A Six-System Urban Mobile Telephone Installation with 60-Kilocycle Spacing

This paper describes a 6-system mobile radiotelephone installation in Chicago, operating in the 152-162-megacycle band, and using 60-kc spacing of carrier frequencies, rather than the 120-kc spacing of previous practice. The measures required to achieve this frequency saving are described, including filters and special antenna arrangements at the land transmitter, "off-channel squelch" in the land receivers, connection of six land receivers to a common antenna, and other special co-ordinating means.