| 11. | Information was transmitted via high-power frequency modulation.
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| 12. | The coil carries rated continuous power frequency currents, therefore this is the power inductor in this system.
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| 13. | For example, a copper foil or screen RF shield will be minimally effective against power frequency magnetic fields.
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| 14. | Near the end of life, fluorescent lamps can start flickering at a frequency lower than the power frequency.
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| 15. | These fuses open in less than one cycle of the AC power frequency; circuit breakers cannot match this speed.
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| 16. | The Rome-Sulmona was the line for an experimental traction phase of 10, 000 volts and 45 Hz power frequency.
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| 17. | The Euroloop frequency was moved to a centre of 13.54750 MHz ( exactly half of the Eurobalise power frequency ).
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| 18. | The Independent Broadcasting Community relaunched Contact on a low-power frequency 106 MHz, before settling with its current frequency of 88.1 MHz.
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| 19. | The impedance of a line trap is very low at the power frequency and will not cause any significant voltage drop.
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| 20. | At the time, efficient high-power frequency conversion was expensive and heavy, so using standard 50 Hz mains power was the only practical system.
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