Variable Capacitor Calculator for MW Radio Coil

If you were designing a ferrite rod and coil antenna tank circuit and you had a coil of known value but you needed to calculate the size of the variable capacitor needed, then this calculator will be useful. In this calculator, you enter the medium wave frequency ranges you wish to cover and the coil inductance, and the calculator will find the minimum and maximum values required for the variable capacitor range. The default values show that when the coil is 300 µH, the required variable capacitor must have a minimum value of 32.7 pF and maximum value 304.6 pF in order to have the entire coverage of the medium wave band.

This Article Continues...