Pendulum GPS-12R/12RG Portable GPS/ Glonass-controlled Frequency Standards

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• Traceable internal calibration system approved by SP (Swedish National Testing and Research Institute) • No calibration cost – ever • Remote monitoring via Ethernet interface • Cesium stability – at Rubidium price • No doubt about accuracy, display of frequency offset • Standard frequencies for telecom, calibration and test systems

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Pendulum GPS-12R/12RG Portable GPS/ Glonass-controlled Frequency Standards


Accuracy, High-Stability and Performance

The GPS-12R family of frequency standard offers traceable Cesium-like stability at a very attractive price. Synchronized to the GPS satellite system, the GPS-12R provides both short and long–term high time and frequency stability, assuring precision and accuracy. 

Very high long-term frequency stability is provided from the built-in Cesium-controlled standards in the GPS-satellites, ensuring zero ageing of frequency reference over time. Very high short-term stability comes from a disciplined low-noise built-in Rubidium atomic clock. 

The use of a Rubidium atomic clock ensures a minimal phase drift during Hold-over (if contact with GPS satellites are lost). 

We offer the following models: 

  • GPS-12R/HS – GPS-controlled High-performance Rubidium frequency reference
  • GPS-12RG – As GPS-12R/HS, but with Glonass/GPS-controlled



Where AC Mains voltage is not available, the internal battery operation provides oscillator stability during transportation or for mains-free field applications. This feature is ideal for telecommunications requirements such as SDH/PDH/SONET Analyzers, wireless base stations, broadcast field stations or mobile units, or public utility field applications where lightweight portability with zero warm-up time and full stability is essential. 


Unlike other blank-front-panel instruments that demand a remote PC interface to control and monitor the operation, the GPS-12R family has an intuitive user-friendly front-panel operation. Menu selections are made on the large graphic LCD screen, and all relevant instrument status like time and position, satellite data etc. can be displayed. To further enhance the ease-of-use, the menu is selectable in 7 different languages, including Russian, Chinese, and Japanese. 

An optional PC SW enables also remote control and monitoring of all GPS-12x menu functions. 


As an in-house reference standard for calibration or as the master clock for test instruments, the GPS-12R family provides a continuous stable and accurate frequency standard. Together with optional 1, 5, 10 MHz outputs, it is the ideal precision reference standard for use in; metrology, radar antenna array systems, public utilities, and the electronics industry. The optional battery provides increased efficiency of the GPS-12R family when transportation between workstations is required. 

For precise time synchronization and editing of Digital Video Broadcasting/Digital Audio Broadcasting systems; broadcasters and post-production facilities look to the GPS-12R to deliver the ultra-stable master clock required to sync SMPTE time-code generators. 

Standard configuration includes outputs for low-noise 10MHz sine (3x), 5MHz sine (1x), switchable 1.544 MHz or 2.048 MHz (2x), and switchable 10 MHz pulse/1-pps time reference (1x). Optional input/outputs include 1, 5 and 10 MHz outputs for metrology purposes, E1/T1 clock and data outputs for telecom, and input for external 1-pps disciplining. The ultra-stable, built-in Rubidium atomic clock oscillator offers excellent frequency and time stability, whether in GPS-disciplined mode, or in hold-over mode. Configurable alarming provides easy to read urgent and not-urgent alarms for loss of GPS, loss of antenna connection, hardware failures, and more. User settings and display are selectable for seven languages. 

GPS-12RG Portable GLONASS/GPS Rubidium Frequency Standard

The Pendulum GPS-12RG Portable Reference clock is an ultra-stable GLONASS and GPS-disciplined Rubidium reference, targeted for both metrology and telecommunications applications. The combined use of GPS and Glonass satellite constellation, ensures improved satellite visibility, especially important in urban areas where tall buildings may obstruct the sky view.