00000nam 2200000zi 4500 9.892622 CaOODSP 20221107173225 m o d f cr bn||||||||| 201020s1984 onca ob f000 0 eng d CaOODSP eng rda CaOODSP Co24-3/8-723-1984E-PDF Butterworth, J. S., author. Propagation measurements for land-mobile satellite systems at 1542 MHz / by J.S. Butterworth. Ottawa : Communications Research Centre, 1984. 1 online resource (30 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC technical note ; no. 723 "Mobile Studies Group, Directorate of Space Systems." "August 1984." Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. Some pages rotated in this copy. Includes bibliographical references (page 10). "A measurement program was undertaken with the objective of providing engineering design data on excess path-loss for potential land-mobile satellite systems operating in the 1500 MHz band. In the suburban and rural areas which could be served by such a system, fading due to multipath propagation and shadowing by terrain obstacles were the two phenomena characterized. Using an omni-azimuth vehicle antenna to receive a signal at 20 degrees elevation from the MARECS A satellite, the diffuse multipath signals were found to be 10 dB less than the direct component. The percentage of shadowed locations on the test routes varied from 5% in open farmland to 33% in suburban locations. The corresponding signal margins required to provide 99% coverage over the various test routes ranged from 12 dB to 21 dB"--Abstract, page 1. Issued also in print format. Mobile communication systems. Artificial satellites in telecommunication. Radio wave propagation Measurement. Radiocommunications mobiles. Satellites artificiels dans les télécommunications. Ondes radioélectriques Propagation Mesure. Communications Research Centre (Canada), issuing body. CRC technical note ; no. 723. (CaOODSP)9.882494 PDF 965 KB https://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-8-723-1984-eng.pdf