HF Bootstrap


At HF frequencies, the Bootstrap oscillator provides unprecedented low-g sensitivity to 2e-11/g. The Bootstrapping technique uses two rugged phase-locked crystal oscillators to compensate the effects of vibration. The difference-voltage generated by changes in the phase locking voltage of the phase lock loop due to vibration, is applied to both oscillators to minimize the vibration effects. The HF oscillators are available at fixed frequencies from 10 MHz to 25 MHz with noise floors to -165 dBc/Hz. No additional phase noise degradation is observed from 5 Hz to 100 Hz, where normal vibration isolation systems will create a noise peak. An internal vibration isolation system may be added internally, which increases the phase noise below 50 Hz, but improves the noise to better than 2e-12 at 200 Hz and beyond. This approach has been used in demanding rotary wing applications. The Bootstrap oscillator assembly is an ideal solution for the airborne and mobile applications, and is especially useful for shipboard applications where the noise excitation levels are very low frequency. An Ultra-Low Noise oscillator may be locked to the HF Bootstrap output to improve the phase noise under vibration and still provide -175 dBc/Hz noise floors. The Bootstrap assembly is housed in a 6.75″ x 5.0″ x 3.44″ machined aluminum housing. An internal voltage regulator provides excellent power supply line rejection.


  • Frequencies from 10 MHz to 25 MHz, fixed
  • Ruggedized for Dynamic Environments
  • Standard or Premium Phase Noise Options
  • Effective G-Sensitivity to ≤ 5E-11/g per axis
  • Internally Vibration Isolated Version Available with Effective G-Sensitivity to 5E-12/g (2 kHz)


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

Typical Specifications

HF Bootstrap Typical Specs (2)

Mechanical Drawing

HF Bootstrap mechanical (2)

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