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A new modulation system is described by which two voice and three additional teletype subchannels are to be interlaced within a frequency range of a usual standard phone channel. In general, economical aspects govern an effective bandwidth reduction for signal communication. This becomes extremely valid for all relatively narrow-band radio links via satellites in the VHF/ UHF range. With respect to a minimum of material expense, a compact band modulation system was successfully developed and tested in a satellite link. An adequately high intelligibility could be retained at the cost of some fidelity in voice communication.
Date of Publication: Sep 1969