op I was trying to show your theory that all is the same was a folly. You obviously know better and I'm wrong. Sorry I said anything that you don't agree with. Btw how did your a.n.other 868 work?
I was thinking about how they work, am might be part of it but am isn't anything to do with how they detect movement, well not at more than a few cm
I've just reread yes it probably is that basic