A 300- to 4,000-Kilocycle Electrically Tuned Oscillator

An oscillator is described whose frequency is electrically controllable over a 13-to-1 frequency range. Tuning is accomplished by saturation of a ferromagnetic core in the inductance of the tank circuit. The output is constant in amplitude to within 4 per cent and is reproducible in frequency to better than 0.1 per cent.