A mail reflector dedicated to human readable radio text transmission techniques. These techniques use uncoded transmissions and involve no interpretation of the received signal by the receiving equipment; instead the human eye and brain are used to provide advanced character recognition.

Hellschreiber techniques include Feld-Hell (on-off keyed) and MT-Hell (time domain). These modes have a growing following among Amateur Radio HF operators, as they have remarkable noise and interference rejection capability, and yet the signals are easy to generate and simple to use.