Hellschreiber

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Hellschreiber
Feld Hellthmb.jpg
Frequencies 3 MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation OOKOn-Off Keying Modulation,FSKFrequency-Shift Keying,MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.)
ACF
Bandwidth 350Hz0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
,800Hz0.8 kHzKiloHertz (kHz) 10^3 Hz
8.0e-4 MHzMegaHertz (MHz) 10^6 Hz
0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
0.8 kHzKiloHertz (kHz) 10^3 Hz
8.0e-4 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Hellschreiber (Also known as Feld Hell or just Hell) is a teleprinter system developed in the late 1920's by Rudolf Hell, a German inventor.
I/Q Raw Recording
Audio Sample
Hellschreiber (Also known as Feld Hell or just Hell) is a teleprinter system developed in the late 1920's by Rudolf Hell, a German inventor. Hell physically prints characters onto the screen, unlike other modern teletype modes which encode and decode signals.

Feld Hell (and it's immediate variants) and Slow Hell use On-Off Keying, where Feld Hell 80 (Rudolf Hell's last original Hell mode, designed in the 1970's) uses 2-FSKFrequency-Shift Keying modulation and the FSKFrequency-Shift Keying Hell modes use 2-DMSK (Differential Minimum Key Shifting).

HELLTable.png

Samples[edit]

Feld Hell Feld Hell 80 Slow Hell
Feld Hell.jpg
HELL 80.jpg
Slow Hell.jpg

FSKFrequency-Shift Keying Hell 245 FSKFrequency-Shift Keying Hell 105 FMFrequency Modulation Hell
FSK HELL.jpg
FSK HELL 105.jpg
FM HELL.png

Feld Hell x5

Feld Hell X5.jpg

Feld Hell X9

Feld Hell X9.jpg

Decoding Software[edit]

Hobby Level Software

Additional Links[edit]

Additional Images[edit]