Vertical interval signals on 405

[ppppenguin]

Since we are using 405 converters to feed a variety of sets from 1936 to the late 1960s that's a very good reason not to have VITS on their output. What practical use is it anyway? Unless you're monitoring a trasnsitter network or a substantial CATV installation they don't have any use at all. The Dulwich Museum system may well be the largest 405 distribution system now in existence. I can't see any use for VITS in that. If we had any awkward problems we could use full screen test signals, a lot easier than strobing out the VITS line(s) on a high performance waveform monitor.