The Pendulum High-Stability GPS-12R/HS Portable Frequency Reference clocks are ultra-stable, low-noise, GPSdisciplined Rubidium references, and ideal reference sources and calibrators for both telecom instrumentation and general lab equipment. Thanks to the internal battery option, you can transport near-Cesium frequency stability to the f ield without losing accuracy.

• GPS-controlled Rubidium clock for near-Cesium stability
• Internal battery option for transportation and mains-free field use
• Switchable 1.544 MHz (T1) or 2.048 MHz (E1) front-panel outputs for telecom
• 1 PPS/10 MHz square wave frontpanel output
• 3x 10 MHz and 1x 5MHz sine rearpanel outputs for lab bench and test systems (house standard)
• 1, 5 & 10 MHz optional low-noise sine outputs for general lab use (rear panel)
• GPS-12 Monitor, Control and Monitoring SW