KOIN is the CBS

CBS

CBS Broadcasting Inc. is a major US commercial broadcasting television network, which started as a radio network. The name is derived from the initials of the network's former name, Columbia Broadcasting System. The network is sometimes referred to as the "Eye Network" in reference to the shape of...

 affiliate

Network affiliate

In the broadcasting industry , a network affiliate is a local broadcaster which carries some or all of the television program or radio program line-up of a television or radio network, but is owned by a company other than the owner of the network...

 television station serving the Portland metropolitan area

Portland metropolitan area

The Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area , also known as the Portland metropolitan area or Greater Portland, is an urban area in the U.S. states of Oregon and Washington centered around the city of Portland, Oregon. The U.S...

. Its transmitter is located in Portland, Oregon

Portland, Oregon

Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

, United States; it broadcasts its digital signal on UHF

Ultra high frequency

Ultra-High Frequency designates the ITU Radio frequency range of electromagnetic waves between 300 MHz and 3 GHz , also known as the decimetre band or decimetre wave as the wavelengths range from one to ten decimetres...

 channel 40. KOIN's studios are located in the basement of the KOIN Center

KOIN Center

KOIN Center is a , 35-storey, skyscraper in Portland, Oregon. The building, the third tallest in the city, was designed by the firm of Zimmer Gunsul Frasca Partnership and opened in 1984 at a cost of .-History:...

 skyscraper on SW Columbia Street in Downtown Portland

Downtown Portland

Downtown Portland, the city center of Portland, Oregon, United States, is located on the west bank of the Willamette River. It is in the northeastern corner of the southwest section of the city and is where most of the city's high-rise buildings are found....

.

KOIN began in 1925

1925 in radio

The year 1925 saw a number of significant events in radio broadcasting.-Events:*1 January: In Sweden AB Radiotjänst broadcasts its first programme....

 as a radio station

Radio station

Radio broadcasting is a one-way wireless transmission over radio waves intended to reach a wide audience. Stations can be linked in radio networks to broadcast a common radio format, either in broadcast syndication or simulcast or both...

, KOIN-AM (at AM 970). It became part of the Columbia Broadcasting System (CBS), now known as the CBS Radio Network

CBS Radio Network

The CBS Radio Network provides news, sports and other programming to more than 1,000 radio stations throughout the United States. The network is owned by CBS Corporation, and operated by CBS Radio ....

, in 1930

1930 in radio

The year 1930 in radio involved some significant events.-Events:*1 August - The Trémoulet group, owners of Radio Toulouse, buy the private Bordeaux-based radio station Radio Sud-Ouest...

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