Mode MSK144

MSK144: meteor scatter bursts.

Group	Amateur: digital
Default frequency	28.145 MHz
Default sample rate	2 Msps
In the mode list	Meteor scatter, 28.145 MHz

Step-by-step: Tutorial-MSK144

What MSK144 is

MSK144 is a fast WSJT mode for meteor-scatter contacts.

Frequencies and settings

Setting	Value
Start frequency	28.145 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 Meteor scatter, 28.145 MHz.

What OnAir shows

MSK144 meteor scatter (72 ms frames, 2000 baud, 15 s periods): decodes the short bursts of meteor trails.

The mode's own tab has these screens: Decodes, Map. The other tabs (Overview, Receiver, Scan, History) are described on the Main window page.

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, PSK31, JS8Call, RTTY, CW, SSTV, HamDRM, Olivia, Contestia, MFSK, THOR, DominoEX, Hellschreiber