Hellschreiber - G7SYW's amateur radio bits & bobs...
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| Posted in Digi-modes

HELLSCHREIBER is a method of sending and receiving text using fax style technology.

This mode has been around since before World War II.

The most popular version (Feld-Hell) is the method of choice for HF operation.

It is an on-off keyed system with 122.5 dots/second, or about a 35 WPM text rate, with a narrow bandwidth (about 75 Hz).

As with telephone based fax machines the received text appears on the screen looking like a “rough” photocopy.