L3 coaxial system ¿ Television terminals

Television terminals are required at circuit ends of the L3 coaxial system, at the transmitting end to condition video signals for carrier transmission, and at the receiving end to detect the transmitted signals. Special signal characteristics, that is, a degree of modulation which exceeds the value commonly referred to as 100 per cent modulation, require departures from standard modulating and detecting processes. The high degree of modulation requires both careful control of transmitted wave form and, at the receiver product, demodulation with phase-synchronous carrier (homodyne detection).