 MHz band.
4.2.3.5.1.3 At settings less than the maximum setting,
the EIRP per carrier radiated in any direction shall not exceed
the EIRP radiated toward the wanted satellite by more than
5 dB.
4.2.3.5.1.4 For multicanier operation, the maximum
allowable operating EIRP shall be the level at which:
a) the total in~emodulation product contribution from
active sources is the maximum permitted in 4.2.3.5.7
(in-band intermodulation products), or
b) the gain-to-noise temperature ratio is the minimum
permitted in 4.2.3.2.1 or 4.2.3.3.1, as applicable.
4.2.3.5.2 EIRP control. The EIRP per carrier in the
direction of the wanted satellite shall be adjustable over a
range of 15 dB in steps of I dB by command from the GES.
4.2.3.5.3 Recommendation.- The minimum EIRP gf 4.2.3.4.2 Receiver out-of-ban,d per$ormance. The
the power control range should be a function of the channel
required performance defined in 4.4.2.3 and 4.4.5.4 shall be
achieved in the presence of out-of-band interference at levels rate and the beam to minimize the
in.terference potential.
typical of normal operating conditions.
4.2.3.5.4 Carrier-ofS level. The EIRP in any direction,
4.2.3.4.3 Received phase noise. The design of the
summed across the 1 626.5 to 1 660.5 MHz band, when all
receiver and the derndulators shall be such as to ensure full carriers are commanded off shall be -24.5 dBW or less.
compliance with the performance requirements whenever the
received signal phase noise characteristic does not exceed the
mask defined in Table 4- 1 .* 4.2.3.5.5 Log-on EIW. When logging on to a GES, the
EIRP of the AES shall be at least 13.5 dBW.
4.2.3.4.4 Capture range. The receiver shall be capable 4.2.3.5.6 In-bad spurious EIRP. When transmitting a
of acquiring and maintaining lock to signals with a frequency
modulated carrier at any level up to the maximum allowable
offset from nominal of up to k2.180 kHz at carrier-to-noise operating E m , che composite radiated in-band spurious and
levels as shown in Table 4-2. noise EIRP (excluding intermodulation products) referenced to
4.2.3.4.5 Receiver Doppler rate. The receiver shall be
a 4 kHz band shall not exceed -55 d ~ c~. h rkequ irement
shall not apply to the frequency band on either side of the
capable of acquiring and maintaining performance per 4.3.3 carrier centre frequency which is described in 4.3.2.1.
with a rate of change of frequency of 30 Hz per second.
4.2.3.5 TRANSMITTER
REQUIREMENTS
4.2.3.5.1 EIRP u~lrs
4.2.3.5.7 In-band intermodulation products. For a
multicamer AES, the EIRP of each in-band intermodulation
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