Mode Hellschreiber

Hell: text drawn as a picture.

Group	Amateur: digital
Default frequency	14.063 MHz
Default sample rate	2 Msps
In the mode list	Keyboard, 14.063 MHz

Step-by-step: Tutorial-Hellschreiber

What Hellschreiber is

Hellschreiber (Hell) sends text as a picture of its letters: a mode from the fldigi family.

Frequencies and settings

Setting	Value
Start frequency	14.063 MHz
Tuning range of the mode table	1 to 30 MHz
Sample rate asked	2 Msps
Lowest working rate	250 ksps
Channel width	3 kHz

OnAir takes any frequency you type; the numbers above are the mode's starting point and the range its table describes. In the app the shortcut label is Keyboard, 14.063 MHz.

What OnAir shows

Hellschreiber (Feld Hell, Slow Hell, Hell 80, HellX5): text as a picture of dots, 14.063 MHz.

Tips and caveats

• Checked with generated signals and impairments; recordings of real signals welcome.
• Which radio: An RTL-SDR can receive HF only in direct-sampling mode, which OnAir offers in its radio settings; results depend on the antenna. SDRplay and Airspy HF+ radios are better suited.
• Try it without a radio: most modes include a built-in synthetic test signal, so you can open the screen and try the controls first.
• Receiving and the law: Amateur radio signals are meant to be received. Receiving needs no licence in most countries; OnAir does not transmit. See Legal.

Related pages

• All modes, Amateur: digital
• Supported radios, Troubleshooting, FAQ
• More in Amateur: digital: FT8, FT4, FT2, WSPR, JT65, JT9, Q65, FST4, MSK144, PSK31, JS8Call, RTTY, CW, SSTV, HamDRM, Olivia, Contestia, MFSK, THOR, DominoEX