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- Nominal_power abstract "Nominal power is a measurement of a mediumwave radio station's output used in the United States. AM broadcasters are licensed by the Federal Communications Commission to operate at a specific nominal power, which may be (and usually is) different from the transmitter power output. For non-directional stations, nominal power is normally equal to the RF power presented to the antenna, as determined from the base current and the antenna's nominal impedance at the carrier frequency. For directional stations, nominal power is normally equal to the RF power at the common point (the point at which the transmitter output branches off into separate phasing networks for each tower).In both cases, nominal power excludes losses in transmission lines between the tower or phasor and the transmitter; however, it includes losses in a resistor network used to decrease the efficiency of the antenna system.Nominal power is ultimately a historical artifact of the regulatory regime employed by the FCC prior to the 1980s. In the old system, rather than allowing licensees to choose any power level which would meet the efficiency and interference standards for their class, stations were restricted to a small set of power levels: 50, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, and 50000 watts. A station whose maximum coverage would otherwise be available at 4500 watts (given a specific directional pattern and antenna system efficiency) had a choice of either living with 2500 watts, or reducing the antenna efficiency to a level which would allow for 5 kW. Newly-constructed stations could fairly easily design an antenna system to meet the requirements, but stations on or moving to a shared tower with higher efficiency had a problem. The resistor network exception was created to allow stations to reduce their antenna efficiency without having to modify the existing tower.Rule changes in the 1980s did away with the fixed set of power choices, allowing stations to choose an appropriate power level for their antenna system (\"dial-a-power\"), so there should no longer be any need for the concept of nominal power. However, stations still take advantage of the resistor exception in some cases, simply because they perceive the marketing advantage of higher power (or at least \"round\" power) to be worth the cost of the wasted energy.".
- Nominal_power wikiPageID "1461643".
- Nominal_power wikiPageLength "2905".
- Nominal_power wikiPageOutDegree "24".
- Nominal_power wikiPageRevisionID "706569771".
- Nominal_power wikiPageWikiLink Carrier_wave.
- Nominal_power wikiPageWikiLink Category:Broadcast_engineering.
- Nominal_power wikiPageWikiLink Category:Power_(physics).
- Nominal_power wikiPageWikiLink Common_point.
- Nominal_power wikiPageWikiLink Directional_antenna.
- Nominal_power wikiPageWikiLink Effective_radiated_power.
- Nominal_power wikiPageWikiLink Electric_current.
- Nominal_power wikiPageWikiLink Electrical_impedance.
- Nominal_power wikiPageWikiLink Federal_Communications_Commission.
- Nominal_power wikiPageWikiLink Interference_(communication).
- Nominal_power wikiPageWikiLink Medium_wave.
- Nominal_power wikiPageWikiLink Network_analysis_(electrical_circuits).
- Nominal_power wikiPageWikiLink Omnidirectional_antenna.
- Nominal_power wikiPageWikiLink Phasing_network.
- Nominal_power wikiPageWikiLink Phasor.
- Nominal_power wikiPageWikiLink Power_(physics).
- Nominal_power wikiPageWikiLink Radio_frequency.
- Nominal_power wikiPageWikiLink Radio_station.
- Nominal_power wikiPageWikiLink Real_versus_nominal_value.
- Nominal_power wikiPageWikiLink Transmitter_power_output.
- Nominal_power wikiPageWikiLink Ultra_high_frequency.
- Nominal_power wikiPageWikiLink United_States.
- Nominal_power wikiPageWikiLink Very_high_frequency.
- Nominal_power wikiPageWikiLink Watt.
- Nominal_power wikiPageWikiLinkText "High-powered".
- Nominal_power wikiPageWikiLinkText "Nominal power".
- Nominal_power wikiPageWikiLinkText "nominal power".
- Nominal_power wikiPageWikiLinkText "power".
- Nominal_power wikiPageWikiLinkText "transmitter power".
- Nominal_power wikiPageUsesTemplate Template:Reflist.
- Nominal_power wikiPageUsesTemplate Template:Unreferenced.
- Nominal_power subject Category:Broadcast_engineering.
- Nominal_power subject Category:Power_(physics).
- Nominal_power hypernym Measurement.
- Nominal_power type Company.
- Nominal_power comment "Nominal power is a measurement of a mediumwave radio station's output used in the United States. AM broadcasters are licensed by the Federal Communications Commission to operate at a specific nominal power, which may be (and usually is) different from the transmitter power output. For non-directional stations, nominal power is normally equal to the RF power presented to the antenna, as determined from the base current and the antenna's nominal impedance at the carrier frequency.".
- Nominal_power label "Nominal power".
- Nominal_power sameAs m.034_4j.
- Nominal_power wasDerivedFrom Nominal_power?oldid=706569771.
- Nominal_power isPrimaryTopicOf Nominal_power.