A Six-channel high-frequency telemetry system

A frequencymultiplex f.m.-a.m. system is described which provides six continuous channels via which waveforms with frequency components in the approximate band 10 c/s to 10 kc/s may be simultaneously telemetered; extension of the frequency coverage to include the band 0¿10 c/s is achieved by the use of commutated reference levels. A radio frequency in the 465 Mc/s band and sub- carrier frequencies between 250 and 500 kc/s are used. A short historical introduction is followed by descriptions of the system and of units of the flight and ground equipment, and details of operational results. Future uses of the system are discussed and methods of increasing the useful range are wggested.