Total posts : 45366
Those amplitude modulation examples are very interesting. It would be rewarding to find out how they perform.
On the matter of SW antenna, another issue also discussed on this train of comments, I found a HAM’s article about success with a circularly polarized version of a center-fed dipole. Instead of stretching straight out from side-to-side, the sides wrap in a circle or loop like a giant horseshoe. The author said it compensates for the constant phase changes coming from the ionosphere. Of course at our power levels the ionosphere isn’t much involved. If you’d like a link I will provide one.