Terry Harvey wrote: >The definition of Kell Factor is the number obtained by dividing the raster >pitch distance by the width of the picture resolution elements. > No, it is not. The common definition of the Kell factor is the reduction in vertical resolution from the number of scanning lines (although, in the age of fixed-pixel displays, it has also been applied to the reduction in hirizontal resolution from the number of active samples per line). >Recall that system A was developed in 1935/36, before Kell and others >discovered that the interlaced vertical resolution was not ideal. > Kell did his work in the early 1930s, before System A was broadcast. I have extensively researched Kell's work. I would suggest that you look up the Proceedings of the IRE. TTFN, Mark ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.