Sorry to bump an incredibly old thread - but was this ever solved? I tried using the EL1883 to separate the sync signals, but I don't get any picture when I use the horizontal sync output and get a shaky picture when I use the composite sync output for the horizontal sync. Is it possible to use the 1883 for 31khz signals, or is the EL4583 or likewise a better choice? If so, are there schematics or wiring diagrams out there for using the EL4583 to split the sync at 31khz?