Use of the Radio Spectrum; Demand for the spectrum; Coexistence; Constructive use of a limited resource; Spatial separation; The time domain; The frequency domain; Exploiting time; Trunking and packets; Exploiting time and space; Cellular radio; Transmission orthogonality in the sequency domain (CDMA); The Radio Bands; Summary band by band; ELF, ULF, SLF, VLF, LF, MF, HF, VHF, UHF, SHF, EHF; Conclusion.
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Excerpt from Radio Spectrum Conservation: A Program of Conservation Based on Present Uses and Future Needs The subject of this volume is one of far-reaching importance to society at large. Since its inception radio communication has been plagued by a shortage of space for ever-increasing numbers of stations and new services, from ship-to-shore "wireless" in 1902 to television in 1952. As new regions of the radio spectrum have been explored and opened to practical operations, commerce and industry have found more than enough new uses to crowd them. As a result it has become increasingly clear that the spectrum is a public domain which must be conserved as carefully as if it were farm land, forest preserves, water power, or mineral wealth. The job of conservation has been complicated by the fact that wise administration by government, while essential, is not sufficient. Radio obeys the laws of nature, and its administration must proceed within the confines of scientific knowledge and procedures, some of which, such as the equations governing the propagation of radio waves over and above the earth, are as complicated as any that science has to offer. Add to this the fact that radio transmissions, in one form or another, affect the life of nearly every inhabitant of the globe. Radio is essential to the safety of sea and air travel, carries a substantial portion of all information across international borders, makes the difference between winning a war or losing it, gives entertainment and, it is to be hoped, education to half the population of the world. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
