|A sample of received Hellschreiber test from Bryan's beacon|
This process was historically accomplished with mechanical equipment but there are very few examples of this equipment still in operation and it is now sent and received by computer. Hellschreiber is very tolerant of noise and interference and requires only simple transmitters and receivers to work effectively.
|German Hellschreiber unit in operation|
Receiving the signal and decoding requires a radio receiver capable of CW reception and a computer running any of several free software packages like FLdigi or Digital Master 780.
|The ZL1HIT beacon using a PIC microprocessor and a simple crystal oscillator transmitter.|