Rik has released software, derived from elements of WSJT-X, which enables communications using the slower JT9 modes – specifically JT9-2 (2 minute periods) and JT9-5 (5 minute periods).
Software available here (Windows): SlowJT9
The only mode of JT9 currently supported in WSJT-X is JT9-1 (1 minute, with various sub-modes) but in earlier incarnations slower JT9 modes were included. There has been discussion that, with the much increased levels of interest in LF/MF, a revival of the slower modes might facilitate some long distance contacts that are not possible with JT9-1 – this release will enable these experiments to continue.
I’m currently monitoring JT9-2 and JT9-5 on LF and MF and will report any results.