22-07-2016, 02:41 PM
Here's a photo so you can have a good laugh at my expense. First attempt at getting colour bars out of it. There are several problems.
No burst. I know from a test point that there's no burst gate either, so an ordinary logic problem. I also think that even if I am doing the burst gate right the burst will be deleted later by some overenthusiastic blanking. Again an ordinary logic problem. I think the PAL switch is working based on what I can see at a test point.
The chroma amplitudes are all over the place. No idea why yet. The yellow bar is huge! The chroma is at 4.43MHz as far as I can tell.
You can't really tell from this picture but I think the luminance amplitudes are largely wrong too. The syncs are correct as they're from the well tested monochrome pattern generator.
Once I have a burst, preferably a proper swinging PAL burst, the picture monitor and vectorscope will start showing me useful information.
No burst. I know from a test point that there's no burst gate either, so an ordinary logic problem. I also think that even if I am doing the burst gate right the burst will be deleted later by some overenthusiastic blanking. Again an ordinary logic problem. I think the PAL switch is working based on what I can see at a test point.
The chroma amplitudes are all over the place. No idea why yet. The yellow bar is huge! The chroma is at 4.43MHz as far as I can tell.
You can't really tell from this picture but I think the luminance amplitudes are largely wrong too. The syncs are correct as they're from the well tested monochrome pattern generator.
Once I have a burst, preferably a proper swinging PAL burst, the picture monitor and vectorscope will start showing me useful information.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
