Mixer-Oscillator Considerations for Nuvistors in the VHF Band

The over-all performance obtained from a television tuner in the very-high-frequency range depends to a large extent upon the characteristics and performance of the mixer tube. In addition to its principal function of transposing the rf signal down to the if by injection of the locally generated heterodyne frequency, the mixer used in this range makes a definite contribution to the over-all gain, and has an important bearing on the requirements of the rf amplifier.