In modern terminology, this would include random (thermal and shot) noise but those concepts were relatively unknown and little understood at the time despite an early paper by Schottky in 1918 on shot noise.
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Initially, the baseband pass range used was 200 Hz to 2500 Hz but later the International Telecommunication Union set a standard of 300 Hz to 3.4 kHz with 4 kHz spacing.
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Campbell had previously utilised the condition discovered in the work of Oliver Heaviside for lossless transmission to improve the frequency response of transmission lines using lumped component inductors (loading coils).
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