Some lesser modes - Hellschreiber A method of sending and receiving text using facsimile technology A method of sending and receiving text using facsimile technology This mode has been around a long time; the recent use of PC sound cards as DSP units has increased the interest in Hellschreiber This mode has been around a long time; the recent use of PC sound cards as DSP units has increased the interest in Hellschreiber The single-tone version (Feld-Hell) is the method of choice for HF operation The single-tone version (Feld-Hell) is the method of choice for HF operation 35 WPM text rate, with a narrow bandwidth (about 75 Hz).
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