AncientBrit wrote:If you are talking about a 400Hx/12.5Hz directly scanned saticon camera I built one may moons ago.
I wrote it up for the Newsletter.
I found I had to electronically defocus the image since the electon beam was too narrow to fully discharge the scanned raster producing the usual "watering" effect.
Another problem I had with this particular tube was it was(is) very laggy.
Regards,
Graham
gary wrote:LOL nothing new in NBTV...
gary wrote:harry dalek wrote: follow in the foot steps of .... Graham !
and Baird! (maybe in this case Zworykin)
If I see further 'tis because I stand on the shoulders of giants...
Sir Isaac Newton...
AncientBrit wrote:I don't have copies to hand but I'm sure that's the issue Harry.
I don't think anyone else published a similiar project recently in the newsletter.
Cheers,
Graham
The challenge was to see if I could originate 400/12.5Hz pix directly from a pickup tube.
I didn't try any faster scan rates. I was only interested in standard NBTV.
Any other rates would require a standards converter.
If you are going to go down that road you might as well down-convert from a small 625 CCD camera and in fact at one of the NBTV conventions I used such a process to record 400/12.5 pix onto a PC through the parallel port.
AncientBrit wrote:Hi Harry,
No pictures in the newsletter but I'll take a few and post them here.
Cheers,
Graham
AncientBrit wrote:Harry,
I'll look up my circuit for heater volts.
Better to be safe than sorry, apply only 5v if you are not sure.
Use a dropper resistor.
If you are really sure it's 6.3 v then apply the full 6.3v
My tube was a sub miniature one manufactured with colour stripes on the faceplate (Bayer pattern?) so it could be used as a colour pickup.
The pitch is so fine that in my monochrome 32 line use the stripes are not visible or used.
[/quote]Watch your fingers with transformer derived high voltages, they are dangerous!!
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