Gustard C18 Master Clock

GUSTARD C18 MASTER CLOCK

The Gustard C18 is a high-precision 10MHz external master clock designed for digital audio components with compatible reference-clock inputs. Built around a custom SC-cut oven-controlled crystal oscillator (OCXO), it provides a stable external frequency reference for DACs, digital interfaces and other supported Hi-Fi equipment.

PRECISION SC-CUT OCXO

The C18 uses a temperature-controlled SC-cut crystal oscillator to maintain stable operating conditions and reduce frequency variations. Gustard specifies frequency accuracy better than ±0.3ppm, frequency stability better than ±50ppb and typical phase noise of -110dBc at a 1Hz offset. This architecture is intended for applications where clock stability and low close-in phase noise are important.

FOUR 10MHZ BNC OUTPUTS

Four BNC connections provide simultaneous 10MHz reference-clock outputs for compatible equipment. The outputs are arranged in two groups, each with independently selectable 50Ω or 75Ω impedance. This allows the C18 to distribute a common reference to multiple devices while accommodating different clock-input requirements.

DISCRETE CLASS A POWER SUPPLY

The oscillator and clock distribution stages are supported by a dedicated internal power supply using discrete Class A regulation. This low-noise power architecture is designed to maintain stable operating conditions for the clock circuitry without relying on an external switching power adapter.

INTEGRATION WITH DIGITAL AUDIO SYSTEMS

The C18 is suitable for Gustard DACs and digital interfaces equipped with compatible 10MHz BNC inputs, as well as selected equipment from other manufacturers. Output impedance, signal level and reference-clock requirements should be checked before connection. The C18 supplies a clock reference only; it does not transmit music data or replace a DAC, streamer or digital transport.

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