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Very high frequency
A VHF ocsillator is a very high frequency ocsillator (30-300MHz). It oscillates (swings back and forth) at a VHF frequency.
VHF - Very high frequency
Very High Frequency.
VHF = "Very High Frequency"
Formally, radio frequencies from 30 MHz to 300 MHz.
(Wavelengths between 1 meter and 10 meters)