R&D Report 1975-24 : Prototype equipment to measure co-channel interference on 625-line television signals. M.J. Kallaway
This report describes prototype equipment designed to measure the level of co-channel interference (CCI) on a 625-line television signal. The CCI measuring equipment's primary application is at transmitters fed by re-broadcast links (RBL) where it would measure the level of CCI on the incoming television signal and record it on a chart recorder. The CCI measuring equipment can distinguish between CCI sources with different frequency offsets between wanted and interfering carriers and so in many cases can identify the interfering sources. The report discusses in detail the fundamental and instrumental limits on the performance of the CCI measuring equipment. The report concludes that this equipment should be able to measure levels of CCI close to the limits of perceptibility. There are, however, some limits to performance which can be assessed accurately only after extensive field trials. When these field trials are complete, it is hoped that the prototype equipment will form the basis for a production model.
