Rik, ON7YD – OR7T, releases JT9-2 and JT9-5 software for LF/MF applications

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.

6 Replies to “Rik, ON7YD – OR7T, releases JT9-2 and JT9-5 software for LF/MF applications”

  1. Hi, I have been trying to get slowjt9 to work, no luck. It either crashes or does not decode anything. I have WSJT-X running with same set up, connections, sound card, etc., it works fine. WSJT-X decodes lots of JT9 signals on 630 meters, so I think my set up here is ok? I have tried two different sound cards, Singalink and an ASUS U5, both work with WSJT-X but not SlowJT9? When I am able to get SlowJT9 to run, it will show what looks like, either WSPR or JT9 signals on the waterfall, so I think it is getting audio from the sound cards. I know there are JT9-2 signals locally, in same area few km away, but no decodes?
    If you have any suggestions it would be appreciated.
    Thank you 73

  2. When clicking answer out of sequence it resets the watch dog timer and the only
    way around seems to be restarting the program.
    Happy holidays Joe wa9cgz

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