Emission Designations
The International Telecommunication Union uses an internationally agreed system for classifying radio frequency signals. Each Type of radio emission is classified according to its bandwidth, method of modulation, nature of the modulating signal, and Type of information transmitted on the carrier signal. It is based on characteristics of the signal, not on the transmitter used.
An emission designation is of the form BBBB 123 45, where BBBB is the bandwidth of the signal, 1 is a letter indicating the Type of modulation used, 2 is a digit representing the Type of modulating signal, 3 is a letter corresponding to the Type of information transmitted, 4 is a letter indicating the practical details of the transmitted information, and 5 is a letter that represents the method of multiplexing. The 4 and 5 fields are optional. For example, an emission designation would appear read as 500H A3E, where 500H translates to 500 Hz, and A3E is the emission mode as permitted.
The WPC has authorized the following emission modes:
Emission | Details |
---|---|
A1A |
|
A2A |
|
A3E |
|
A3X |
|
A3F |
|
F1B |
|
F2B |
|
F3E |
|
F3C |
|
H3E |
|
J3E |
|
R3E |
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Read more about this topic: List Of Amateur Radio Frequency Bands In India
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—Ronald Reagan (b. 1911)