On the nature of negative resistances and negative resistance sections

The paper is in two parts. Part I. relates to comparative studies of "stability," "value and nature of impedance," "linearity," and "phase-distortion" made on dynatron, transitron, and feed-back types of negative resistance element for the frequency range 0·5 kc/s to 1·0 Mc/s. "Amplification Effect," " Band-pass Effect," and negative resistance equalizers have been explained on the basis of the above studies. Part II. shows the (a) negative resistance (impedance) sections as two-way amplifiers, and (b) negative resistance (impedance) sections as two-way ampli-filters. It has been found that to obtain amplification, the impedance in the shunt must essentially be negative, and, in addition, to obtain filter action, either series or shunt impedance must be of the square type. Properties and applications of the sections have been discussed