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Why do all radio stations start with w?

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They don't. In the west (west of the Mississippi?) they start with K.
Not ALL do. This are applicable only in North America and codes assigned for different types of broadcasting - including commercial radio, and in different regions in North America.
When "radiotelephone" sets began to appear on ocean going ships, the operators pretty much made up their own identifications. As more ships came equipped, this practice soon became a major problem. It was then decided that transmitting and receiving stations be assigned call signs.
When land-based radio stations started up in the early part of the 20th century, the new Federal Radio Commission began to assign call letters- first in alpha-numeric variations (for experimental licensees) and three-and-four letter alpha identifications for commercial operations.
An international conference comprised of the major countries heavily into the development of broadcasting decided that North America would be assigned as follows:
"N" for U.S. Navy stations;
"W" for broadcast stations on the amplitude modulation (AM) band and later on the frequency modulation (FM) band east of the Mississippi River and "K" for those stations west of the river;
"C" would be assigned to stations originating from Canada;
"X" for Mexico
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Why do us eastern radio station names start with W except KDKA KYW and KQV and western station names start with K except WIBW and WHO?

Answer . When the first radio stations applied for licenses, (the ones listed) the government hadn't defined any specific requirements for the assignment. After the first f

Why is a W in radio stations?

  K and W serve as rough geographical identifiers. K stations are in the western US, and W stations are in the east

Why do radio stations start with k?

Back in the 1920s, when there were enough radio stations that  governments   decided it was time to step in and regulate them (to avoid having  their signals   devou

In which decade did the first American radio stations start?

Various hobbyists and electrical nerds were transmitting music and talk, occasionally, without firm schedules, for the entertainment of their neighbors, during the 19-teens.
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Can you give the frequency for all radio stations?

Yes we can. At least for the commercial broadcast stations in the USA. AM stations: Carrier frequencies are at every 10 KHz, between 550 KHz and 1700 KHz. FM stations: Car