List of FCC Emission Types The present complete emission types: Type Notes ---- ----- A2 Amplitude Modulated Telegraphy #1,2 A3 DSB (full carrier Telephony) A3A SSB (reduced carrier Telephony) A3B (2 independent sidebands - reduced carrier) #3 A3J SSB (supressed carrier Telephony) A4 DSB Facsimile A4A SSB Facsimile, reduced carrier A4J SSB Facsimile, supressed carrier A5 DSB Television A5C VSB Television #4 (Frequency modulation) F0 carrier - no modulation F1 frequency shift telegraphy #1 F2 frequency modulated telegraphy #1,2 F3 telephony F4 facsimile F5 television ---------------------Notes-------------------------- 1. This is not restricted to Morse - may be RTTY for example. (RTTY could be run on 160 meters if on-off keying of the carrier is used. 2. Examples of this mode are: 1) Carrier keyed on/off 2) carrier on with the modulation keyed on/off 3) carrier on with the modulation frequency shift keyed. 3. This is used by short wave broadcast station studios to transmitter links with seperate programs on each set of sidebands. 4. VSB = Vestigal sidebands where all of one set of side- bands is transmitted but only about 20 percent of the other set of sidebands is transmitted (the lowest frequencies). Common Amateur Emissions: Double Sideband Voice = 6A3 Single Sideband Voice = 3A3J VHF FM Voice = 16F3 25 wpm Mrose CW = = .1A1 (assume max modulating freq of 3KHz and max deviation of 5KHz) Bandwidths are found with the following formulas: A1 Bw = BK (K=5 for fading circuits) A2 Bw = BK+2M A3 Bw = 2M A3J Bw = M A4 Bw = KN+2M (K=1.5) F1 Bw = 2.6D+.55B (when 2D/B is less than 5.5) F1 Bw = 2.6D+.55B (when 2D/B is less than 5.5) Bw = 2.1D+1.9B (when 2D/B is greater than 5.5) F3 Bw = 2M+2DK (K=1) F4 Bw = KN+2M+2d (K=1.5) Where: Bw = necessary bandwidth in HZ B = speed in bauds C = subcarrier freq. in HZ D = 1/2 the diff. between max and min instantaneous freq (in other words, peak deviation). K = fudge factor M = maximum modulating freq. in HZ N = maximum black & white elements per second (N = drum dicrumference x lines per unit length x drum rps) As a result of WARC 79, the very familair symbols of the emissions modes will be changed. The FCC will be implementing the following new symbols over the next several years. Old Symbol New Symbol Old Symbol New Symbol Old Symbol New Symbol Old Symbol New Symbol A0 N0N F0 N0N A1 A1A F1 F1B A2 A2A F2 F2A A2D F2D A2J J2A F3 F3E J2D F4 F3C A3 A3E F5 F3F A3J J3E P P1B A4 A3C A5 C3F A3F Symbol Explanation: First character indicated emission type Second character indicated the nature of the signal Third character indicates the type of information transmitted First Character N = Unmodulated carrier A = Double sideband AM A = Double sideband AM J = Single sideband, suppressed carrier F = Frequency modulation P = Sequence of unmodulated pulses C = Vestigial sidebands Secone Character 0 = No modulating signal 1 = Single channel containing digital information without the use of a modulating subcarrier 2 = Same as above, except using a modulating subcarrier 3 = Single channel containing analog information Third Character N = No information tranjsmitted A = Telegraphy -- aural reception B = Telegraphy -- automatic reception C = Facsimile D = Data transmission, telemetry, telecommand E = Telephony F = Television Example: A1A is double sideband, single channel containing Second Character 0 = No modulating signal 1 = Single channel containing digital information without the use of a modulating subcarrier 2 = Same as above, except using a modulating subcarrier 3 = Single channel containing analog information Third Character N = No information tranjsmitted A = Telegraphy -- aural reception B = Telegraphy -- automatic reception C = Facsimile D = Data transmission, telemetry, telecommand E = Telephony F = Television Example: A1A is double sideband, single channel containing digital information without the use of a modulating subcarrier, telegraphy for aural reception. In other words, CW!