maybe not an option, but a decent scan-convertor should fix this...

saw a similar problem with the guys on riverdance - running single output 1024x768 75Hz w/Extron scan-convertor to two Barco R18s.

they use black/white strobe for one of the cues. The effect is exactly as Richard describes previously with the DL1s - A very clear banding three-quarters of the way down the image.

I tried every acheivable combination of resolution/refresh-rate. Even tried making the black a very dark blue in case the projector was seeing these frames as a lack of signal???

only way to make it go was to use a Folsom ImagePRO scan-convertor which will happily sit at 200Hz. (As far as I remember, the banding dissapeared at 100Hz)

not sure of your setup there - sounds like you're going 1280x1024 direct into the projectors?

If you're using a scan-convertor, I'd try tweaking there before you make any changes on the G5 - I think your input frequency to the R18s wants to go up instead of down!

Could even be projector problems? If there's a grounding or phasing issue between the signal source and the R18s, it's possible you'll see exactly the same flicker on every projector.

I'm sure you've tried this already, but if it's isolated to individual projectors be sure to try cross-plugging all your inputs in case its something like a convergence problem on the projector, or all your sources to eliminate any scan-convertor issues

Anyway, hope you get to the bottom of it.

Have you had any more problems with the G5s?


Rich Stembridge