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

10 MHz Low Close-In Phase Noise with Stabilized PPS



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 PPS 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 PPS 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


Typical Phase Noise

NR6720 HS PN table



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

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    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.