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Code of Federal Regulations

Subpart A

AM Broadcast Stations

73.1Scope.73.14AM broadcast definitions.73.21Classes of AM broadcast channels and stations.73.23AM broadcast station applications affected by international agreements.73.24Broadcast facilities; showing required.73.25Clear channels; Class A, Class B and Class D stations.73.26Regional channels; Class B and Class D stations.73.27Local channels; Class C stations.73.28Assignment of stations to channels.73.29Class C stations on regional channels.73.30Petition for authorization of an allotment in the 1605-1705 kHz band.73.31Rounding of nominal power specified on applications.73.33Antenna systems; showing required.73.35Calculation of improvement factors.73.37Applications for broadcast facilities, showing required.73.44AM transmission system emission limitations.73.45AM antenna systems.73.49AM transmission system fencing requirements.73.51Determining operating power.73.53Requirements for authorization of antenna monitors.73.54Antenna resistance and reactance measurements.73.57Remote reading antenna and common point ammeters.73.61AM directional antenna field strength measurements.73.62Directional antenna system operation and tolerances.73.68Sampling systems for antenna monitors.73.69Antenna monitors.73.72Operating during the experimental period.73.88Blanketing interference.73.99Presunrise service authorization (PSRA) and postsunset service authorization (PSSA).73.127Use of multiplex transmission.73.128AM stereophonic broadcasting.73.132Territorial exclusivity.73.150Directional antenna systems.73.151Field strength measurements to establish performance of directional antennas.73.152Modification of directional antenna data.73.153Field strength measurements in support of applications or evidence at hearings.73.154AM directional antenna partial proof of performance measurements.73.155Directional antenna performance recertification.73.157Antenna testing during daytime.73.158Directional antenna monitoring points.73.160Vertical plane radiation characteristics, f(θ).73.182Engineering standards of allocation.73.183Groundwave signals.73.184Groundwave field strength graphs.73.185Computation of interfering signal.73.186Establishment of effective field at one kilometer.73.187Limitation on daytime radiation.73.189Minimum antenna heights or field strength requirements.73.190Engineering charts and related formulas.