T1 10MHz Time Reference

  1. General
  2. Features
  3. Options
  4. Specifications

Timing in digital systems is the key to carry and to faithfully convert digital audio content. Why so? Let’s imagine that a digital to analog converter chip is fed from a clock containing a high level of phase noise, otherwise known as jitter in the time domain. Instead of being evenly spaced in time, the digital audio information converted to the analog domain is spread randomly around the ideal time, introducing undesired artifacts. The better the clock source, the lesser the phase noise, the more precise the conversion.

An ultra-low phase noise, high accuracy 10MHz oven controlled oscillator (OCXO) forms the heart of the T1, CH Precision’s first clock generator.


• 10MHz nominal frequency
• Square wave: 1V or 500mV peak to peak, selectable
• Sine wave: 1V or 500mV peak to peak, selectable
• 6 outputs, 75Ω BNC coaxial
• Transformer-coupled outputs
• Independant control for each output


• GPS input to suit the CH Precision GPS option
• 1 pulse per second (1 PPS) TTL input for external synchronization
• Ethernet for remote control (CH Control App)
• USB for firmware upgrade

Power Supply

• Dedicated ultra low noise, three-stages discrete regulated linear power supplies for each section
• Galvanically isolated power supplies for the OCXO, the OCXO buffer and the output buffers
• Magnetically and electrostatically shielded toroidal mains transformer


• OCXO fitted inside a heavy aluminum block for improved core temperature stability
• OCXO aluminum block mounted on soft silicon gel for maximum damping
• Power transformer mounted on silent blocks

To avoid the inexorable drift in time of oscillators, a GPS option is available. Locking on satellites’ ultra-stable caesium clocks, it ensures that the T1 will perform identically today and for many years to come.

Nominal frequency 10MHz, +/-20ppb typical, factory adjusted
Tuning range +/-1ppm via 1PPS input
External 1PPS Input
Input level 100mV to 5V peak to peak
Input impedance 75Ω, BNC coaxial connector
10MHz Outputs
Output level 1V or 500mV, peak to peak, loaded with 75Ω termination, adjustable for each output
Waveform type Sine or Square wave, adjustable for each output
Output impedance 75Ω, 6x BNC coaxial connectors
Display 480x272 pixels, 24bits color, AMOLED
Mains operation Selectable 100V, 115, 230V AC, 47-63Hz
Power supply consumption <1W (standby), 100W max in operation
Dimensions/Weight 440 x 440 x 133mm (W x D x H), 26kg
Remote control

Ethernet based system control via the Android CH Control App


Adobe-PDF-Document-icon Product flyer (preliminary)
Adobe-PDF-Document-icon User manual
Compressed-File-Zip-icon T1 firmware version 1.2a (release date 2017/09/07)
androidapp CH Control Android Application