by Klaas Robers » Mon Jun 18, 2018 2:34 am
Well, we do... or we did. At Saturday morning on 80 meters SSB. Vic Brown did so. The status may be less optimistic at this moment, but you can read about the experiments he did in the NBTV Newsletters of the last few years.
However, short wave has some problems in propagation of NBTV signals. Yes, they bridge large distances, sometimes around the globe, but the "reflections" in the ionosphere at a height of 250 km are no "hard, sharp" mirror like reflections. Different waves transmitted at the same moment, reflect at different points in the ionosphere and arrive at the receiver at different moments in time. This gives "ghost images" in the received picture. This occurs in speech as well. but our ears are much less sensitive to those "reflections", as they occur as well in the form of fast echos and reverberation in rooms with solid walls. So we are used to it. But in pictures built up from lines on a screen this is deadly. The result is that now and then you see something recognizable. Enjoying a program over a longer time span is something completely different.