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The DC509 uses reciprocal counting with an internal 100 MHz clock phase-locked to the reference oscillator. | The DC509 uses reciprocal counting with an internal 100 MHz clock phase-locked to the reference oscillator. | ||
An R6504 microprocessor (28-pin variant of a [[6502]] with 8K addressable memory) performs the calculations. | An R6504 microprocessor (28-pin variant of a [[MOS Technology 6502|6502]] with 8K addressable memory) performs the calculations. | ||
Opt.01 is an OCXO for improved stability. | Opt.01 is an OCXO for improved stability. |