Faster access than browser!
6 relations: Federal Communications Commission, Pre-sunrise and post-sunset authorization, Skywave, Sunrise, Sunset, Surface wave.
Federal Communications Commission
The Federal Communications Commission (FCC) is an independent agency of the United States government created by statute (and) to regulate interstate communications by radio, television, wire, satellite, and cable.
New!!: Critical hours and Federal Communications Commission · See more »
Pre-sunrise and post-sunset authorization
In USA AM broadcasting, presunrise authorization (PSRA) and postsunset authorization (PSSA) are permission from the Federal Communications Commission to broadcast in AM on mediumwave using a power level higher than what would normally be permitted prior to sunrise/after sunset, or in the latter case, provide Class D stations with service into the evening where they would otherwise be required to sign off.
New!!: Critical hours and Pre-sunrise and post-sunset authorization · See more »
Skywave
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.
New!!: Critical hours and Skywave · See more »
Sunrise
Sunrise or sun up is the instant at which the upper edge of the Sun appears over the horizon in the morning.
New!!: Critical hours and Sunrise · See more »
Sunset
Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth's rotation.
New!!: Critical hours and Sunset · See more »
Surface wave
In physics, a surface wave is a mechanical wave that propagates along the interface between differing media.
New!!: Critical hours and Surface wave · See more »
Redirects here:
Canadian Restricted Hours, Critical Hours.
