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acquiring and maintaining lock to signals with a frequency
offset from nominal of up to k2.180 kHz at carrier-to-noise
levels as shown in Table 4-2.
4.2.3.4.5 Receiver Doppler rate. The receiver shall be
capable of acquiring and maintaining performance per 4.3.3
with a rate of change of frequency of 30 Hz pcr second.
4.2.3.5.5 Log-on EKRP When logging on to a GES, the
EIRP of the AES shall be at least 12.5 dBW.
4.2.3.5.6 In-band spurious EIRP When transmitting :a
modulated carrier at any level up to the maximum allowable
operating EIRF', the composite radiated in-band spurious and
noise EIRP (excluding intermodulation products) referenced to
a 4 kHz band shall not exceed -55 dBc. This requirement shall
not apply to the frequency band on either side of the carrier
centre frequency which is described in 4.3.2.1.
4.2.3.5 TRANSMITTER
REQUIREMENTS
4.2.3.5.1 EIRP WhfITS
4.2.3.5.1.1 For low gain antenna operation, the minimum
value of ElRP per carrier in the direction of the satellite, when
commanded to the maximum setting, shall be 13.5 dBW. The
EIRP radiated in any direction shall not exceed 22.8 dBW.
4.2.3.5.1.1 bis For intermediate gain antenna operation,
the minimum value of EKP per carrier in the direction of the
satellite, when commanded to the maximum setting, shall be
4.2.3.5.7.1 For muldcarrier AES, the radiated intermodulation
products shall not cause harmhl interference to
satellite navigation receiver operation where such receiver is
operated on the same aircraft when transmitting two equal
carriers with a total power equal to the maximum allowable
operating EIRP of the AES.
* All tables are located at the end of this chapter.
2/11/00
No. 75
Part Z Annex I0 - Aeronautical Telecornll~unications
4.2.3.5.7.2 The AES transceiver shall not transmit on a
newly assigned frequency that would produce a fifth-order
intermodulation product at a frequency below 1 610.0 MHz.
4.2.3.5.7.3 Frequency management techniques shall be
used to preclude 5th and lower order intermodulation products
below 1 61 0 MHz being radiated by the AES.
4.2.3.5.8 Out-of-band EIRP density levels. When
transmitting a carrier at any level up to the maximum power
level as described in 4.2.3.5.1, the out-of-band EIRP including
spurious, harmonics and noise generated by the AES in any
direction shall not exceed the levels shown in Table 4-3.
4.2.3.6.4 Discrimination. The antenna gain pattern for
both transmit and receive functions shall discriminate by not
less than 7 dB between the directions of wanted and unwanted
satellites spaced 80 degrees or grcatcr in longitude over not
less than 85 per cent of the reference coverage volume defined
in 4.2.3.1.1.
4.2.3.6.5 Recommendation.- The antenna gain pattern
for both transmit and receive functions should discriminate by
not less than 7 dB between the directions of wanted and
unwanted satellites spaced 80 degrees or greater in longitude
over 100 per cent of the reference coverage volume defined
in 4.2.3.1.1.
4.2.3.5.8.1 Recommendation.- The EIRP density 4.2.3.6.6 Phase discontinuity. Beam steering transitions
should not exceed -140 dBc/l MHz fmm 1 605 to 1 610 MHz. between adjacent beam positions of a switched beam antenna
shall not cause RF phase transitions greater than 30 degrees in
4.2.3.5.9 Phase noise. The phase noise induced on a the phase of the receive and transmit signal for 99 per cent of
modulated carrier shall have a power spectral density not all possible adjacent beam combinations.
exceeding the envelope defined in Table 4-4.
4.2.3.6.7 Recommendation.- Beam steering transitions
4.2.3.5.10 Transmitter Doppler rate. The maximum rate between adjacent beam positions of a switched beam antenna
of change of the frequency of the transmitted signal when should not cause RF phase transitions greater than 30 degrees
compensated for aircraft acceleration in the direction of the in the received and transmitted signal for 100 per cent of all
satellite shall not exceed 15 Hz per second. The Doppler possible adjacent beam combinations.
adjustment resolution shall not exceed 10 Hz and the
associated frequency changes shall be made without
introducing phase discontinuity into the transmitted signal.
4.2.3.5.11 AMSS transmissions shall not cause harmful
interference to satellite navigation receiver operation where
4.3 Kl? CHANNEL
CHARACTERISTICS
such receiver is operated on the same aircraft as the AES.
4.3.1 Modulation
4.2.3.6 INTERMEDIATE GAIN ANTENNA
SUB-SYSTEMS
4.2.3.6.1 Gain-to-noise temperature ratio. Receiving
sub-systems employing intermediate gain antennas shall
　
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