MMI Technical Resource
   Updated 5 March 2003 Emission Designations   

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  • Bandwidth
    This is the required bandwidth of the transmitter.
    The above example represents "16.0kHz bandwidth".
    The decimal point is replaced with "H", "K", "M", or "G".
    These define as:
    H = Hertz
    K = Kilohertz
    M = Megahertz
    G = Gigahertz
     
    1st Digit
    A = AM (Amplitude Modulation), double-sideband
    B = AM, independent sidebands
    C = AM, vestigial sideband
    D = Amplitude and Angle Modulated carrier
    F = Angle Modulated, frequency modulation
    G = Angle Modulated, phase modulation
    H = AM, single-sideband, full carrier
    J = AM, single-sideband, suppressed carrier
    K = Pulse, amplitude modulation (PAM, PSM)
    L = Pulse, width modulation (PWM)
    M = Pulse, phase or position modulation (PPM)
    N = Emission of an unmodulated carrier
    P = Pulse, no modulation
    Q = Pulse, carrier also angle-modulated during pulse
    R = AM, single-sideband, reduced or variable level carrier
    W = Pulse, two or more modes used
    X = All cases not covered above
     
    2nd Digit
    0 = No Modulation
    1 = Digital, on-off or quantized, no modulation
    2 = Digital, with modulation
    3 = Single analog channel
    7 = Two or more digital channels
    8 = Two or more analog channels
    9 = Composite, one or more digital channel, one or more analog
    X = All cases not covered above
     
    3rd Digit
    A = Aural telegraphy, for people (Morse code)
    B = Telegraphy for machine copy (RTTY, fast Morse)
    C = Analog fax
    D = Data, telemetry, telecommand
    E = Telephony, voice, sound broadcasting
    F = Video, television
    N = No Information
    W = Combinations of the above
    X = All cases not covered above

    Special thanks to ominous-valve.com for this information.
    © 2003 MMI Technical Resource
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