GPS frequency reference enables atomic clock stability

22nd January 2015
Nat Bowers


Delivering a frequency accuracy of less than ±1E-12 after a period of 24 hours stable satellite signal lock, IQD’s IQFR-100 high precision GPS frequency reference provides stability levels similar to those of much more expensive caesium atomic clocks.

Operating in conjunction with a GPS or Compass satellite signal, the IQFR-100 maintains a high stability in the event of signal failure by virtue of the high performance internal OCXO. In the event of a loss of signal, the unit maintains an accuracy of better than 5E-11 until restoration of lock due to the internal reference oscillator.

Designed for comms systems, power grid references, national defence equipment and smart metering, the IQFR-100 provides various output interfaces including two 10MHz square wave outputs and two square wave outputs at 2.048MHz (both with an accuracy of less than 1E-12), and two 1PPS impulse outputs with a holdover specification of less than or equal to 1.5µs in the event of the loss of the satellite signal.

Operating over a temperature range from -20 to +60°C, the IQFR-100 consumes less than 7W of power whilst operating from a standard 220VAC supply line. In the event of a power outage failure at the mains source, an internally rechargeable battery switches in to maintain system stability performance prior to restoration of the supply. The various outputs are presented via back panel BNC connectors in addition to a standard aerial connector. Various front panel LED lights indicate lock of the satellite signal as well as system fault conditions.

The IQFR-100 will be launched by IQD at Stand 640 in Hall 1 at Embedded World 2015.

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