The formula for the resonant frequency of a circuit shows that the same frequency will always be obtained as long as the product of the inductance (L) and capacitance (C) is constant. The relation between the two for a fixed frequency is called the L/C ratio.
When the frequency is known, and either the inductance or the capacitance is known, you can calculate the unknown quantity using the LC Constant Calculator. The inductance or capacitance required for resonance at any frequency is given by the equation:
L = Inductance in microhenrys (µH)
C = Capacitance in picofarads (pF)
F = Frequency in megacycles (Mc) or megahertz (MHz)