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Rubidium 10 MHz Frequency References 

Rubidium references, unlike a mechanical resonant system, is based upon an atomic transition for core timing. As a result, temperature, aging, positional stability are all dramatically improved over an OCXO. A Rubidium source offers a holdover stability that is typically 50 times better than an OCXO ( 1 ppb/year versus 50 ppb/year). For those references with a PPS option we offer holdover stability options to 1 usec/day. Our basic products are the NR2110-R and NR2310-R Rubidium frequency references which offer excellent stability at a moderate price. Atomic reference phase noise levels may not be acceptable for many applications. To provide a stable low noise source, a low noise OCXO is incorporated that is disciplined to the Rubidium reference. This results in a low noise, high stability reference (NR2110-R/O, NR2310-R/O). For applications demanding even better long-term stability, we offer GNSS disciplined 10 MHz references that offer the long-term stability of GNSS disciplining, low noise of a high performance OCXO and short-term stability of Rubidium (NR2110-R/O/G, NR2310-R/O/G, NR8403-RO).


Sub Categories

Atomic Multi-Output References 

 Combining a distribution amplifier with the frequency reference uses less rack space and is a lower noise  reference- it is also typically more cost effective.

Ultra Low Noise Reference

The phase noise for a standard Rubidium source is not acceptable for some applications. Our low noise Rubidium frequency reference incorporates a low noise OCXO that is locked to the Rubidium source. This combination gives you the best of two technologies - the stability of Rubidium and the low noise of an OCXO

Single Channel References

Basic rackmount Rubidium reference 0.5 E-10/month aging. A cost effective timing solution when GPS is not available.

Atomic GNSS Locked References

GNSS disciplined references use timing information from the GNSS to synchronize a local reference. Long-term accuracy on the order of E-12 is common. The GNSS oscillator can be crystal or atomic with a wide range of performance options depending upon the specific requirement. A range of configurations are available from PCB assembles that can be easily embedded into a system, to rack mount units with up to ten channels. Self-calibrating references essentally eliminate long-term drift by storing the current calibration coefficients for the 10 MHz OCXO in FLASH memory (see demonstartion video). Kits are available complete with the selected GNSS locked source, antenna, power supply and cable - everything you need to have a fully operational source. GNSS locked oscillator products are considered to be frequency standards by NIST (NIST white paper)

Modular Reference

The NR8403 reference operates from -60 to +60 Vdc in three ranges. Available as a 3 channel reference with optional low noise and GNSS locking. It also features stabilized PPS and NMEA with the GNSS Option. Front panel display provides local control.


nr8403 ra4 2

SKU: NR8403-OG

NR8403- Rubidium Frequency Reference

10 MHz Reference has 3 sine and 3 PPS and 2 LVDS outputs
SKU: NR8403-OG

NR3606- Six channel GNSS Locked Frequency Reference- Three channels of Sine and Three Channels of PPS and two LVDS Channels