Section 02
Day and Night
The same transmitter, licensed twice. When the absorbing layer collapses after sunset, a station's signal arrives where it has no coverage and lands on somebody else's channel — so the night is written into the authorisation as reduced power, a different pattern, or silence.
3 entries
Everything filed under Day and Night
Every entry is one propagation or hardware fact and the operating consequence of it.
- Licensed two waysSeparate day and night power, and why a transmitter drops power or changes pattern at sunset.Entry 02.1
- Clear channelsFrequencies protected for long-distance night coverage, and WLW Cincinnati running 500 kW in the 1930s before it was stopped.Entry 02.2
- Sunrise and sunsetThe switch follows the sun, not the clock, which is why the schedule moves through the year.Entry 02.3
Elsewhere in the register