Mode Q65

Q65: weak-signal, EME and scatter contacts.

Group	Amateur: digital
Default frequency	14.1 MHz
Default sample rate	2 Msps
In the mode list	WSJT, 14.100 MHz

Step-by-step: Tutorial-Q65

What Q65 is

Q65 is a weak-signal digital mode of the WSJT family, decoded by the same receiver as FT8.

Frequencies and settings

Setting	Value
Start frequency	14.1 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 WSJT, 14.100 MHz.

What OnAir shows

Q65 (A to E, 15 s to 5 min periods) for EME, scatter and weak-signal work: Q-ary repeat-accumulate code, 65-FSK.

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, FST4, MSK144, PSK31, JS8Call, RTTY, CW, SSTV, HamDRM, Olivia, Contestia, MFSK, THOR, DominoEX, Hellschreiber