Klaas Robers wrote:Harry, because the scannings are running free, you should be able to adjust for a square scanning field. So reduce the horizontal scanning width and expand the vertical scanning heighth. They should be comparable, such that you get a square scanning field. Then adjust the horizontal sawtooth frequency to 16,6 Hz, that is 60 msec for one line, and the vertical scanning duration to 7,2 sec. Then at least your scanning is running at the correct speed. After you have done that synchronisation becomes much easier.
But first it is time to finish the video amplifier and connect that to the picture tube. Then at least you can see something from known SSTV signals and for implementing the synchronisation it is needed that you can see what happens. So the sync separator comes after the video chain working.
Hi Klass i did try on my control trimmers .
I am going to have to look into whats up in the vertical and horizontal adjustment side such as the width control the horizontal has position control as i have slight width control to the line ...the vertical has a position control and width control but they are much less weaker than the horizontal side ...if i swap the deflection yoke coils visa versa the the horizontal is much smaller and the vertical is longer .
Just to make sure ...my horizontal as in the past posting is using the the 41 ohm coil and the vertical 15 ohm...i will try a few ideas to match the scan line length width to get the correct aspect ratio /
I have not made a sync circuit yet but i do have Steves working demodulator from 6 month back waiting to be used here...i have made the video amp circuit top circuit with a high voltage trany i had handy and with my tube focus and brightness wiring bottom schematic ...
I need to do as you suggest and get the scanning line widths ratio right right so i will work on that .
viewtopic.php?f=8&t=2080&start=60i just found reducing the 5ohm resistor on the deflection coil circuit increased the vertical deflection by twice the amount ...i need to reduce the horizontal deflection still way to high for this .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.