CompuServe test bed

CompuServe Thread

Forum unknown · Videophile

#video

9 messages in this thread
#127068From: Mark SloatmanMay 28, 1988 9:10 AM
Sounds like the width has to be decreased. The ST has a horizontal scan of 15769 versus 15734. Sounds like the width is increased to compensate on the ST, so on the Amiga it should be decreased. Which SC1224 do you have ? Power button on volume control or on the front? Mark
#127110From: Henry ColonnaMay 28, 1988 8:16 PM
I have the very original JVC SC1224 (different case than the monochromes.) Great monitor. So you're telling me basically I don't have to worry about some of the reports I've heard that the SC1224 will -always- mess up a bit? You're telling me to shrink the horizontal width when I'm already losing 1 column of letters? Also I have another problem maybe someone can help me with (you too larry!) The picture waves slowly – very slowly. It's gentle, there's no real distortion, but if you look at a straight line, vertically, you can watch it gently wave back and forth. The thing about it is that the entire scan line does that, so it looks like a gentle "rippling effect" on the picture. It doesn't APPEAR to be RFI or anything like that – no TV's, radios, and it happens whether my printer/modem is on/off (no link there). Fortunately it's not real bad – until I notice it, then it's annoying.
#127152From: Don Curtis/SYSOPMay 28, 1988 11:33 PM
Henry, There should be some overscan in the SC1224, shrinking the width will bring the video that's 'off the edge' into view.k The gentle rippling you see is 60Hz beat noise. The slight difference between 60Hz power lines and the vertical sync rate (59.94Hz) can give you that rippling at a .06Hz rate. Don
#127158From: Henry ColonnaMay 28, 1988 11:37 PM
Is there a way to "adjust" or get rid of the rippling? It didn't do it as bad on the A500 at the store – although I must say it was in flourescent lighting, which tends to have such a negative effect on the picture that I just didn't notice it.
#127170From: Don Curtis/SYSOPMay 28, 1988 11:48 PM
Usualy you get the rippling when you have a weak filter in the power supply or a poor ground to the computer. If neither is the case, then there is no adjustment you can perform.
#127170From: Don Curtis/SYSOPMay 28, 1988 11:48 PM
Usualy you get the rippling when you have a weak filter in the power supply or a poor ground to the computer. If neither is the case, then there is no adjustment you can perform.
#127158From: Henry ColonnaMay 28, 1988 11:37 PM
Is there a way to "adjust" or get rid of the rippling? It didn't do it as bad on the A500 at the store – although I must say it was in flourescent lighting, which tends to have such a negative effect on the picture that I just didn't notice it.
#127152From: Don Curtis/SYSOPMay 28, 1988 11:33 PM
Henry, There should be some overscan in the SC1224, shrinking the width will bring the video that's 'off the edge' into view.k The gentle rippling you see is 60Hz beat noise. The slight difference between 60Hz power lines and the vertical sync rate (59.94Hz) can give you that rippling at a .06Hz rate. Don
#127110From: Henry ColonnaMay 28, 1988 8:16 PM
I have the very original JVC SC1224 (different case than the monochromes.) Great monitor. So you're telling me basically I don't have to worry about some of the reports I've heard that the SC1224 will -always- mess up a bit? You're telling me to shrink the horizontal width when I'm already losing 1 column of letters? Also I have another problem maybe someone can help me with (you too larry!) The picture waves slowly – very slowly. It's gentle, there's no real distortion, but if you look at a straight line, vertically, you can watch it gently wave back and forth. The thing about it is that the entire scan line does that, so it looks like a gentle "rippling effect" on the picture. It doesn't APPEAR to be RFI or anything like that – no TV's, radios, and it happens whether my printer/modem is on/off (no link there). Fortunately it's not real bad – until I notice it, then it's annoying.