Who Was Who in the Aether of the Weimar Republic? Tracing the Callbooks That Never Existed

A listing of amateur radio operators is provided who actively transmitted on shortwave during the Weimar Republic in Germany (1924-1933). Some biographical information is added, when available. Such a listing never existed before because transmissions were clandestine. It is helpful for researching the history of electrical engineering and radio in this period. The listing is subdivided by different time periods between which the call sign system changed. Each time period contains separate alphabetical lists of official (“lis”) and unofficial (“unlis”) calls. For reference we added also a list of the calls EK4/D4 operators and DE listeners held after 1949. D4 and DA calls in the period from 1933-1948 are included, when known, but not alphabetically listed.(1) 1927-1930: 1a) EK4xxx/D4xxx – “lis”; 1b) EK4xx/D4xx – “unlis”; 1c) Foreign calls of EK/D stations(2) 1930-1933: 2a) D4xxx – “lis”; 2b) D4xxx – “unlis”; 2c) Foreign calls of EK/D stations; 2d) Arbeiterempfangsdienst SWLs(3) 1924-1927: 3a) KA0-KZ9 – “lis”; 3b) Freestyle calls – “unlis”; 3c) Occupational forces; 3d) Official freestyle calls(4) After 1949: Post-WW2 calls of EK/D stations and holders of DE numbers (< DE6000)