ham2ham

JT65, developed and released in late 2003, is intended for extremely weak but slowly-varying signals, such as those found on troposcatter or Earth-Moon-Earth (EME, or "moonbounce") paths. It can decode signals many decibels below the noise floor, and can often allow amateurs to successfully exchange contact information without signals being audible to the human ear. Like the other modes, multiple-frequency shift keying is employed; unlike the other modes, messages are transmitted as atomic units after being compressed and then encoded with a process known as forward error correction (or "FEC"), which adds redundancy to the data such that the message may be successfully recovered even if all of the bits are not received by the receiver.
Operators have also begun using the JT65 mode for contacts on the HF bands, often using QRP (very low transmit power); while the mode was not originally intended for such use, its popularity has resulted in several new features being added to WSJT in order to facilitate this use.

160m	--- MHz
80m	--- MHz
40m	7.039 MHz (EU) 7.076 MHz (USA)
30m	10.139 MHz
20m	14.076 MHz
17m	18.102 MHz
15m	21.076 MHz
12m	24.920 MHz
10m	28.076 MHz
6m	50.076 MHz
2m	--- MHz
70cm	--- MHz