Abstract
IN the Bell Laboratories Record of April there is an instructive. paper by A. E. Bachelet explaining some of the difficulties encountered when designing wire networks over which radio programmes are transmitted. These in America often form extensive systems with broadcast stations or studios in most of the larger systems interconnected by high-quality circuits employing amplifiers. The transmission over these circuits differs from ordinary telephone transmission in that it is unidirectional, and one-way amplifiers are employed. Since a studio may either transmit or receive programmes, it is necessary to provide means for changing the direction of transmission over the network. In the past this has been done either by using separate facilities which transmit in opposite directions, or by interchanging the input and the output of the amplifiers by the use of switches manually operated.
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Design of Wire Networks Carrying Radio Programmes. Nature 147, 802–803 (1941). https://doi.org/10.1038/147802c0
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DOI: https://doi.org/10.1038/147802c0