Dual Pulsed-Pilot-Carrier ALC For Temperature And Color Stability Of CATV Signals (1970)
By O. D. Page And P. E. Treynor, Entron, Inc.
Automatic level control is required in any CATV system of appreciable length, due to changes in cable attenuation with temperature. Temperature-sensing and single-and dual-CW -pilot-carrier control are discussed 1 and compared with pulsed or modulated pilot carrier control methods. Pulsed or modulated pilot carrier control is found to be superior 1 and gives much more stable output levels as amplifier circuitry is subjected to extremes of temperature. Also, ColorBeat interference between pilot carrier and video carrier is eliminated through use of a synchronized pulse generator in the head-end.
By clicking the "Download Paper" button, you are agreeing to our terms and conditions.