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Three Channel 10 MHz Self Calibrating- General Lab Use - Simulcast

Single Channel GPS/GNSS Locked 10 MHz Frequency Reference, OCXO and Self-Calibrating with PPS and NMEA


The NR3623 GNSS locked frequency reference continuously monitors the frequency of the low noise OCXO and disciplines as required. The coefficients are stored in non-volatile memory and in the event of GNSS loss, are used to maintain the accuracy of the crystal. The unit also provides NMEA data and the PPS pulse. PPS amplitude can be either 3.3 or 5 Vdc CMOS (3.3 Volts is standard) with the capability of driving a 50 Ohm load. LED indicators provide GNSS lock status, channel fault and self-test status. There is also a floating solid state relay that can be tied to an alarm panel with lock and self test status.  A good choice for General Lab Use, Simulcast and Test Systems. Low noise option offers lower phase noise.

  • Low phase noise OCXO
  • GNSS lock indicator and built in self test
  • Hold-Over stability of 5 ppb/day, 50ppb/year
  • Self-Calibration minimizes frequency transition during GNSS lock to < 10ppb
  • Locked accuracy < 4E-11

See demo video on YOUTUBE (NR3620)


  • Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) VDC or an AC Adapter
  • PPS Accuracy 20 ns rms
  • Indicators and signals provide GPS Lock and unity self-test status
  • Available in Kit Form (Includes reference, antenna, 50′ cable, and power adapter)

GPSDO Kit available, wide input power range (-60 to +60 VDC)




Frequency References
GPS/GNSS Locked References
AC Powered, DC Powered, Low Noise, NMEA, PPS, 10 MHz, 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.