Hi Gary
Well if that is the case I find it hard to explain it unless there is some sort of delay in the electronics - damn long delay though.
Looking at the pasted paper over that position the top line does have a little overlap i think due to the fact the encoder is smaller than the nipkow part so at that point the difference in sizes is made up in the overlap ...i think ! i can cut it smaller but the line pule will be wider ...all the white slots line up to the nipkow holes ...
Do you mean the vertical bar that rolls horizontally or the rolling of the sync bar (picture)? I haven't seen any of your tests yet that doesn't have the vertical bar that scrolls across.
The vertical bar i was thinking its the frequency of the torch but then why isn't it in the sweep sync adjustment tests they look clean ..?
Well the bottom of the sync bar will be flat only because that's the trigger for the start of the line - but the top of the sync bar will be jagged NOT because of the sync width (which IS fine BTW) but because your disk speed is varying - if you look at your wave files WITHOUT sync processing you will see the sync bar being a great wavy thing - this is disk speed variation - something you haven't addressed yet.
Ok gary getting ahead of my self but looked like again i did a better job on the sweep tests .
There is SLIGHT jaggedness on both sides of my avi's because the time base correction has changed the length of the sync pulse to make all lines in the video signal the same length (i.e. correcting the line length variation due to speed variations). But I can only do this to a 1 pixel resolution without greater oversampling (perhaps I should do that actually).
This sounds like another problem for the crystal motor control its cause you a lot of work to correct the lines .
Yes I think it must be something external as it is at none of the internal frequencies - but it is much lower now than it used to be.
I will track it down but i know i have forgotten to switch off the lap tops PS so i hope its just that !
Yes, that's the first time I have actually recognised it - so that's a big step forward.
Yes its easy for me as i know what i did so i know what to look for i need the distance i was doing stuff to close ,you viewer is a big help asi can line it up so at least i know the distance is right .
And yes, NBTV work is good for us... keeps us off the street
Not me i am still looking for a old microwave oven ; )
And anyway, I think you are now one of a surprisingly small number of NBTVA members who have created a recognisable TV picture mechanically - well done!
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Gary when i took this on i was thinking this was easier than a monitor but theres a bit to it your advice has made it easier!!!!but well worth the build more i try more i like it as we have talked about i have the camera bug now to.
The getting an image you can work out poor as my attempts are for me its really thrilling and i just want to do better more i play with it .