Shortwave radio.

Advanced high-frequency radio communications Eric E. Johnson ... [et al.] 1997 Klystrons and microwave triodes Hamilton, Donald Ross 1948 Microwave transmission design data Moreno, Theodore 1948 Mobile radio network design in the VHF and UHF bands :a practical approach - (E-BOOK) Graham, Adrian W. 2007 Pirate Radio stations Yoder, Andrew 2002 Planning and Engineering of Shortwaves Links Braun, Gerhard 1981 Telegraph and data transmission over short wave radio links Wiesner, Lothar 1975