Antennas: More on the Grid Dip Oscillator (GDO)

摘要

A very useful item of test equipment when working with antennas and tuned circuits is the Grid Dip Oscillator, generally known as a GDO. For newcomers who may not know of this device, it is used for measuring the resonance of tuned circuits and antenna elements without actually connecting the instrument to the circuit under test.rnWhen a tuneable oscillator is placed close to a nearby resonant circuit, some of the oscillator power is absorbed when the oscillator is tuned to the same frequency. Some indication of oscillator energy loss is can be used to indicate this condition.