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Opps...sorry John. I went back and reread your email and looked and sure enough there was a lot of FT4 activity on 3.580. Hopefully it's just the contest this weekend.
I believe the "default" frequencies for these digital modes are these...
3.570 USB JT65
3.572 USB JT9
3.573 USB FT8
3.575 USB FT4
3.580 USB PSK
So it doesn't appear to me that there will be a problem next weekend.
It's actually FT8.
I took a look at 80 meters around 01:00 z tonight, and 3.578 to 3.582 was wall to wall FT4. If they are there next week end we will have a tough time with our sprint. Any suggestions on how we should handle this? It was clear from 3.583 to 3.587 but not sure if any other mode uses this section.