Mode RTTY

RTTY: radio teletype text.

Group	Amateur: digital
Default frequency	14.08 MHz
Default sample rate	2 Msps
In the mode list	Teletype, 14.080 MHz

Step-by-step: Tutorial-RTTY

What RTTY is

RTTY is radio teletype: 45.45 baud, two tones 170 Hz apart. It is used by amateurs, contests and weather broadcasts.

Frequencies and settings

Setting	Value
Start frequency	14.08 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 Teletype, 14.080 MHz.

What OnAir shows

RTTY teletype (45.45 bd, 170 Hz shift) on upper sideband, 1 to 30 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, CW, SSTV, HamDRM, Olivia, Contestia, MFSK, THOR, DominoEX, Hellschreiber