Some remarks on the radio-frequency phase and amplitude characteristics of television receivers

The influence, on the picture of the steady state characteristics of the radio frequency part of a television receiver is considered especially for the frequencies close to the carrier frequency (the so-called Nyquist flank). It follows from numerical calculations that the shape of the amplitude characteristics of this Nyquist flank has but little influence on the picture quality. The performance of a receiver will be substantially the same in combination with a double-side band transmitter as with a vestigial-sideband transmitter, provided the latter has been compensated for its own phase errors. The performance of a vestigial-sideband transmitter should be monitored with a phase-linear receiver, of which the exact shape of the Nyquist flank is not very critical.