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I may be posting this prematurely as I’m still trouble shooting but maybe someone has already seen this and can provide an answer faster.
Originally I stole a set of RGBHV cables off the LCD projector at work. These are some of the cheapest cables I’ve ever seen, probably built onsite by some AV gurus who specialize in installing LCD projectors in conference rooms for 800x600 computer graphics. They do however work ok and produce a stable picture on my 1271.
This weekend a friend of mine, who is an engineer for one of the national TV stations, sent me a set of HDTV quality RGBHV cables he makes on a regular basis for the station. These cables are made using Belkin 1505a cable which seems to be a fairly decent cable.
I hooked the cables up and after about 45 seconds I noticed the picture starting to go. It was streaking and becoming very unstable. About 20 seconds later the whole picture was rolling. It had completely lost sync.
Troubleshooting so far…
It’s not a bad cable in the set he sent me. It happens if I swap his cables all around.
It does seem to a problem with only the H-sync. If I swap out just the H-sync with the cheap stolen cable then the picture will stay stable for an entire movie.
My guess is there is an impedance problem (not 75 Ohm) on the H-sync but I didn’t have my meter to test. My friend suggested I get a 75 Ohm terminator and T connector and plug that into the H-sync.
What else could this be? Have you seen this before? Could it be a problem with the IFB-11 (iirc I think I have an 11) input board?
Thanks for your guidance.
Originally I stole a set of RGBHV cables off the LCD projector at work. These are some of the cheapest cables I’ve ever seen, probably built onsite by some AV gurus who specialize in installing LCD projectors in conference rooms for 800x600 computer graphics. They do however work ok and produce a stable picture on my 1271.
This weekend a friend of mine, who is an engineer for one of the national TV stations, sent me a set of HDTV quality RGBHV cables he makes on a regular basis for the station. These cables are made using Belkin 1505a cable which seems to be a fairly decent cable.
I hooked the cables up and after about 45 seconds I noticed the picture starting to go. It was streaking and becoming very unstable. About 20 seconds later the whole picture was rolling. It had completely lost sync.
Troubleshooting so far…
It’s not a bad cable in the set he sent me. It happens if I swap his cables all around.
It does seem to a problem with only the H-sync. If I swap out just the H-sync with the cheap stolen cable then the picture will stay stable for an entire movie.
My guess is there is an impedance problem (not 75 Ohm) on the H-sync but I didn’t have my meter to test. My friend suggested I get a 75 Ohm terminator and T connector and plug that into the H-sync.
What else could this be? Have you seen this before? Could it be a problem with the IFB-11 (iirc I think I have an 11) input board?
Thanks for your guidance.