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Single Channel 10 MHz OCXO Reference NR3700-O

Single Channel 10 MHz Frequency Reference, OCXO Based


The NR3700 reference uses a low noise SC cut OCXO as the master timing source. The OCXO is biased with a band-gap reference to provide excellent temperature and and aging stability.  LED indicator provides self-test status. There is also a floating solid state relay that can be tied to an alarm panel self test status.

The NR3700 contains a factory programmable counter. The OCXO is typically 10 MHz and is firstly tripled to 30 MHz. The 30 MHz signal drives a 16 bit match counter enabling a the synthesis of a range of frequencies that are integer divides of the 30 MHz The output is available on the SMA as a CMOS signal at 5 Vdc or 3.3 Vdc  CMOS capable of driving a 50 ohm load.


The unit also has a LVDS option.

  • Low phase noise OCXO
  • Hold-Over stability of 5 ppb/day, 50ppb/year
  • Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) VDC or an AC Adapter
  • Indicators and signals provide self-test status
  • Internal 16 bit Match counter drives CMOS and/LVDS





Frequency References
OCXO References
AC Powered, DC Powered, Low Noise, 10 MHz, done, OCXO

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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.