exciter

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exciter

[ek′sīd·ər]
(electricity)
A small auxiliary generator that provides field current for an alternating-current generator.
(electronics)
A crystal oscillator or self-excited oscillator used to generate the carrier frequency of a transmitter.
(electromagnetism)
The portion of a directional transmitting antenna system that is directly connected to the transmitter.
A loop or probe extending into a resonant cavity or waveguide.