10 MHz Frequency References – OCXO, TCXO and Rubidium Based. GNSS-Locking Provides Long-Term Stability

Novus offers a range of GNSS GPS disciplined oscillators and related reference products. While our most  popular frequency reference is 10MHz, many of our products are available at 50 and 100 MHz. Unique frequencies are available as well. Novus references can be OCXO , TCXO or Rubidium based. GNSS-locking enhances long-term stability.  Stability options are available that incorporate vibration and thermal isolation. Our reference products are available in 19 inch rack mount and modular, chassis.  Our miniature PicoPod series fits almost anywhere.  Novus reference distribution amplifiers offer minimal phase noise contribution and skewing.  Novus PPS sources can be synchronized to a 10 MHz reference to provide a complete timing solution.  Our PPS sources can be directly from a GPS PPS source or processed to improve jitter and statistical accuracy. For GNSS denied environments,  Novus offers a range synthesized 1PPS sources.   Our PPS distribution amplifiers offer sub 1 nsec skewing and transient and fault protection. For enhanced control and monitoring, SNMP and local control are available as options. Portable reference products offer excellent holdover stability to provide accuracy in GNSS denied environments.

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10 MHz Low Phase Noise with Stabilized PPS NR6720-O/G/A6

10MHz Frequency Reference,  GNSS Locked, Low Close-In Phase Noise  with Stabilized 1PPS

Locked Synthesized 1PPS has <1ns p-p Jitter


The NR6720-O/G/A6 features extremely low frequency jitter despite being GNSS-locked. GNSS-locking brings a long-term stability to an OCXO that is difficult to match. Instead of an accuracy of 50 ppb/year – accuracies of ~E-12 are readily achieved. However, locking an OCXO to the GNSS presents its own set of problems. The timing information from the GNSS is burdened with all the noise one would expect from a RF link – multi-path, reflections, etc. Long-term stability is enhanced frequently at the expense of “close-in” stability. Low frequency components from the RF link are introduced to the OCXO, often degrading the Allan Deviation of the OCXO. The NR6720-O/G/A6 uses a unique crystal and proprietary control loop to minimize “close-in” degradation while securing long-term stability. The unit also features very low 1PPS pulse-to- pulse jitter. Instead of the +- 10 ns of PPS jitter from the receiver, the PPS stabilizer reduces PPS jitter to under 800 ps.

  • Holdover stability of 5 ppb/day,  50ppb/year.
  • LVDS port available for either 1PPS or 10 MHz
  • PPS stability option- P-P jitter < 800 ps.
  • Locked accuracy <4E-11.
  • Available -60 to +60 Vdc in three ranges or AC power adapter
  • Concurrent reception of GPS and GLONASS.
  • PPS accuracy 15 ns @ 1 sigma
  • Secondary channel synthesized frequency.
  • Indicators and signals provide GPS/GNSS lock and unit self-test status.
  • NMEA available via RS232 port.
  • PPS CMOS port can drive 50 Ohm
  • 10MHz transient and fault protected

Brand : Novus          SKU : NR6720-O/G/A6

Typical Phase Noise

NR6720 HS PN table



GNSS Locked Frequency References
AC Powered, DC Powered, Auto Calibration, NMEA, PPS, 10 MHz, done, GNSS Locked , Modular Chassis

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    GPS DO Kits are available that include antenna, cables and power supply. Several features can be customized at the factory – frequencies other than 10 MHz either from a unique crystal or with a built-in synthesizer that is GNSS-locked. Time stamping capability to 100ns resolution. To meet unique requirements, we have shipped product with output features requiring a custom amplitude, square wave output, high voltage and high current drive.