Television field scan linearization

Although the design of a field timebase is based on well established principles and theory, there are many points at which there is considerable divergency between the theoretical and practical results. Foremost of these is that of calculating the parameters of linearizing networks, particularly of the feedback type. The present paper examines conventional linearizing methods and it is shown that the deflection current produced is S-shaped under certain conditions. The deflection current demanded by modern wide-angle cathode-ray tubes is of this form and it is shown that by the correct choice of operating conditions conventional linearizing methods can approximate sufficiently close to the desired shape for normal domestic receiver requirements.