18-06-2021, 07:19 PM
(This post was last modified: 18-06-2021, 07:34 PM by Murphyv310.)
Hi.
Regarding alignment I've actually found that doing the "spot" alignment works reasonably well. The essence is to make sure you follow the instructions to the letter, no short cuts. it's also important to use a signal generator that is accurate and if it's something like an Advance E2 etc these are now bound to be inaccurate so let them warm up and check the output on a frequency counter. Remember that often loading up the generator it can also drift slightly so always double check the injected frequency. Follow the procedure to the letter then see what the result is like.
If you still have ringing or what we call overshoot then try and down load a simple VIT signal It can tell you a lot. You can put it on a stick onto one of those boxes I have linked to and then look at the detected waveform, On sharp changes from Black level to peak white the waveform should be reasonably square with no signs of ringing afterwards, the same should be on the opposite going from peak white to black level. On the pulse there should be no small sine waves after the pulse.
I used to have a 405 line pulse and bar stored but this is on a few computers ago.
You may find that some small adjustments are needed to give the best overall definition without ringing, note where each core is before you have a go and see what the core does on screen, keep the sound up so you can hear if it is effecting the sound channel.
The picture is a 625 line image on a French set, no easy task to get it as good as this!!
This is the 625 line VIT signal.
Regarding alignment I've actually found that doing the "spot" alignment works reasonably well. The essence is to make sure you follow the instructions to the letter, no short cuts. it's also important to use a signal generator that is accurate and if it's something like an Advance E2 etc these are now bound to be inaccurate so let them warm up and check the output on a frequency counter. Remember that often loading up the generator it can also drift slightly so always double check the injected frequency. Follow the procedure to the letter then see what the result is like.
If you still have ringing or what we call overshoot then try and down load a simple VIT signal It can tell you a lot. You can put it on a stick onto one of those boxes I have linked to and then look at the detected waveform, On sharp changes from Black level to peak white the waveform should be reasonably square with no signs of ringing afterwards, the same should be on the opposite going from peak white to black level. On the pulse there should be no small sine waves after the pulse.
I used to have a 405 line pulse and bar stored but this is on a few computers ago.
You may find that some small adjustments are needed to give the best overall definition without ringing, note where each core is before you have a go and see what the core does on screen, keep the sound up so you can hear if it is effecting the sound channel.
The picture is a 625 line image on a French set, no easy task to get it as good as this!!
This is the 625 line VIT signal.
