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rp(k) = phase of kth M-PSK symbol
1 1.3.1.9 CLASS OF EMISSION
The class of emission shall be 2KSOJ2DEN.
p(t-kT) = puke shape of kth M-PSK symbol at time t.
Note.- The number of M-PSK symbols sent, N, de$nes the 1 1.3.1.10 ASSIGNEFDR EQUENCY
length (duration = NT seconds) of the PPDU. These
parameters are defined in the Manual on Detailed Technical The HFDL assigned frequency shall be 1 400 Hz higher than
Specifications for the High Frequency Data Link (HFDL). the SSB carrier (refererice) frequency.
11.3.1.5.2 PULSE SHAPE Note.- The HFDL assigned frequency is @set from the
SSB carrier (reference) frequency by 1400. The digital
The pulse shape, p(t), shall determine the spectral distribution modulation is fully contained within the same over-all channel
of the transmitted signal. The Fourier transform of the pulse bandwidth as the voice signal and complies with the provisions
shape, P(f), shall be defined by: of Appendix S27 to the ITU Radio Regulations.
4111199
No. 74
Annex 10 - Aeronautical Telecommunicatiotas
For HFDL aircraft and ground station transmitters, the peak
envelope power (Pp) of any emission on any discrete frequency
shall be less than the peak envelope power (Pp) of the
transmitter in accordance with the following (see Figure 11-1):
a) on any frequency between 1.5 kHz and 4.5 H z lower
than the HFDL assigned frequency, and on any
frequency between 1.5 kHz and 4.5 kHz higher than the
HFDL assigned frequency: at least 30 dB:
b) on any frequency between 4.5 kHz and 7.5 kHz lower
than the HFDL assigned frequency, and on any
frequency between 4.5 kHz and 7.5 kHz hjgher than the
HFDL assigned frequency: at lcast 38 dB; and
c) on any frequency lower than 7.5 kHz below the HFDL
assigned frequency and on any frequency higher than
7.5 kHz above the HFDL assigned frequency:
1) HFDL aircraft station transmitters: 43 dB;
2) HFDL ground station transmitters up to and
including 50 W:
[43 + 10 loglo P,(W)] dB; and
3) HFDL ground station transmitters more, than 50 W:
60 dB.
Figure 11-1. Required spectrum limits (in terms of peak power)
for HFDL aircraft and ground station transmitters
HFDL
assigned
frequency
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No. 74
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G I I
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- I k1H.5z 1I k1H.5z
I ? - -30dB
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4 4.5
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! I 4.5
kHz 1 y kHz
+
-38 dB
4 7.5 I I 7.5 _ kHz I kHz
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SSB carrier a) aircraft station transmitters: -43 dB
(reference) b) aeronautical station transmitters:
frequency for transmitter power up to and including 50 W:
- [43 + I 0 log P, (W)] dB
for transmitter power more than 50 W, the
attenuation shall be at least 60 dB.
Annex 10 - Aeronautical Telecommunications Volume III
11.3.1.12 POWER by the link layer. The physical layer shall perform transmitter
keying on demand from the link layer to transmit a packet.
11.3.1.12.1 Gmund station installations, The ueak
envelope power (PP) supplied to the antenna transmission line
shall not exceed a maximum value of 6 kW as ~rovidedf or in 1 1.3.2.2.1 ~ N S M I T T E RTO RECEIVER TURNAROUND TIME
Appendix S27 of the Radio Regulations.
The transmitted power level shall decay at least by 10 dB
11.3.1.12.2 ~ i ~sta~tio~n infstaltlati ons. ~h~ peak within 100 milliseconds after completing a transmission. An
envelope power supplied to the antenna transmission line shall HFDL station sub-system shall be capable of receiving and
not exceed 400 W, except as provided for in Appendix 527162 demodulating, with nominal pedormance, an incoming signal
of the Radio Regulations. within 200 milliseconds of the start of the subsequent receive
slot.
1 1.3.1.13 UNDESIRESDIG NAL REJECXION 11 .3.2.2.2 RECEIVERT O TRANSMITTER TURNAROUND TIME
For HFDL aircraft and ground station receivers, undesired
input signals shall be attenuated in accordance with the An HFDL station sub-system shall provide nominal output
power within or minus I dB to he
following: line within 200 milliseconds of the start of the transmit slot.
a) on any frequency between f, and (f, - 300 Hz), or
between (f, + 2 900 Hz) and (f, + 3 300 Hz): at least
35 dB below the peak of the desired signal level; and 11.3.2.3 TRANSMISSIOONF DATA
b) on any frequency below (f, - 300 Hz), or above (f, + Transmission of data shall be accomplished using a time
300 at least 60 dB below the peak of the desired division multiple access (TDMA) technique. The HFDL data
signal level, link ground station sub-systems shall maintain TDMA frame
and slot synchronization for the HFDL system. To ensure that
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