We all know how a dip meter works and what it measures - the resonance of an LC circuit. The circuit featured here is designed to work in the VHF range. The tester coil is inserted in the LX terminals and placed near the LC circuit to be tested. The variable capacitor C1 is slowly turned until a substantial dip is observed in the meter. The freque
ncy (or the inductance) can then be read on the scale. The scale must be self constructed by using several LC circuits with known values. The fastest way to calibrate the dip meter (or to make the scale) is to use a frequency counter. The tester coil is 2 turns magnet wire. This gives a frequency range of around 50. 150 MHz.