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Master frequency generator
Master frequency generator: In frequency-division multiplexing (FDM), equipment used to provide system end-to-end carrier frequency synchronization and frequency accuracy[?] of tones.
Note: The following types of oscillators are used in the Defense Communications System[?] FDM systems: Type 1 - A master carrier oscillator as an integral part of the multiplexer set. Type 2 - A submaster oscillator equipment or slave oscillator equipment as an integral part of the multiplexer set. Type 3 - An external master oscillator equipment that has extremely accurate and stable characteristics. Synonym master oscillator.
Source: from Federal Standard 1037C and from MIL-STD-188
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