Xref: utzoo sci.electronics:10669 rec.video:11167 Path: utzoo!attcan!uunet!ogicse!decwrl!ucbvax!bloom-beacon!eru!luth!sunic!mcsun!ukc!tadtec!tjfs From: tjfs@tadtec.uucp (Tim Steele) Newsgroups: sci.electronics,rec.video Subject: SCART/Peritel Problem Message-ID: Date: 17 Mar 90 12:22:57 GMT Sender: tjfs@tadtec.uucp (Tim Steele) Distribution: sci, rec Organization: Tadpole Technology plc Lines: 38 A Problem: I have a JVC (well, it says Ferguson on the front but it's JVC inside!) video recorder (model FV37H, though that doesn't help) with a thing called a VPT Adapter which decodes Teletext and allows on-screen programming. The VPT adapter has a SCART/Peritel connector. My TV (Ferguson 51G3) has a SCART input. The VPT will either generate composite video or RGB. When set to composite, it outputs +12v on CV Enable, and composite video on CV (pin 20). When set to RGB, it outputs +4.5v on RGB Enable, RGB on the appropriate three pins and *composite video* on pin 20. When RGB Enable is high, the TV expects to see RGB and *sync only* on pin 20. The SCART input board relies on this! Result: plug them together & you get a double screen image in RGB mode. Yecch. I have tried inserting a diode in the CV line, anode towards TV. Surprisingly this generates a perfect picture... for about 1 second. After that, the sync breaks up. There is a large electrolytic each side of the SCART cable (one in the TV, one in the VPT) which are presumably charging up & moving the threshold. Any suggestions for a fix gratefully accepted! Bye for now Tim -- tjfs@tadtec.uucp ..!uunet!mcvax!ukc!tadtec!tjfs Tadpole Technology plc, Titan House, Castle Park, CAMBRIDGE, CB3 0AY, UK Phone: +44-223-461000 Fax: +44-223-460727 Telex: TADTEC G