Radio network

There are two types of radio networks currently in use around the world: the one-to-many broadcast network commonly used for public information and mass media entertainment; and the two-way radio type used more commonly for public safety and public services such as police, fire, taxicabs, and delivery services. Cell Phones are able to send and receive simultaneously by using two different frequencies at the same time. Many of the same components and much of the same basic technology applies to all three.

The Two-way type of radio network shares many of the same technologies and components as the Broadcast type radio network but is generally set up with fixed broadcast points (transmitters) with co-located receivers and mobile receivers/transmitters or Transceivers. In this way both the fixed and mobile radio units can communicate with each other over broad geographic regions ranging in size from small single cities to entire states/provinces or countries. There are many ways in which multiple fixed transmit/receive sites can be interconnected to achieve the range of coverage required by the jurisdiction or authority implementing the system: conventional wireless links in numerous frequency bands, fibre-optic links, or micro-wave links. In all of these cases the signals are typically backhauled to a central switch of some type where the radio message is processed and resent (repeated) to all transmitter sites where it is required to be heard.

ABC Radio

ABC Radio may refer to:

Cumulus Media Networks

Cumulus Media Networks was an American radio network owned and operated by Cumulus Media. From 2011 until its merger with Westwood One, it controlled many of the radio assets formerly belonging to the American Broadcasting Company (ABC), which was broken up in 2007; Cumulus owned the portion of the network that was purchased by Citadel Broadcasting that year. The network adopted its final name in September 2011, following Cumulus's acquisition of Citadel; prior to this, it had been known as Citadel Media Networks since April 2009, after licensing the "ABC Radio Networks" name from The Walt Disney Company for nearly two years. ABC now operates a revived ABC Radio Network that owns no stations but produces (mostly short-form) audio content.

It was also (as ABC Radio Networks) the penultimate of the major radio networks to still be owned by its original founding company until 2007, CBS Radio being the last. Mutual Broadcasting Network was dissolved in 1999 and then NBC Radio Network, after selling all of its stations in 1988, followed suit in 2004.

ABC

ABC are the first three letters of the Latin script known as the alphabet.

ABC or abc may refer to:

Broadcasting

November 22

November 22 is the 326th day of the year (327th in leap years) in the Gregorian calendar. There are 39 days remaining until the end of the year.

In the ancient astronomy, it is the cusp day between Scorpio and Sagittarius. In some years it is Sagittarius, but others Scorpio. It depends on solar term Xiaoxue (Minor snow).

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