Can you elaborate on how you did this on a QL or give a picture. Does this allow you to attach it to a composite TV input perhaps video camera input or one of those SCART adapters?Technical-Chap wrote:As I do on all old British computers from the eighty's and early ninety's I put a simple PNP amp circuit, this gives a colour composite output on most machines, some need a bit more work or the signal inverting.
The way TC was talking I thought the QL composite wasn't a standard PAL signal. Surely the signal before the modulator is much better than adding all the degradation of the RF signal processing especially through the old TV. My QL video plug is wired for a 20" tube RGB & sync monitor I had so I probably remember that as the quality of picture I last saw from the QL.bwinkel67 wrote:You don't need to do that on the QL, as it already provides that on the RGB connector.
Nope, it gives a standard PAL signal, all you need is to create the cable.Ruptor wrote:The way TC was talking I thought the QL composite wasn't a standard PAL signal.
I spend many hours and had lots of questions on this forum trying to figure out why I couldn't get a crisper color composite signal and the consensus I got from those that have played with it longer is that the QL color composite isn't going to get better. Now granted, the RF signal is actually pretty good so I'm not complaining, but the color composite just isn't that much better (at least that was for me and I'm in the US so maybe the US RF modulator just does a better job). That being said, the monochrome composite is a ton better, maybe because it doesn't have to deal with the interference needed to add color. But the color composite isn't bad it just has the usual artifacts (and with my RF being so good I was just disappointed it couldn't be better).Ruptor wrote:Surely the signal before the modulator is much better than adding all the degradation of the RF signal processing especially through the old TV. My QL video plug is wired for a 20" tube RGB & sync monitor I had so I probably remember that as the quality of picture I last saw from the QL.
Ok thanks that makes things easy. If you are in America how come you have Composite PAL colour output I thought I read US units only had monochrome. I suppose you might have an EU unit since monitors don't know where they are and sync to anything but I wonder if the 60 Hz instead of 50 Hz might make things worse.bwinkel67 wrote:Nope, it gives a standard PAL signal, all you need is to create the cable.
The US models do only have monochrome composite output on pin 3. For whatever reason, pin 1 just gives a 5 volt signal (no one has been able to answer why). I mod'ed mine to grab pin 9 off of the MC1377 chip to go to pin 1 with a switch so I only need one cable to give me both color and monochrome composite (otherwise you need two cables with one using pin 1 and one using pin 3) and I can switch between the two. I could have grabbed the signal right from the modulator but didn't think of it, but that signal comes from pin 9 of the chip so it ends up being the same. I did have to add a 47 ohm resistor to clean up the picture as the color was washed out otherwise (likely not the case had I grabbed it directly from the input of the RF modulator as I bet there was a resistor somewhere in place that cleaned things up--dunno). But my composite signal is the same as the RF now color-wise with maybe a tad less interference but with all the artifacts you get using composite color.Ruptor wrote:Ok thanks that makes things easy. If you are in America how come you have Composite PAL colour output I thought I read US units only had monochrome. I suppose you might have an EU unit since monitors don't know where they are and sync to anything but I wonder if the 60 Hz instead of 50 Hz might make things worse.
