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(24 BITS)
37 40
Note I.- I0 bits, all Os or NationaI use.
74 83
T C SEE NOTE 2
T
37 40
Nore 2.- COSPAS-SARSAT Type Approval Certificate number in binury notation with the leosr significunt bit on the right, or National
use.
T
0 1
44 61
OPERATOR 3-LmER
Note 3.- Serial number; in binary notation with rhe least signiJTcmt bit on the right, of additional ELTs carried in rhe same aircraft
or default to 0s when only one ELT is carried.
1
0 1 T
40 81 83
AIRCRAIT REGISTRATION MARKING (UP TO
7 ALPHANUMERIC CHARACTERS) (42 BITS)
37
T C
62 73
SERIAL
NUMBER 0-
4096
1 T T
85
0 O O A A
T
74 83
C SEE NOTE 2
0 1
ATTACHMENT A TO PART II. GUIDANCE MAIFEUL
FOR COMMUNICATION SYSTEMS
1. VHF COMMUNICATIONS
1.1.1 The aeronautical radiotelephony services represent
a special case of the application of radiotelephony, in that the
requirement is for the transmission of m e w s in such a way
that fidelity of wave form is of secondary importance,
emphis being u pfid elity of basic intelligence. This means
that it is not necessary to transmit those parts of the wave
form which are solely wncerned with individuality, accent and
emphasis,
1.1.2 The effective acceptance bandwidth for 8.33 kHz
equipment is required to be at least plus and minus 3 462 Hz.
This value oonSidm the general case, i.e, air-to-pnd
transmissions and consists of 2 500 Hz audio bandwidth,
685 Hz for an aircraft transmitter instability of 5 ppm, 137 Hz
for a ground receiver instability of 1 ppm and 140 Hz due ta
Doppler shift (2.2.2.4 and 2.3.2.6 of Part I1 refer).
1.2 Off+& carrier system
The following are examples of offset carrier systems which
meet the requirements of Part 11.2.2.1 .I -1.
a) 2-currier system Carriers should be spaced at plus and
minus 5 kHz. This requires a frequency stability of
plus or minus 2 kHz (15.3 parts per million at
130 MHz).
b) 3-currier system W e r s should be spsced at zero and
plus and minus 7.3 kHz, This requires a fnquency
stability of plus or minus 0.65 kHz (5 prts per million
at 130 MHz).
The following are examples or 4- and 5-carrier systems
which meet the requirements of F%ri II, 2.2.1 .1 .I.
c) #-carrier sysfem. Carriers should b spaced at plus and
minus 25 kHz and plus and minus 7.5 kHz. This
requires a frequency stability of plus or minus 0.5 kHz
(3.8 part$ per million at 130 MHz).
d) 5-carrier system Carriers should be spaced at zero,
plus and minus 4 kHz and plus and minus 8 kHz. A
frequency stability in the order of plus or minus 40 Hz
(0.3 parts per million at 130 MHz) is an achievable
and practicable interpretation of the requirement in this
case.
Note 1.- The crrrrierjiquency spacings refemd to above
am with respect to fhe assigned channel jieq~ttncy.
Note 2.- In aircraft receivers which employ a measurement
of th? received cawier-twtoiw rdi0 to OpEfdte the Wte,
the audio heterodynes caw& by the receptitm #two or mre
of-set carriers can be interpreted as noise and cause the
audio output to be mud even when M adeqwe wanted
signal is pmserrt. In order thrrt the airborn receiving system
can conform with the sensitiviq ncomdatione cmtuined
in Part 11, 2.3.2.2. the design of the receivers may need to
ensuw t hth eir sensitivity is minaairaed at n high level when
receiving of-set carrier t ~ m i s ~ w n sl%e, use of a carrier
level over* is art wdfactory solution to this requi~ment,
bur where it is employed, sehg the over* levd QS low as
possible can ameliorate the P K 0 ) r h
13 Immunity performance of COM
receiving systems in t h-pe of
VHF FM broadcast ite&rence
1.3.1 With reference to the Note of 2.3.3.2 of Part 11,
the immunity performance defined there must be measured
against an agreed measure of derogation of the receiving
system's normal perf-, and in the presence of, and
under standard conditions for the input wanted signal. This is
necessary to ensure that the cheuking d receiving station
equipment m bench test can be performed to a repeatable set
of conditions, and results, and to facilitate their subsequent
approval. An adequate measure of immunity performance may
be obtained by the use of wanted signal of minus 87 dlBm into
the receiving equipment and the signal modulated with a
1 kHz tone at 30 per cent modulation depth. The signattonoise
ratio should not faU below 6 dB when he interfering
signals specified at Part 11,2.3.3.1 and 2.3.3.2 are applied. The
broadcast signds should be selected from frequencies in the
　
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