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AMANDX PRESENTS


MODES OF TRANSMISSION


Below is a listing of all the various ways radio and TV signals are broadcast


MODULATION CODES COMMONLY USED TYPES ARE: A1A -telegraphy (on - off keying) without modulation by an audio frequency; A1B -amplitude modulation telegraphy with automatic reception, without using a modulating subcarrier; A1D -amplitude modulation data transmission, double sideband, without using a modulating subcarrier; A2A -on-off keying telegraphy using one or several modulating audio frequencies, or on-off keying telegraphy of an amplitude modulated emission; A2B -amplitude modulation telegraphy with automatic reception and using on-off keying of the modulating subcarrier; A2D -amplitude modulation data transmission, double sideband and using a modulating subcarrier; A3C -amplitude modulation facsimile; the main carrier is modulated either directly or by a frequency modulated subcarrier; A3E -amplitude modulation telephony, double sideband; C3F -television, in amplitude modulation, with vestigial sideband; F1A -telegraphy (keyed by frequency variation); F1B -frequency modulation telegraphy with automatic reception, without using a modulating subcarrier; F1D -frequency modulation data transmission, double sideband, without using a modulating subcarrier; F2A -on-off keying telegraphy of an audio frequency for frequency modulation, or by on-off keying of a frequency modulated emission (special case: unkeyed frequency modulated emission); F2B -frequency modulation telegraphy with automatic reception and using on-off keying of the modulating subcarrier; F2D -frequency modulation data transmission, using a modulating subcarrier; F3C -modulation frequency facsimile, by direct modulation of carrier frequency; F3E -frequency modulation telephony; F3F -television with frequency modulation; G1D -phase modulation data transmission, without using a modulating subcarrier; G2D -phase modulation data transmission, using a modulating subcarrier; G3C -phase modulation facsimile: G3E -phase modulation telephony; G3F -television in phase modulation; J1D -amplitude modulation data transmission, single sideband, suppressed carrier, using a modulating subcarrier; J2A -on-off keying telegraphy using one or several modulating audio frequencies, or an on-off keying telegraphy, single sideband, with suppressed carrier; J2D -amplitude modulation data transmission, single sideband, suppressed carrier without using a modulating subcarrier; J3C -amplitude modulation facsimile; single sideband, with suppressed carrier; J3E -amplitude modulation telephony, single sideband, with suppressed carrier; J8E -amplitude modulation telephony, independent sidebands; K1A -on-off keying telegraphy of a carrier transmitted by pulses, without modulation by an audio frequency; K2A -on-off keying telegraphy of one or several audio modulating frequencies, or by on-off keying of a modulated carrier transmitted by pulses (special case: unkeyed modulated carrier transmitted by pulses); K3E -pulse modulation telephony. R3C -amplitude modulation facsimile; single sideband, with vestigial carrier; R3D -amplitude modulation data transmission, single sideband, with vestigial carrier; R3E -amplitude modulation telephony, single sideband, with vestigial carrier;



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