As a relative newbie, I'm always trying to learn and one thing I haven't figured out is how to tell that a station is operating F/H like VP8PJ or some other kind of multi signal method as TU5PCT.  So far, the only way I know what is going on is when someone posts it in a spot.  I guess I'm looking for how that person knew what was going on.
Tnx es 73,
Ken - K4XL