German Wehrmacht Radios
(Feldfernschreiber) - Special field
teleprinter (aka Hellschreiber, Feldhellschreiber, Typenbildschreiber,
S-H-Feldschreiber) where each character was translated into various
combinations of tones. Designed by German engineer Rudolf
Hell in 1925. Manufactured by Siemens from 1933.
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Equipment was simple enough, required only an A1 transmitter and
receiver, and at the time was more reliable than 5-level code teleprinters.
Additional information may be found in "German Field Line
Communication Equipment of WW2" by Funksammler.