PhosphorFeld

By Stuart Woolley on AppTrack Ninja.

Hellschreiber Decoder

PhosphorFeld decodes Hellschreiber (Feld-Hell) signals in real time using your iPhone's microphone. Point your phone at any shortwave radio tuned to 14.063 MHz and watch the letters paint themselves onto your screen, pixel by pixel, exactly as Rudolf Hell intended when he invented the system in 1929. Hellschreiber is the oldest digital mode still in active use. Unlike RTTY or FT8, which transmit character codes, Hell transmits the actual pixel shapes of each character as an on-off keyed audio tone. There is no character set, no encoding table, no error correction. The signal paints its own le…

Categories: Utilities, Entertainment

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