A1 A - Double-sideband 1 - a single channel containing quantized or digital information without the use of a modulating sub-carrier A1A CW Telegraphy - for aural reception A1B CW Telegraphy - for automatic reception A1C FAX Facsimile A1D CW(DSB) Data transmission, telemetry, telecommand A2 A- Double-sideband 2- a single channel containing quantized or digital information with the use of a modulating sub-carrier A2A CW Telegraphy - for aural reception A2B CW Telegraphy - for automatic reception A2C FAX Facsimile A2D Data transmission, telemetry, telecommand A3 A- Double-sideband3- a single channel containing analogue information A3C FAX Facsimile A3E AM Telephony (including sound broadcasting) F1 F - Frequency modulation, 1 - a single channel containing quantized or digital information without the use of a modulating sub-carrier F1A CW Telegraphy - for aural reception F1B RTTY(FSK), SITOR-A, BAUDOT, FSK-Hell Telegraphy - for automatic reception F1C FAX Facsimile F2 F- Frequency modulation, 2 - a single channel containing quantized or digital information with the use of a modulating sub-carrier F2A CW Telegraphy - for aural reception F2C FAX Facsimile F2D PACKED(FSK) Data transmission, telemetry, telecommand F3 F - Frequency modulation, 3- a single channel containing analogue information F3C FAX Facsimile F3E FM Telephony (including sound broadcasting) F3F SSTV Television (video) G3 G- Phase modulation, 3 - a single channel containing analogue information G3C FAX Facsimile G3E Telephony (including sound broadcasting) G3F Television (video) J2 J - Single-sideband, suppressed carrier, 2 - a single channel containing quantized or digital information with the use of a modulating sub-carrier J2A CW Telegraphy - for aural reception J2B CW Telegraphy - for automatic reception J2C FAX Facsimile J2D Clover Data transmission, telemetry, telecommand J3 J - Single-sideband, suppressed carrier, 3 - a single channel containing analogue information J3C FAX Facsimile J3E SSB Telephony (including sound broadcasting) J3F ATV Television (video) R3 R - Single-sideband, reduced or variable level carrier, 3 - a single channel containing analogue information R3C FAX Facsimile R3E SSB Telephony (including sound broadcasting)