Perhaps my problem, I asked them to try something els instead of Mode C, a mode that never proved very successful. Tomorrow morning I'll suggest Mode B and the same P/L. By the way, in the past Mode A gave good results over multiple hops from Santiago de Chile with 17 kW DRM into Switzerland. I think the DRM manual is a bit to theoretic. So far I'm surprised that AIR has been brave to try different parameters. And, isn't that what testing is all about?
Again, my log follows tomorrow, as I let this run unattended from now (2046 UTC).