10 MHz Low Phase Noise OCXOs for NASA Space Missions

Published on February 21, 2026

Introduction : In deep space exploration, specifically for missions involving Synthetic Aperture Radar (SAR), the quality of the scientific data is directly tied to the precision of the frequency reference. SAR systems rely on phase coherent signal generation over long intervals to create high resolution topographic maps and surface analyses.

Any frequency instability or “jitter” (phase noise) from the local oscillator translates into image blur, reduced radiometric accuracy, and phase errors. For NASA missions like the EnVision spacecraft’s Venus Synthetic Aperture Radar (VenSAR), a specialized 10 MHz Oven Controlled Crystal Oscillator (OCXO) is required to withstand the harsh journey to Venus while maintaining terrestrial grade precision.

There are other applications such as VSAT system output transmitted toward satellite also relies on OCXO crystal used in transmit chain. Satellite systems do rely on highly stable 10 MHz OCXO used in RF transceiver.

Product Spotlight: Wenzel Associates 10 MHz VenSAR OCXO

Wenzel Associates (part of the Quantic family) has engineered a 10 MHz OCXO specifically for the NASA/ESA VenSAR instrument. This oscillator is designed to serve as the timing foundation for planetary imaging.

Key features

• Ultra low phase noise : -105 dBc/Hz at 1 Hz offset & -164 dBC/Hz at 10 KHz offset
• SC-Cut quartz resonator : inherently less sensitive to thermal gradients and mechanical stress.
• Thermal management: Employs proportional heater controllers that maintain stable internal temperature environment, minimizing the frequency drift caused by the extreme temperature swings of space flight.
• G-sensitivity : Designed with a specialized mounting structure to minimize the effects of external vibration and launch-phase acceleration.

Space Qualification requirement

Unlike commercial OCXOs, space-qualified units must meet rigorous standards such as NASA EEE-INST-002. The Wenzel 10 MHz unit undergoes:

• Radiation Hardening: Components are selected based on resistance to Total Ionizing Dose (TID) and Single Event Effects (SEE) to ensure predictable behavior over the mission’s life.
• Thermal Vacuum Testing: Verifies the oven regulation and stability in a vacuum, where heat must be managed solely through conduction.
• Pyroshock and Vibration: Validates that the internal crystal and wire bonds can survive the violent forces of a rocket launch and stage separation.
• Extended Aging Tests: Characterizes frequency drift over months to validate long term predictability for a mission that may take years to reach its destination.

Reference: Visit Quantic Wenzel website for more information.

Comparative Guide : Other low phase noise ocxos

While Wenzel Associates is a primary provider for high end NASA radar missions, several other manufacturers provide space grade 10 MHz frequency references as mentioned in the following table.

Conclusion

For next generation planetary missions, the 10 MHz OCXO is more than just a component; it is the heartbeat of the radar system. By choosing high stability references, mission architects can ensure that our views of distant planets like Venus are as clear and detailed as possible.