RF/무선 장비 또는 Radio Module의 사양서를 보면 문서에 무선 전신 법에 관해서 어떤 식으로든 ‘F2D, A3E, F1D’과 같은 전파 형식기호를 볼 수 있습니다. 이들은 Emission Classes에 관련된 RF/무선 전파 형식을 의미합니다. Emission Class는 반송주파수의 변조 그리고 반송주파수로부터 변조되는 시그널의 종류 그리고 전송 정보의 목적을 나타냅니다.
예를 들어, ‘F1D’의 형식기호는 ‘주파수 변조(FSK)’, ‘디지털 신호’, ‘단일채널’ 과 ‘데이터 전송’용이라는 의미를 담고 있습니다.
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1. Main carrier modulation types |
Symbol |
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(1) Non-modulation |
N |
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(2) Amplitude modulation |
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1.Double sideband |
A |
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2.Full carrier single sideband |
H |
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3.Reduced carrier single sideband |
R |
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4.Suppressed carrier single sideband |
J |
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5.Independent sideband |
B |
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6.Vestigial sideband |
C |
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(3) Angle modulation |
|
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1.Frequency modulation |
F |
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2.Phase modulation |
G |
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(4) The main carrier is amplitude and angle modulated either simultaneously or in a certain sequence |
D |
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(5) Pulse |
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1.Unmodulated pulse sequence |
P |
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2.Pulse sequence |
K |
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a. Amplitude modulation |
L |
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b. Amplitude modulation or width/duration modulation |
M |
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c. Position modulation or phase modulation |
Q |
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d. The carrier is angle modulated during the angle-period of the pulse |
V |
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e. A combination of a. through d., or that uses another method |
|
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(6) Modulation not covered by (1) through (5) and using a combination of 2 or more of amplitude modulation, angle modulation or pulse modulation, simultaneously or in a certain sequence |
W |
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(7) Other |
X |
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2. Nature of signals that modulate the main carrier |
Symbol |
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(1) No modulating signal |
0 |
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(2) Digital signal, single channel |
|
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1.Without the use of a modulating sub-carrier |
1 |
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2.With use of a modulating sub-carrier |
2 |
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(3) Analog signal, single channel |
3 |
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(4) Digital signal, with two or more channels |
7 |
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(5) Analog signal, with two or more channels |
8 |
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(6) Composite system that combines 1 or more channels for digital signals with 1 or more channels for analog signals |
9 |
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(7) Other |
X |
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3. Transmission information types |
Symbol |
|
(1) Non-information |
N |
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(2) Telegraphy |
|
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1.For aural reception |
A |
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2.For automatic reception |
B |
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(3) Facsimile |
C |
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(4) Data transmission, telemetry, or telecommand |
D |
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(5) Telephony (including sound broadcasting) |
E |
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(6) Television (video) |
F |
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(7) A combination of the types (1) through (6) |
W |
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(8) Other |
X |