47 C.F.R. § 73.21

Classes of AM broadcast channels and stations

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(a) Clear channel. A clear channel is one on which stations are assigned to serve wide areas. These stations are protected from objectionable interference within their primary service areas and, depending on the class of station, their secondary service areas. Stations operating on these channels are classified as follows:

(1) Class A station. A Class A station is an unlimited time station that operates on a clear channel and is designed to render primary and secondary service over an extended area and at relatively long distances from its transmitter. Its primary service area is protected from objectionable interference from other stations on the same and adjacent channels, and its secondary service area is protected from interference from other stations on the same channel. (See § 73.182). The operating power shall not be less than 10 kW nor more than 50 kW. (Also see § 73.25(a)).

(2) Class B station. Class B stations are authorized to operate with a minimum power of 0.25 kW (or, if less than 0.25 kW, an equivalent RMS antenna field of at least 107.5 mV/m at 1 kilometer) and a maximum power of 50 kW, or 10 kW for stations that are authorized to operate in the 1605-1705 kHz band.

(3) Class D station. A Class D station operates either daytime, limited time or unlimited time with nighttime power less than 0.25 kW and an equivalent RMS antenna field of less than 107.5 mV/m at 1 kilometer. Class D stations shall operate with daytime powers not less than 0.25 kW nor more than 50 kW. Nighttime operations of Class D stations are not afforded protection and must protect all Class A and Class B operations during nighttime hours. New Class D stations that had not been previously licensed as Class B will not be authorized.

(b) Regional Channel. A regional channel is one on which Class B and Class D stations may operate and serve primarily a principal center of population and the rural area contiguous thereto.

Note:

Until the North American Regional Broadcasting Agreement (NARBA) is terminated with respect to the Bahama Islands and the Dominican Republic, radiation toward those countries from a Class B station may not exceed the level that would be produced by an omnidirectional antenna with a transmitted power of 5 kW, or such lower level as will comply with NARBA requirements for protection of stations in the Bahama Islands and the Dominican Republic against objectionable interference.

(c) Local channel. A local channel is one on which stations operate unlimited time and serve primarily a community and the suburban and rural areas immediately contiguous thereto.

(1) Class C station. A Class C station is a station operating on a local channel and is designed to render service only over a primary service area that may be reduced as a consequence of interference in accordance with § 73.182. The power shall not be less than 0.25 kW, nor more than 1 kW. Class C stations that are licensed to operate with 0.1 kW may continue to do so.

[56 FR 64856, Dec. 12, 1991, as amended at 81 FR 2759, Jan. 19, 2016]

Notes of Decisions

Cited in 10 cases, 1965–2009 · leading case: Wait Radio, a Co-P'ship v. Fed. Commc'ns Comm'n, Midwest Radio-Television, Inc., Intervenors, 459 F.2d 1203 (D.C. Cir. 1972).

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Wait Radio, a Co-P'ship v. Fed. Commc'ns Comm'n, Midwest Radio-Television, Inc., Intervenors, 459 F.2d 1203 (D.C. Cir. 1972). · cites it 2× “47 CFR § 73.21 (a). From an engineering point of view, Class I stations may be divided into two groups.”

Nat'l Broad. Co., Inc. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor. Gem State Broad. Corp. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor, 362 F.2d 946 (D.C. Cir. 1966). · cites it 3× “' 47 C.F.R. 73.21(a) 2 'A standard broadcast station transmits two types of signals, a groundwave and a skywave signal.”

United States v. Neely, 595 F. Supp. 2d 662 (D.S.C. 2009). “See 47 C.F.R. §§ 73.21 , 73.99. In the case at hand, the license for Neely’s station WLTC(AM) required it to reduce its transmitter power to specified levels at nighttime.”

City of New York Mun. Broad. Sys. (Wnyc) v. Fed. Commc'ns Comm'n, Wcco Radio, Inc., Intervenor, 744 F.2d 827 (D.C. Cir. 1984). “47 C.F.R. § 73.21 (a)(2) (1983). There are three different types of Class II stations: Classes II-A and II-B stations, which are unlimited time stations broadcasting 24 hours per day, and Class II-D stations, which may broadcast only from sunrise to sunset.”

560 Broadcast Corp. v. Fed. Commc'ns Comm'n, 418 F.2d 1166 (D.C. Cir. 1969). “The Rule provides: “An authorization for * * * [au] increase in facilities of an existing station will be issued only after a satisfactory showing has been made * * * “(3) That a proposed new nighttime operation * * * would * * * provide a first primary AM service to at least 25…”

Nat'l Broad. Co. v. Fed. Commc'ns Comm'n, 362 F.2d 946 (D.C. Cir. 1966). · cites it 3× “” 47 C.F.R. 73.21(a). . “A standard broadcast station transmits two types of signals, a groundwave and a skywave signal.”

Wait Radio v. Fed. Commc'ns Comm'n, 418 F.2d 1153 (D.C. Cir. 1969). “The pertinent rules are found in 47 C.F.R. §§ 73.21 , 73.25, 73.182(a) (1) (i), and 73.”

Rust Broad. Co. v. Fed. Commc'ns Comm'n, 379 F.2d 480 (D.C. Cir. 1967). “565 (1961); see 47 C.F.R. §§ 73.21 , 73.25, 73.182 (1967 ed.”

George Dacre & Henry Edelstein D/B/A Rockland Broad. Co. v. Fed. Commc'ns Comm'n, Rockland Radio Corp., Intervenor, 352 F.2d 647 (D.C. Cir. 1965). “” 47 C.F.R. § 73.21 (b) (1) (1965). 3 . E. g.”

Rust Broad. Co., Inc. v. Fed. Commc'ns Comm'n, 379 F.2d 480 (D.C. Cir. 1967). “565 (1961); see 47 C.F.R. 73.21, 73.25, 73.182 (1967 ed.)”

— 47 C.F.R. § 73.21(a) — 2 cases

Nat'l Broad. Co. v. Fed. Commc'ns Comm'n, 362 F.2d 946 (D.C. Cir. 1966). “” 47 C.F.R. 73.21(a). . “A standard broadcast station transmits two types of signals, a groundwave and a skywave signal.”

Nat'l Broad. Co., Inc. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor. Gem State Broad. Corp. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor, 362 F.2d 946 (D.C. Cir. 1966). “' 47 C.F.R. 73.21(a) 2 'A standard broadcast station transmits two types of signals, a groundwave and a skywave signal.”

— 47 C.F.R. § 73.21(a)(1) — 1 case

Nat'l Broad. Co., Inc. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor. Gem State Broad. Corp. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor, 362 F.2d 946 (D.C. Cir. 1966). “' 47 C.F.R. 73.21(a) 2 'A standard broadcast station transmits two types of signals, a groundwave and a skywave signal.”

— 47 C.F.R. § 73.21(a)(2)(1) — 1 case

Nat'l Broad. Co., Inc. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor. Gem State Broad. Corp. v. Fed. Commc'ns Comm'n, Boise Valley Broadcasters, Inc., Intervenor, 362 F.2d 946 (D.C. Cir. 1966). “' 47 C.F.R. 73.21(a) 2 'A standard broadcast station transmits two types of signals, a groundwave and a skywave signal.”

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