HellZXcreiber • Hackaday Projects

Hellschreiber receiver for the Spectrum, using the tape interface. Presumably you could do a transmitter as well with minimal hardware...

to amateur hellschreiber radio retrocomputing sinclair spectrum ... on 27 April 2014

>>> I before E except after Hellschreiber « SWHarden.com

Hellschreiber beacon with an AVR. This idea sounds worth playing with -- more fun than PSK31 and simpler to transmit!

to avr beacon digimodes electronics hellschreiber microcontroller radio ... on 23 August 2011