Section 01
Propagation
Four ways a signal gets from a mast to a receiver, and the reason the answer is different at noon and at midnight. Ground wave follows the surface and pays for it in soil conductivity; skywave leaves at an angle and comes back only if the layer above allows it.
4 entries
Everything filed under Propagation
Every entry is one propagation or hardware fact and the operating consequence of it.
- Ground waveThe signal that follows the curve of the earth, and why soil conductivity decides how far it gets.Entry 01.1
- SkywaveRefraction off the ionosphere, and why it turns a local transmitter into a long-distance one after dark.Entry 01.2
- The D layerThe absorbing layer that exists only in daylight — the single fact behind almost every peculiarity of AM broadcasting.Entry 01.3
- Appleton's proofEdward Appleton measured the reflecting layer experimentally and took the 1947 Nobel Prize for it.Entry 01.4
Elsewhere in the register