Unless specified elsewhere in this part, stations will be authorized emissions as provided for in paragraphs (b) through (n) of this section.
A-Amplitude modulation, double sideband with identical information on each sideband.
F-Frequency modulation.
G-Phase modulation.
J-Single sideband with suppressed carrier.
P-Unmodulated pulse.
W-Cases not covered above, in which an emission consists of the main carrier modulated, either simultaneously or in a pre-established sequence, in a combination of two or more of the following modes: amplitude, angle, pulse.
0-No modulation.
1-Digital modulation, no subcarrier.
2-Digital modulation, modulated subcarrier.
3-Analog modulation.
A-Telegraphy for aural reception.
B-Telegraphy for machine reception.
C-Facsimile.
D-Data, telemetry, and telecommand.
E-Voice.
N-No transmitted information.
W-Combination of the above.
47 C.F.R. §90.207