What is a Variable Frequency Oscillator (VFO) || How to Construct a Variable Frequency Oscillator

Describes what is meant by a variable frequency oscillator or VFO. Also explains about the different types of VFO, the electrical characteristics, parts of a VFO and the various applications. Also demonstrates the method that I construct a variable frequency oscillator. Thanks & 73 Lesley Paul VJ, VU2LVJ