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shape, P(0, shall be defined by:
The HFDL assigned fiequency shall be 1 400 Hz higher than
the SSB canier (reference) frequency.
Note.- By convention, the HFDL assigned frequency is ofset
from the SSB carrier (reference) frequency by 1 400 Hz.
The HFDL M-PSK carrier of the digital modulation is offset
from the SSB cam'er (reference) freguency by 1 440 Hz. The
digital modulation is fully contained within the same overall
channel bandwidth as the voice signal and complies with the
provisions of Appendix 27 to the ITU Radio Regulations.
2511 YM
No. 79
Part I Annex 10 - Aeronautical Telecommunications
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 kHz 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;
frequency between 4.5 kHz and 7.5 kHz higher than the
HFDL assigned frequency: at least 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 Pp(W)] dB; and
b) on any frequency between 4.5 kHz and 7.5 kHz lower 3) HFDL ground station transmitters more than 50 W:
than the HFDL assigned frequency, and on any 60 dB.
HFDL
assigned
frequency
I I
Figure 11-1. Required spectrum limits (in terms of peak power)
for HFDL aircraft and ground station transmitters
-i--,:----
I I
I I
I I
I I
11 4001
GI I
I I
I I
1.5 1 1.5
I kHz I kHz
+?-
25111lM
No. 79
0 dB
-30dB
I I
I ;
4 4.5 I I 4.5
kHz i "? kHz b
-38 dB
7.5 I I 7.5 ,
kHz IkHz *
SSB carrier a) aircraft station transmitters: -43 dB
(reference) b) aeronautical station transmitters:
frequency for transmitter power up to and including 50 W:
- [43 + 10 log P, (W)] dB
for transmitter power more than 50 W, the
attenuation shall be at least 60 dB.
Annex I0 - Aeronautical Telecommunications Volume IZI
1 1.3.1.12.1 Ground station installations. The peak
envelope power (Pp) supplied to the antenna transmission line
shall not exceed a maximum value of 6 kW as provided for in
Appendix 27 of the Radio Regulations.
1 1.3.1 .I 2.2 Aircrafi station installations. The peak
envelope power supplied to the antenna transmission line shall
not exceed 400 W, except as provided for in Appendix 27/62
of the Radio Regulations.
11.3.1.13 UNDESIRED SIGNAL REJECTION
by the link layer. The physical layer shall perform transmitter
keying on demand fiom the link layer to transmit a packet.
1 1.3.2.2.1 7kANSMITER TO RECEIVER TURNAROUND TIME
The transmitted power level shall decay at least by 10 dB
within 1 00 milliseconds after completing a transmission. An
HFDL station sub-system shall be capable of receiving and
demodulating, with nominal performance, an incoming signal
within 200 milliseconds of the start of the subsequent receive
slot.
1 1.3.2.2.2 RECEIVER TO TRANSMITER 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
following: power within plus or minus 1 dB to the antenna transmission
line within 200 milliseconds of the start of the transmit slot.
a) on any kequency between fc and (f, - 300 Hz), or
between (f, + 2 900 Hz) and (fc + 3 300 Hz): at least
35 dB below the peak of the desired signal level; and 1 1.3.2.3 TRANSMISSIOONF DATA
b) on any frequency below (f, - 300 Hz), or above (fc + Transmission of data shall be accomplished using a time
3 300 Hz): 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 fiame
and slot synchronization for the HFDL system. To ensure that
where fc is the cam'er (reference) frequency. slot synchronization is maintained, each HF data link
modulator shall begin outputting a pre-key segment at the
beginning of a time slot plus or minus 10 milliseconds.
1 1.3.1 .14 RECEIVER RESPONSE TO TRANSIENTS
Recommendation.- The receiving function should 11.3.2.3.1 TDMA STRUCTURE
recover from an instantaneous increase in RF power at the
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