I’ve had a couple of JT9 attempts these past two days on 20m where I’ve answered a CQ and received a signal report back, and sent mine but then received the same -nn signal report again. And again. Presumably the remote station has not been able to decode my reply. So I never get to the 73. I’m guessing the band just fades away from underneath me…
If I remember right it was the same remote station each time. I’ve had successful JT9 QSOs so I am putting these down to bad luck and I hope the other guy isn’t getting frustrated!