Section 06
Fading
When the same signal reaches a receiver by two paths, the two add and cancel — unevenly across the channel at AM, several times a second in a moving car at FM. These are the failures listeners describe and engineers measure.
3 entries
Everything filed under Fading
Every entry is one propagation or hardware fact and the operating consequence of it.
- Selective fadingTwo paths arriving out of phase at some frequencies and not others, which is why the distortion sounds like it is inside the voice.Entry 06.1
- MultipathReflections off terrain and buildings, and what they do to FM in a moving car.Entry 06.2
- The Grimeton exceptionSAQ in Sweden, an Alexanderson alternator from 1924, still transmitting on 17.2 kHz at a wavelength that barely fades at all.Entry 06.3
Elsewhere in the register