On negative resistance equalizers for telephone transmission system

Abstract

The paper relates to the application of "negative resistance" and "negative inductance" in the development of attenuation equalizer elements for telephone transmission systems. Non-reactive impedances of the type Z=±ω²(L²/r) are obtained from combinations of positive and negative circuit constants. Attenuation, increasing gradually with frequency, is obtained by connecting an impedance of the type Z=ω²(L²/r) in a circuit containing a source of A.C. power of internal resistance Z₀, a load resistance Z₀, and an additional adjustable resistance r₁ Attenuation, decreasing gradually with frequency, is obtained by connecting an impedance of the type Z=-ω²(L²/r) in a circuit similar to that described above. Resistances r and r₁ control the form of characteristics.