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The 476MHz Master Oscillator provides an RF signal.  This is synchronized with the 360Hz 3-phase power line signal (from the a sequencer chassis) in the VME-based Master Trigger Generator.  The VMTG output triggers the fiducial generator at 360Hz and the .  The 360Hz output of the fiducial generator is combined with amplitude-modulated onto the original 476MHz signal in (2.78ms between peaks, 476MHz frequency) and propagated down the Main Drive Line (MDL).

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