Q65

Q65

Frequencies	50.275 MHz,50.305 MHz,144.17 MHz
Frequency Range	50.275 MHz - 144.17 MHz
Mode	USB
Modulation	MFSK
ACF	—
Emission Designator	—
Bandwidth	19 Hz,38 Hz,49 Hz,75 Hz,150 Hz,195 Hz,301 Hz,390 Hz,780 Hz,108 Hz,217 Hz,433 Hz,867 Hz,1.733 kHz,98 Hz
Location	Worldwide
Short Description	Q65 is a 65-FSK extreme weak-signal mode which is designed for Earth-Moon-Earth communications and fast-fading propagation modes such as tropospheric scatter, rain scatter and trans-equatorial propagation. It offers a variety of submodes. Q65 is part of the WSJT-X software.
I/Q Raw Recording	—
Audio Sample

Q65 is a 65-FSKFrequency-Shift Keying extreme weak-signal communications mode which is designed for Earth-Moon-Earth communications and fast-fading propagation modes such as tropospheric scatter, rain scatter and trans-equatorial propagation. It is part of the WSJT-X software. Like other WSJT-X modes such as FT8 and JT65, Q65 only carries the minimal amount of information needed to make contacts (QSO's).

Q65 offers a variety of submodes with different tone spacing, and transmit/receive slot lengths from 15 to 300 seconds. The default submode is Q65-30A. Q65 decoder can average over several receive windows to decode weak signals.

Q65 submodes

Submode	Symbol length	Tone spacing	Bandwidth	Transmission duration	Minimum SNR for decoding
Q65-15A	0.15 s	6.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	433 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	12.8 s	-22.2 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-15B	0.15 s	13.33 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	867 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	12.8 s	-22.2 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-15C	0.15 s	26.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	1733 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	12.8 s	-22.2 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-30A	0.30 s	3.33 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	217 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	25.5 s	-24.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-30B	0.30 s	6.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	433 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	25.5 s	-24.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-30C	0.30 s	13.33 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	867 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	25.5 s	-24.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-30D	0.30 s	26.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	1733 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	25.5 s	-24.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-60A	0.60 s	1.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	108 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	51.0 s	-27.6 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-60B	0.60 s	3.33 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	217 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	51.0 s	-27.6 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-60C	0.60 s	6.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	433 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	51.0 s	-27.6 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-60D	0.60 s	13.33 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	867 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	51.0 s	-27.6 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-60E	0.60 s	26.67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	1733 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	51.0 s	-27.6 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-120A	1.33 s	0.75 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	49 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	113.3 s	-30.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-120B	1.33 s	1.50 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	98 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	113.3 s	-30.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-120C	1.33 s	3.00 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	195 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	113.3 s	-30.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-120D	1.33 s	6.00 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	390 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	113.3 s	-30.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-120E	1.33 s	12.0 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	780 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	113.3 s	-30.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-300A	3.46 s	0.29 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	19 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	293.8 s	-33.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-300B	3.46 s	0.58 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	38 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	293.8 s	-33.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-300C	3.46 s	1.16 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	75 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	293.8 s	-33.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-300D	3.46 s	2.31 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	293.8 s	-33.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.
Q65-300E	3.46 s	4.63 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	301 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).	293.8 s	-33.8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.

Note that submodes Q65-15D, Q65-15E and Q65-30E do not exist.

Samples

The showcase sample is Q65-30A. These samples were recorded directly from WSJT-X. If you have samples of actual Q65 transmissions, please add them here!

Q65-30A	Q65-30B	Q65-30C	Q65-30D

Q65-15A	Q65-60A	Q65-60E	Q65-120A

Frequencies

Some known frequencies for Q65 use include 50.275 MHzMegaHertz (MHz) 10^6 Hz, 50.305 MHzMegaHertz (MHz) 10^6 Hz and 144.170 MHzMegaHertz (MHz) 10^6 Hz. It might be found on EME frequencies, and frequencies used for tropospheric scatter and similar propagation modes.

Decoding Software

WSJT-X

Additional Links

• WSJT-X 2.6.1 user guide
• WSJT-X and the Q65 mode for 6 meters and Up - K5ND
• Q65 Frequencies EU vs. NA