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shortwave radio | communications | Britannica
Long/Short Wave Pass - Deposition Sciences, Inc.
What Is Shortwave Radio? Everything You Need To Know
electromagnetic radiation - Radio waves | Britannica
Shortwave radio in Ukraine: why revisiting old-school technology makes sense in a war
Telegraph and Data Transmission Over Shortwave Radio Links: Fundamental Principles and Networks: Wiesner, Lothar, Wiesner, Lother: 9780471905998: Amazon.com: Books
The Ionosphere - Where Short Waves Are Reflected, June 1935 Short Wave Craft - RF Cafe
Principles of radio transmission and reception with antenna and coil aerials . Fig. io.—Dependence of received current on wave length when external resistance is large However the effect of the adjacent