Goto Section: 73.14 | 73.23 | Table of Contents
Revised as of December 4, 2012
Goto Year:2011 |
§ 73.21 Classes of AM broadcast channels and stations.
(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. A Class B station is an unlimited time station
which is designed to render service only over a primary service area.
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 141 mV/m at 1 km) 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 141 mV/m at one km. 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]
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Goto Section: 73.14 | 73.23
Goto Year: 2011 |
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