high-frequency temperature-compensated crystal oscillator
HFO High Frequency Oscillator
high frequency crystal filter
High Frequency High Voltage Power Supply
high frequency oscillator
high-frequency high-power excitation source
High-frequency High-voltage
High-Frequency High-Voltage Power Supply
high-frequency high-voltage transformer
high-frequency oscillator
UHFO (Ultra-High-Frequency Oscillator)
ultra-high frequency oscillator
very-high-frequency oscillator
high frequency high fidelity
QCFO Quartz Crystal Frequency Oscillator
quartz crystal frequency oscillator
crystal-controlled oscillator(=crystal oscillator)
(Ultra) high frequency time series
a high frequency and efficiency regeneration syste