3 ms·
A neat variation from the era is Hellschreiber teleprinter, graphically prints the characters using a spinning head that impacts the tape strip, which results i
by petee 3y ago
A neat variation from the era is Hellschreiber teleprinter, graphically prints the characters using a spinning head that impacts the tape strip, which results in readable messages even with heavy interference
https://en.m.wikipedia.org/wiki/Hellschreiber https://en.m.wikipedia.org/wiki/Hellschreiber
Edit: some ham radio operators still use it for fun, and I'd heard that one of the SDR decoders can read it
- drmpeg 3y agoWith SDR, you can paint an image into the receiver waterfall with OFDM. https://www.youtube.com/watch?v=saac0ZtTeX4 https://www.youtube.com/watch?v=saac0ZtTeX4 (be sure to switch to 1080p) https://github.com/drmpeg/gr-paint https://github.com/drmpeg/gr-paint