Mode MFSK

MFSK: error-corrected keyboard text.

Group	Amateur: digital
Default frequency	14.0785 MHz
Default sample rate	2 Msps
In the mode list	Keyboard, 14.0785 MHz

Step-by-step: Tutorial-MFSK

What MFSK is

MFSK is a keyboard-to-keyboard digital mode from the fldigi family.

Frequencies and settings

Setting	Value
Start frequency	14.0785 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, 14.0785 MHz.

What OnAir shows

MFSK4 to MFSK64 keyboard modes (MFSK16 is the usual one) with forward error correction, 14.0785 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, THOR, DominoEX, Hellschreiber