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Note.- See ITU Radio Regulations, Article 8, No. 729A.
4.2.1.2.1 The aircraft earth station shall be capable of
receiving in the frequency band 1 544 to 1 555 MHz.
Note.- Use of the band 1 544 to 1 545 MHz by mobile
satellite services is limited to distress and safety operations.
4.2.1.2.2 Recommendation.- The aircrafr earth station
shorild be capable of receiving in the frequency band 1 555 to
1 559 MHz.
Note.- The band 1 555 to 1 559 MHz may be protected and
utilized hy some States for national and international AMS(R)S
purposes.
4.2.1.2.3 Recommendation.- The aircrafl earth station
should also be capable of receiving in the frequency band
1 525 to 1 544 MHz.
Note.- The band 1 525 to 1 544 MHz may be used to
communicate for purposes of distress and public
correspondence with stations of the maritime mobile-satellite
service in accordance wirh No. 3571 of the ITU Radio
Regulations.
4.2.1.3.1 The aircraft eadh seaeion shall be capable of
transmitting in the frequency band 1 645.5 to 1 656.5 MHz.
Note.- Use of the band 1 645.5 to 1 646.5 MHz by mobilesatellite
services is limited to distress and safety operations.
4.2.1.3.2 Recommendation.- The aircraft earth station
should be capable of transmitting in the frequency band
1 656.5 to 1 660.5 MHz.
Note.- The band I 656.5 to 1 660.5 MHz m y be protected
and utilized by some States for national and international
AMS(R)S purposes.
4.2.1.3.3 Recommendation.- The aircraj? earth station
should also be capable of transmitting in the frequency band
1 626.5 to 1 645.5 MHz.
Note.-- The band 1 626.5 to .l 645.5 MHz rnay be used m
communicate for purposes of distress and public
correspondence wirh stations of the maritime mobile-satellite
service in accordance with No. 3571 of the ITU Radio
Regulations.
4.2.1.4 TUNING INCREMENTS
4.2.1.4.1 Channels shall be allocated throughout the
bands in increments of 2.5 kHz, for the to- and from-aircraft
transmission path.
4.2.1.4.2 Channel assignment and tuning of the aircraft
earth station shall be achieved under control from the GES.
4.2.1.5.1 The channel number (Ct) shall be defined with
respect to the centre frequency on the to-aircraft transmission
path by the formula:
frequency of transmission (MHz) - 1 510.0
Ct = -
0.0025
4.2.1.5.2 The channel number (Cf) shall be defined with
respect to the centre frequency on the from-aircraft
transmission path by the formula:
frequency of transmission (MHz) - 1 611.5
Cf - -
0.0025
4.2.2 Frequency accuracy
The frequency of transmission from the aircraft earth station,
as would be received at the satellite, shall not vary from the
nominal channel frequency by more than 4383 Hz due to all
causesPart
I Amex 10 - Aeronautical Telecommunications
Note.- The jiequency of transmissions received by a
submrtic aircraft should not vaql from' the nominal chrutnel
,frequency by more than +2.18 kHz due to all causes.
4.2.3 Aircraft earth stations
RF characteristics
Note.- The following requirements apply over the entire
transmit and receive frequency bands.
4.2.3.1 GENERALA NTENNA
CHARACTERISTICS
4.2.3.1.1 Reference coverage volume. Antenna systems
shall be installed to meet performance requirements for
transmitting and receiving over a coverage volume of 360 degrees
of azimuth and from 5 to 90 degrees in elevation from a
horizontal plane for aircraft in straight and level flight.
4.2.3.1.1.1 Recommendation.- To the maximum extent
possible, antenna systems should be installed to meet
performance requirements for transmitting and receiving over
a coverage volume of 360 degrees in azimuth and from 5 to 90
degrees in elevation fmm a horizontal plane for lrircraft
attitudes of +20/-5 degrees of pitch and e25 degrees of roll.
4.2.3.1.2 Polarization. The polarization shall be righthand
circular for both receiving and. transmitting, in
accordance with the definition of CCR Recommendation 573.
4.2.3.1.3 Antenna switching. Aircraft earth stations that
require more than one antenna shall be capable of switching
from one antenna to another in the same antenna sub-system
so as to introduce a signal interruption of not more than 40 ms.
Note.- 4.2.3.2, 4.2.3.2bis and 4.2.3.3 outline the
requirements for high gain, intermediate gain and low gain
antennas only. This does not preclude the furure introduction
of other gain antennas; however; some of the considerations
which must be made before such an introduction are described
in the guidance material contained in Attachment A to Part I
of Annex 10, Volume 111.
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