Medium wave (MW) is a part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the daytime, reception is usually limited to more local stations, though this is dependent on the signal conditions and quality of radio receiver used. Improved signal propagation at night allows the reception of much longer distance signals. This can cause increased interference because on most channels multiple transmitters operate simultaneously worldwide. In addition, amplitude modulation (AM) is often more prone to interference by various electronic devices, especially power supplies and computers. Strong transmitters cover larger areas than on the FM broadcast band but require more energy and longer antennas. Digital modes are possible but have not reached momentum yet.
A clear-channel station is a North American AM radio station that has the highest level of protection from interference from other stations, particularly from nighttime skywave signals. This classification exists to ensure the viability of cross-country or cross-continent radio service enforced through a series of treaties and statutory laws. Known as Class A stations since the 1983 adoption of the Regional Agreement for the Medium Frequency Broadcasting Service in Region 2, they are occasionally still referred to by their former classifications of Class I-A, Class I-B, or Class I-N. The term "clear-channel" is used most often in the context of North America and the Caribbean, where the concept originated.
A non-directional beacon (NDB) or non-directional radio beacon is a radio beacon which does not include inherent directional information. Radio beacons are radio transmitters at a known location, used as an aviation or marine navigational aid. NDB are in contrast to directional radio beacons and other navigational aids, such as low-frequency radio range, VHF omnidirectional range (VOR) and tactical air navigation system (TACAN).
WSB is a commercial AM radio station in Atlanta, Georgia. It airs a talk radio radio format, simulcast on Doraville-licensed WSBB-FM. WSB is the flagship station for Cox Media Group; in addition to WSB and WSBB-FM, it owns three other Atlanta radio stations and Atlanta's ABC Television Network affiliate, WSB-TV. From 1939 to 2019, WSB was owned by Cox Enterprises along with the Atlanta Journal-Constitution daily newspaper; the station had been established by the Journal in 1922. The station's studios and offices are located at the WSB Television and Radio Group building on West Peachtree Street in Midtown Atlanta, which is shared with its television and radio partners.
KKOB is a commercial AM radio station, licensed to Albuquerque, New Mexico and owned by Cumulus Media. Its news/talk format is branded as "96.3 Newsradio KKOB", reflecting a simulcast with co-owned KKOB-FM 96.3 MHz. Studios and offices are located in Downtown Albuquerque. KKOB is the oldest station in New Mexico and is the state's primary entry point for the Emergency Alert System.
KXLY is a commercial AM radio station in Spokane, Washington. It broadcasts a news/talk radio format with the branding "920 News Now". The station is owned by QueenB Radio, with its license held by Morgan Murphy Media.
WBAP is an AM news/talk radio station licensed to Fort Worth, Texas, and serving the Dallas-Fort Worth Metroplex. WBAP is owned by Cumulus Media and broadcasts with 50,000 watts from a transmitter site in the northwest corner of Mansfield. Its programming is also simulcast on WBAP-FM (93.3) in Haltom City.
The extended mediumwave broadcast band, commonly known as the AM expanded band, refers to the broadcast station frequency assignments immediately above the earlier upper limits of 1600 kHz in International Telecommunication Union (ITU) Region 2, and 1602 kHz in ITU Regions 1 and 3.
WOAI is a commercial AM radio station in San Antonio, Texas, which airs a news/talk format. It is owned and operated by locally based iHeartMedia, Inc., and is that company's flagship station. Studios are located in the Stone Oak neighborhood in Far North San Antonio. Its non-directional antenna transmitter site is off Santa Clara Road in Zuehl, Texas.
The North American Regional Broadcasting Agreement refers to a series of international treaties that defined technical standards for AM band (mediumwave) radio stations. These agreements also addressed how frequency assignments were distributed among the signatories, with a special emphasis on high-powered clear channel allocations.
KGNC is an AM radio broadcast station in Amarillo, Texas, United States with a news/talk format. The station is owned by Alpha Media LLC. Studios for KGNC and its partners are located in southwest Amarillo near the former Western Plaza shopping center. KGNC's programming is also broadcast on 97.5 FM by translator K248DE in Amarillo.
The Federal Radio Commission's (FRC) General Order 40, dated August 30, 1928, described the standards for a sweeping reorganization of radio broadcasting in the United States. This order grouped the AM radio band transmitting frequencies into three main categories, which became known as Clear Channel, Regional, and Local. It also included provisions for coordination with Canadian station assignments. The majority of the reassignments resulting from the plan's implementation went into effect on November 11, 1928.
KTRH is a commercial radio station licensed to Houston, Texas. It airs a news/talk radio format and is owned by iHeartMedia, Inc. Its studios are along the West Loop Freeway (I-610) in the city's Uptown district. The transmitter site, a four-tower array, is in unincorporated Liberty County, off Cox Road in Dayton. KTRH is one of the oldest radio stations in the United States, first licensed to Austin on April 22, 1922. Programming is also heard on co-owned KODA's HD 2 subchannel at 99.1MHz, and on the iHeartRadio platform. KTRH is Southeast Texas' primary entry point station for the Emergency Alert System.
ABC North and West SA is a local radio station based in Port Pirie, South Australia, owned by the Australian Broadcasting Corporation. Its callsign is 5CK and is transmitted on the AM band from high power transmitters situated near Crystal Brook.
ABC Gold Coast is an ABC Local Radio station. Based in the suburb of Mermaid Beach, the station broadcasts to the Gold Coast and surrounding hinterland in Queensland, covering as far south as Byron Bay in New South Wales.
Copies of the World Radio TV Handbook have identified 1584 kHz as a local frequency, akin to the Class C radio stations in North America which are limited to 1kW.
4RN is the callsign for the Australian Broadcasting Corporation's Radio National station in Brisbane, Queensland. The station operates at a frequency of 792 kHz.
The following radio stations broadcast on AM frequency 1215 kHz: