R&D Report 1956-41 : C.W. interference with television: Its reduction by means of frequency modulation. A.V. Lord, R.V. Vigurs This report has been written as the result of work carried out on a proposal by E.P. Wethey to reduce the visible effect of c.w. interference on a television picture. The proposal relies on the principle that if an interference pattern is broken up by the use of frequency modulation at the transmitter, the protection requirements can be somewhat relaxed. The report describes the experiments carried out, and indicates that under certain restricted conditions an improvement of between 3 and 5 dB can be obtained, but that in general the method would not be advantageous.