High-power television-transmitter technique, with particular reference to the transmitter at Holme Moss

摘要

Performance requirements for television transmission are discussed in relation to reliability. Modulating systems are reviewed, and it is concluded that high-level modulating systems are to be preferred where the choice of system exists. The design features of a current 50-kW transmitter are discussed with special reference to shunt-regulated amplifiers, pulse stabilization methods and black-level control. Overall performance figures are quoted. Transmitter testing requirements are discussed, and a case is made for a controlled shape of step signal for transient testing and for the use of very-low-frequency testing for overall system appraisal.