07-12-2020, 01:17 AM
OK last post before sleep, have got the Image size better, with the DG7-5.
Here is a question for the thinkers, Please let me know where I am going wrong.
The spec of the DG7-5 says line size is 0.7mm, I would say that is the worst, and it could be better.
If the line timebase is 98.8uS long and the line blanking was 17.5uS then we have 81.3uS per line of video.
If the maximum video bandwidth visible on the CRT is limited by the dot size then the fastest video would be with a dot first on and then off, with these two levels being spaced by the dot size.
With each dot at 0.7mm then one cycle would be 1.4mm. With a visual line width of only 60mm on the screen which equates to the 81.3 uS. Then 1.4mm would equate to (1.4/60) x 81.3 uS = 1.897 uS in time period which is a frequency of 527148 Hz. If I can see the 1 MHz grating does that mean the dot size is around 0.37mm at least, or am I thinking to digitally?
Adrian
Here is a question for the thinkers, Please let me know where I am going wrong.
The spec of the DG7-5 says line size is 0.7mm, I would say that is the worst, and it could be better.
If the line timebase is 98.8uS long and the line blanking was 17.5uS then we have 81.3uS per line of video.
If the maximum video bandwidth visible on the CRT is limited by the dot size then the fastest video would be with a dot first on and then off, with these two levels being spaced by the dot size.
With each dot at 0.7mm then one cycle would be 1.4mm. With a visual line width of only 60mm on the screen which equates to the 81.3 uS. Then 1.4mm would equate to (1.4/60) x 81.3 uS = 1.897 uS in time period which is a frequency of 527148 Hz. If I can see the 1 MHz grating does that mean the dot size is around 0.37mm at least, or am I thinking to digitally?
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
