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The following system of designating emission, modulation and
transmission characteristics shall be employed.
|
| (a) |
Emissions are designated according to their classification and their necessary
bandwidth.
|
| (b) |
A minimum of three symbols are used to describe the basic characteristics of
radio waves. Emissions are classified and symbolized according to the
following characteristics: |
| (1) |
First symbol—type of modulation of the main carrier;
|
| (2) |
Second symbol—nature of signal(s) modulating the main carrier;
|
| (3) |
Third symbol—type of information to be transmitted.
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Note: A fourth and fifth symbol are provided for additional
information and are shown in Appendix 6, Part A of the ITU Radio Regulations.
Use of the fourth and fifth symbol is optional. Therefore, the symbols may be
used as described in Appendix 6, but are not required by the Commission |
| (c) |
First symbol—types of modulation of the main carrier:
|
| (1) |
Emission of an unmodulated carrier |
N |
| (2) |
Emission in which the main carrier is amplitude-modulated (including cases
where subcarriers are angle-modulated): |
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—Double sideband |
A
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—Single sideband, full carrier |
H
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—Single sideband, reduced or variable level carrier |
R
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—Single sideband, suppressed carrier |
J
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—Independent sidebands |
B |
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—Vestigial sideband |
C |
| (3) |
Emission
in which the main carrier is angle-modulated: |
|
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—Frequency modulation |
F |
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—Phase modulation |
G |
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Note: Whenever frequency modulation (F) is indicated, phase
modulation (G) is also acceptable. |
| (4) |
Emission in which the main carrier is amplitude- and angle-modulated either
simultaneously or in a pre-established sequence |
D
|
| (5) |
Emission of pulses1 |
|
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—Sequence of unmodulated pulses |
P |
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—A sequence of pulses: |
|
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—Modulated in amplitude |
K |
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—Modulated in width/duration |
L |
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—Modulated in position/phase |
M |
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—In which the carrier is angle-modulated during the period
of the pulse |
Q
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—Which is a combination of the foregoing or is produced by
other means |
V |
| (6) |
Cases not covered above, in which an emission consists of the main carrier
modulated, either simultaneously or in a pre-established sequence in a
combination of two or more of the following modes: amplitude, angle,
pulse |
W |
| (7) |
Cases not otherwise covered |
X
|
| (d) |
Second Symbol—nature of signal(s) modulating the main carrier:
|
|
| (1) |
No
modulating signal |
0 |
| (2) |
A
single channel containing quantized or digital information without the use of
a modulating subcarrier, excluding time-division multiplex |
1 |
| (3) |
A
single channel containing quantized or digital information with the use of a
modulating subcarrier, time-division multiplex |
2 |
| (4) |
A
single channel containing analog information |
3 |
| (5) |
Two or more channels containing quantized or digital information |
7 |
| (6) |
Two or more channels containing analog information |
8 |
| (7) |
Composite system with one or more channels containing quantized or digital
information, together with one or more channels containing analog
information |
9 |
| (8) |
Cases not otherwise covered |
X |
| (e) |
Third Symbol—type of information to be transmitted:2
|
|
| (1) |
No
information transmitted |
N
|
| (2) |
Telegraphy, for aural reception |
A |
| (3) |
Telegraphy, for automatic reception |
B |
| (4) |
Facsimile |
C |
| (5) |
Data transmission, telemetry, telecommand |
D |
| (6) |
Telephony (including sound broadcasting) |
E |
| (7) |
Television (video) |
F |
| (8) |
Combination of the above |
W
|
| (9) |
Cases not otherwise covered |
X |
| (f) |
Type B emission: As an exception to the above principles, damped waves
are symbolized in the Commission’s rules and regulations as type B
emission. The use of type B emissions is forbidden. |
|
| (g) |
Whenever the full designation of an emission is necessary, the symbol for that
emission, as given above, shall be preceded by the necessary bandwidth of the
emission as indicated in ¤ 2.202(b)(1).
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1Emissions
where the main carrier is directly modulated by a signal which has been coded
into quantized form (e.g., pulse code modulation) should be designated under
(2) or (3).
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2In
this context, the word “information” does not include information of a
constant, unvarying nature such as is provided by standard frequency
emissions, continuous wave and pulse radars, etc.
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