00000nam 2200000zi 4500 9.893025 CaOODSP 20221107173331 m o d f cr bn||||||||| 201029e197111##onca o f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- Co24-3/7-1228-1971E-PDF DuCharme, E. D., author. HF predictions : description of services / by E.D. Ducharme and J.L. Thomas. Ottawa : Communications Research Centre, Department of Communications, November 1971. 1 online resource (iii, 6 pages) : figures. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC report ; no. 1228 Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. "This report describes the HF Prediction Services available from the Communications Research Centre"--Abstract, page 1. Communications Research Centre (Canada) Centre de recherches sur les communications (Canada) Shortwave radio. Ionospheric radio wave propagation. Radiodiffusion en ondes décamétriques. Ondes radioélectriques Propagation dans l'ionosphère. Communications Research Centre (Canada), issuing body. CRC report ; no. 1228. (CaOODSP)9.882492 PDF 929 KB https://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-7-1228-1971-eng.pdf