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Emission Designators - First Symbol

Types of Modulation of the Main Carrier:
Emission of an unmodulated carrierN
Emission in which the main carrier is amplitude-modulated (including cases where sub-carriers are angle-modulated):
Single-sideband, full carrierH
Single-sideband, reduced or variable level carrierR
Single-sideband, suppressed carrierJ
Independent sidebandsB
Vestigial sidebandC
Emission in which the main carrier is angle-modulated:
Frequency modulationF
Phase modulationG
Emission in which the main carrier is amplitude and angle-modulated either simultaneously or in a pre-established sequence
Emission of pulses:*
Sequence of unmodulated pulsesP
A sequence of pulses:
Modulated in amplitudeK
Modulated in width/durationL
Modulated in position/phaseM
In which the carrier is angle-modulated during the period of the pulseQ
Which is a combination of the foregoing or is produced by other meansV
Cases not covered above, in which an emission consists of the main carrier modulated, either simultaneously or in pre-established sequence, in a combination of two or more of the following modes: amplitude, angle, pulse
Cases not otherwise covered
Whenever frequency modulation "F" is indicated, Phase modulation "G" is also acceptable.
* Emissions 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 amplitude modulation or angle modulation.
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Emission Designators - First Symbol
Type of modulation of the main carrier
Emission Designators - Second Symbol
Nature of signal(s) modulating the main carrier
Emission Designators - Third Symbol
Type of information to be transmitted