Pagemaster receiver and modulation equipment
John W. Young · Transactions of the American Institute of Electrical Engineers Part I Communication and Electronics · 1959
At present, there are many varied types of paging systems on the market which are applicable to the many types of services or industries requiring paging systems. Each of these, whether they be audio, inductive loop, r-f (radio-frequency), light, bell, or any other type of system, has certain advantages and limitations. The results of a comprehensive investigation of the paging field showed that there was a definite need and a market for a selective r-f paging system. In many instances such a system could adequately replace, with improved operation, the existing type of system. In other instances it could advantageously supplement an existing paging system with a resultant improvement in the overall paging operation.