00000nam 2200000zi 4500 9.892921 CaOODSP 20221107173313 m o d f cr bn||||||||| 201027e197112##onca ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- Co24-3/7-1225-1971E-PDF Jelly, Doris H., author. Ionospheric sounding as an aid to HF communications / by Doris H. Jelly. Ottawa : Communications Research Centre, Department of Communications, December 1971. 1 online resource (iii, 10 pages) : illustration. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC report ; no. 1225 Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. Includes bibliographical references (pages 9-10). "A review of sounding systems that could be used to improve HF communications is presented. Systems that are outlined are the sophisticated CURTS, which was developed for the U.S. Defence Communications Systems; CHEC and Channelsonde which were designed to aid Canadian military operations; and the integrated system that was proposed as a solution to communications problems in the Canadian north. From a consideration of these systems, it is apparent that the technology exists for developing sounding systems for a wide variety of applications"--Abstract, page 1. Shortwave radio. Sounding and soundings. Radiodiffusion en ondes décamétriques. Sondage (Océanographie) Ondes radioélectriques Propagation dans l'ionosphère. Ionospheric radio wave propagation. Communications Research Centre (Canada), issuing body. CRC report ; no. 1225. (CaOODSP)9.882492 PDF 766 KB https://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-7-1225-1971-eng.pdf