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1 1.3.1.6 TRANSMITER STABILITY
The basic frequency stability of the transmitting function shall
be such that the difference between the actual carrier of the
PSK transmission and the SSB assigned frequency shall not
exceed:
a) 20 FKz for W Lai rcraft station sub-systems: and
b) 10 Hz for HFDL ground station sub-systems.
Note.- When fi1 eeyuuls !he rulrde 2, the dntn rate nzny he 11.3.1.7 RECEIVER STAl3ILITY
300 or 600 bits per secotld as determined by the ch~rllncl
c.oiii,7,rTat e. 3.1re volrre qf ,w ,nLIy cirungc frum one The basic frequency stability of the receiving function shall bc
tm,lsm,ss~olLto a,lot/rer d epu,lr l;,zg lhe data rare seit.crrd, SUCII that. u7ith the transmitting function stxhility spccilied in
T / c~han~ne l rodi,rg rare is described iTLt he ~~~~~l on HF 1 1.3.1.6. the over-all frequency diffe~cnccb ciween ground and
Data Idink (Doc 9741). airborne functions achievcd in scrvicc docs not exceed 711 Hz.
11.3.1.5.1 M-PSK C4RRfER
The M-PSK carrier expressed mathematically shall be defined
as:
N = number of M-PSK symbols in transmitted
physical layer protocol data unit (PPDU)
s(t) = analog wavcform or signal at timc t
A = peak amplitude
f~ = SSB carrier (reference) i 1 440 Hz
T = M-PSK symbol pcriod (111 800 s)
cp(k) = phase of kth M-PSK symbol
p(t-kT) = pulse shapc of krh AM-PSR svmbol at time t.
11.3.1.8 PROTECTION
A 15 tlJ3 desired to imdesired (DAJ) signal ratio shall apply for
the protcction of co-channel assignments for HFDL as follows:
a) data versus data;
b) data versus voicc; m(l
c) voice versus data.
1 1.3.1.9 CLASS OF EMISSION
The class of emission shall be 2K80J2DEK.
Nore.- Tlze nrllnher of M-PSK s!mbols sent, N, defirtes the 11.3.1.10 ASSIGNED FREQUENCY
length (dr~rurion = NT seconds) of the PPDII. Tl~ese
Panmeters are defit7ed rile Manual on HF Data Link Thc FIFDL assigned frequency shall be 1 400 Hz highcr than
(Doc 9741). the SSB carrier (reference) frequency.
1 1.3.1.5.2 PL~LSSEH APE 1'Vote.- The HFC)L ~rssignerl, freqzre~zci~s offset fronl the
SSB carrier (rqfererice) f~cquency h! 1 400. The digiml
The p~llse shapc. pit), shall determine the spectral distribution nrodrrlalion is JI'ull!. conraineif vvithir! the snnle over-all c17annei
:)I' thc trmsmictcrl signal. The Fourier transform of the pulse. bundtvidrll as rhe voice signal nnrl complies tipith the
shap:, P ( 0 , shall bc ilcl3ned by: pro~isicms of Appendix S27 to ?he IFU Radio Regirlations.
For HFDL aircraft and ground station transmitters. {he peak
envelope power (Pp) of any :mission on any discrete frequency
shall he less Lhan the peak envelope power (Pp) of the
transmitter in accordance with t h f~ol lowing (scc Figure 11-1 ):
a) on any frequency between 1.5 H z and 4.5 H-lz lower
than the HFDL assigncd frequcncy, and on any
frequency I~etween 1.5 kHz and 4.5 H z 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 frequcncy, and on any
frrcl~~encbye lwccn 1.5 kHz and 7.5 kHz higher than the
HFDL assigned Srcquency: at least 35 dB: and
o) on any frequency lower than 7.5 kHz bclow thc HFDL
assigncd frequency and on any trequency h~gher Lhan
7.5 kHz abovc (he I-IFDL assigned frequency:
1) HFDL aircraft station transmitters: 43 dB:
2) HFDL ground station transmitters up to and
including 50 W:
3) HFDL ground station lransmiltcrs more than 50 W:
60 dB.
Figure 11-1. Required spectrum limits (in terms of peak power)
for HFDL aircraft and ground station transmitters
338C
HFDL
assigned
frequency
I '
-I--:----
I 1
I I
I 1
I '
1 I 400 1
I I
I I
I '
1.5 1 1.5
kHz
-30 dB
41 1 1199
No. 71
I I
I '
I '
4 b
-38 dB
4 7.5 I I 7.5
kHz kHz b *
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 - tlero~iai~ticaTle I~cornmunications Vulumc 111
11.3.1.12.1 Grolrnd station installations. The peak
envelo~ep ower (Pp)s upphcd to the antenna transmission line
shall not exccecl a maxllnum value of 6 kW as providecl for in
Appendix S27 of thc Rad~oR egulations.
11.3.1.12.2 Aircrajt station installutions. The peak
envelope power supplied to the antenna transmission line shall
not excccd 400 W. except as provided for in Appcndix S27162
of the Ratlio Regula~ions.
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