HF Citrine PLO


The HF Citrine PLO is a 10 MHz to 25 MHz fixed frequency rugged OCXO integrated with a low noise phase lock loop circuit. The PLO offers excellent aging and temperature stability (when free-running), Standard or Premium phase noise options and low g-sensitivity (to 1E-10/g per axis). Frequency dividers are used to prescale the internal HF oscillator and the external reference frequencies to phase lock at a common lower frequency. The PLL loop bandwidth is typically ≤ 1 Hz, but can be configured for optimal performance considering the reference signal provided. Designed for demanding applications, the HF Citrine PLO provides excellent phase noise performance under vibration with both hard mount and a vibration isolated version available. The hard mount nickel-plated machined aluminum package is 2.25” x 2.25” x 1.3”. An internal voltage regulator is provided for excellent power supply line rejection. Please consult the factory if you need any specifications to be modified to better suit your application.


  • Frequencies from 10 MHz to 25 MHz, fixed
  • Standard or Premium Phase Noise
  • Ruggedized for Dynamic Environments
  • PLL Loop Bandwidth as low as 1 Hz
  • Low G-Sensitivity to 1E-10/g per axis
  • Excellent Temperature Stability
  • Low Aging Rate
  • Vibration Isolated Version Available


  • Military Applications
  • Airborne, Ground, Shipboard
  • Radar Systems
  • Tactical Radio
  • Vehicular Communication
  • Reference Source

Typical Specifications

HF Citrine PLO Typical Specs

Mechanical Drawing

HF Citrine PLO mechanical

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