انواع مدولاسيون

A1A : Continuous Wave (CW) Double side-band telegraphy for aural reception which contains quatized digital information without the use of modulating subcarrier. (allotted to Grade II , Grade I and Advance Grade Licence holders)

A2A: Continuous Wave (CW) Double side-band telegraphy for aural reception, which contains quatized digital information with the use of modulating subcarrier.

A3E: Double side-band single channel analog transmission containing telephony (including sound broadcasting). Commonly known as AM (Amplitude Modulation).

H3E: Single side band, full carrier single channel analog transmission containing telephony (including sound broadcasting).

J3E: Single side band, suppressed carrier single channel analog transmission containing telephony (including sound broadcasting).

R3E: Single side band, reduced or variable-level carrier single channel analog transmission containing telephony (including sound broadcasting).

F3E: Frequency modulated single channel analog transmission containing telephony (including sound broadcasting).

F1B:Frequency modulated single channel telegraphy transmission containing quantized digital information for automatic reception.

F2A: Frequency modulated single channel telegraphy transmission containing quantized digital information for aural reception.

F2B: Frequency modulated single channel telegraphy transmission containing quantized digital information with modulating sub-carrier for automatic reception.

F3C: Frequency modulated single channel analog facsimile transmission.

A3C: Amplitude modulated double side-band single channel analog facsimile transmission.

A3F: Amplitude modulated double side-band single channel analog video transmission.

Each letter/digit of the designation of emission represent independent meaning as assigned to them.
Type of Modulation of the Main Carrier (First Symbol)     Nature of signals modulating the main carrier (Second symbol)     Type of information to be transmitted (Third symbol)
A-Double side-band Amplitude Modulation
H-Signle Sideband full carrier
R-Single Sideband reduced or variable level carrier
J-Single Sideband suppressed carrier
F-Frequency Modulation
G-Phase Modulation
P-Emission of Unmodulated Pulses
    0-No modulating signal
1-A single channel containing quantized or digital information without the use of a modulating subcarrier.
2-A single channel containing  quantized or digital information with the use of a modulating subcarrier
3-A single channel containing analog information
    A-Telegraphy for aural reception
B-Telegraphy for automatic reception
C-Facsimile
D-Data transmission, telemetry, telecommand
E-Telephony (including sound broadcasting
F-Television (Video)
N-No information transmitted
W-Combination of the above
X-Cases not covered otherwise