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6 F A ZAZZA Z
7 G A AZAZZ Z
8 H A AAZAZ Z
9 I 8 A AZZAA Z
10 J Attention signal A ZZAZA Z
11 K ( A ZZZZA Z
12 L A AZAAZ Z
13 M A AAZZZ Z
14 N A AAZZA Z
15 0 G A AAAZZ Z
16 P 0 A AZZAZ Z
17 Q 1 A ZZZAZ Z
18 R 4 A AZAZA Z
19 S A ZAZAA Z
20 T 5 A AAAAZ Z
2 1 U 7 A ZZZAA Z
22 V -- A AZZZZ Z
23 W 2 A ZZAAZ Z
24 X I A 2.4222 Z
25 Y 6 A ZAZAZ Z
26 Z + A ZAAAZ Z
27 carriage return A AAAZA Z
28 line feed A AZAAA Z
29 letters A ZZZZZ Z
30 figures A ZZAZZ Z
3 1 space A AAZAA Z
32 unperforated tape A AAAAA Z
33 signal repetition
3 4 signal
35 signal p
lktter
case
711 1/96
No. 71
Figure
case
Impulses
5-unit code
Szart 12345 I Stop
Part I Annex 10 - Aeronautical Telecommunications
8.2.6 Recommendation.- In start-stop apparatus fitted Note.- FIB type of modulation is accomplished by
with automatic. time delay switches, the discortnection of the shifting a radio jkequency carrier between two frequencies
power srlpply to the motor should not take place before the representing "position A " (start signal polarity) and "position
lapse of at least 45 seconds after the reception of the last 2'' (stop signal polarity) of the start-stop 5-unit telegraphic
signal. code.
8.2.7 Recomn1endation.- Arrangements should he
made ro avoid the mutilution of signals transmitted at the head
of a message and received on start-stop reperjiorating
8.3.2 System characteristics
apparatus. 8.3.2.1 Recommendation.- The characteristics of
signals fram radioteletypewriter transmitters utilizing FIB
8.2.7.1 Recommendation.- I f the repelforating appa- modulation should be as follows:
ratus is provided with local means for feeding the paper, not
nzore than one mutilated signal should be tolerated.
a) Frequency shift: the lowest possible value.
8.2.8 Recommendation.- Complete circuits should be
so engineered and maintained that their degree of standard- b) Frequency shift tolerance: within plus or minus 3 per
ized test distortion does not exceed 28 per cent on the cent of the nominal value of the frequency shift.
standardized text:
THE QUICK BROWN FOX JUMPS
OVER THE LAZY DOG
VOYEZ LE BRICK GEANT QUE
JEXAMINE PRES DU WHARF
c) Polarity: single channel circuits: the higher frequency
corresponds to "position A " (start signal polarity).
8.3.2.2 Recommendation.- The variation of the mean
between the radio frequencies representing respectively
"position A" and '>osition Z" should not exceed 100 Hz
during any two-hour period.
8.2.9 Recommendation.- The degree of isochronous 8.3.2.3 Recommendation.- The over-all distortion of
distortion orz the standardized text of each of the parts of a the teletypewriter signal, as monitored at the oilput of the
complete circuit should be as low as possible, and in any case radio transmitter or in its immediate vicinity, should not
should not exceed 10 per cent. exceed I0 per cent.
8.2.1.0 Recommendation.- The over-all distortion in Note.- Such distortion means the displacement in time of
transmitting equipment used on teletypewriter channels should the transitions between elemenrs j-om their proper positions,
not exceed 5 per cent. expressed as a percentage of unit element time.
82.11 Recommendation.- AFTN circuits should be 8.3.2.4 Recommendation.- Radioteletypewriter
equipped with a JYstem of Contln~lous check of chant~el receivers concerned with FIB modulation should be capable
condition. Additionally, controlled circuit protocol,^ should be ofoperating on having t/lec haracteris~ics
applied. set out in 8.3.2.1 and 8.3.2.2 above.
8.3.2.5 Recommendation.- The characteristics of
8.3 TERMINAL EQUIPMENT ASSOCIATED multichannel transmission of teletypewriter signals over a
radio circuit should be established by agreement between the WITH AERONAUTICAL RADIOTELETYPEWRITER concerned.
CHANNELS OPERATING IN THE BAND
2.5 - 30 MHZ
8.3.1 Selection of type of
modulation and code
8.4 CHARACTERISTICS OF
INTERREGIONAL AFS CIRCUITS
8.3 -1 .1 Recommendation, Frequetlcy shift modulatio~z 8.4.1 Recommendation.- Interregional A FS circuits
(FIB) should be enzployed in radioteletypewriter systerns used being implemented or upgraded should employ high quality
in the aeronautical jixed service (AH), except where the telecommunications service. Modulation rate shoilld take into
characteristics of the independe~zts ideband (ISB) method of accou~zt trafJic volumes expected under hollz nonnal and
operation are of advantage. alternate route co~iditions.
Annex 10 - Aeronautical Telecommunications Volume 111
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