Detailed analysis of 3rd-harmonic tuning of television horizontal-deflection circuit

A detailed mathematical analysis of the operation of the television horizontal-deflection circuit is carried out. The amount of oscillatory ringing in the scanning process is expressed by functions of the components in a lossless equivalent circuit. The fault in the customarily presumed 2.8th-harmonic tuning method is clearly shown with examples, where the ringing oscillations are supposed to be suppressed by the previous methods. A principle is presented to obtain favourable conditions for resonance frequencies to decrease underisirable ringing oscillations in the scanning process and to increase the high flyback pulses in the flyback process. Some numerical calculations based on this method are carried out.