Current development of transistors and electronic circuitry provides an opportunity for further advances in the development of portable equipment for studying physiological function in ambulant and working subjects.1 With encouragement, about four years ago we began the design of a portable transmitting and recording system. Objectives were as follows: the transmitter should be compact and not over 2 lb. in weight; the system should transmit the frequencies encountered in most physiological studies, i. e., 0 to 1,000 cps; the system should transmit and record more than one channel simultaneously; the transmitter should transmit all channels requiring only the addition of suitable transducers and preamplifiers for the various types of physiological information desired; and the system should be operable by persons without radio engineering experience. Electrocardiographic transmission was selected for the first design because it represents an important band of physiological frequencies and we were familiar with the circuit problems.
Dunn FL, Beenken HG. SHORT DISTANCE RADIO TELEMETERING OF PHYSIOLOGICAL INFORMATION. JAMA. 1959;169(14):1618–1621. doi:10.1001/jama.1959.73000310001015
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