Moderators: Dave Moll, Andrew Davie, Steve Anderson
Steve Anderson wrote:The first issue I've run into with my idea/concept above is the additional capacitance of the 1-2m umbilical added to what the deflection amplifiers and the grid/cathode drive arrangement have to cope with.
This shouldn't be a problem for the 5ADP7 which will generally be used at SSTV rates. But for the 5ADP1 I had planned for a 128x128 50Hz usage which requires around 4-500kHz of video bandwidth and much faster sweep rates from the timebases/deflection amps. That's incompatible with the extra few hundred (probably) pF added by the umbilical. So it appears that the 'remote CRT cases' will have to have some active electronics inside, but an absolute bare minimum.
More thought required...
Steve A.
Steve Anderson wrote:I suspect that was used as a 625 monitor, the time-constants in the deflection amps are way too short for SSTV. There also is no form of sub-carrier demodulation. And the use of a P1 CRT is a clue too.
No idea why two stages of differential amps are used for both X and Y deflection.
The CRT is run at quite low voltages, it must have been quite dim.
I also came across this some years back and I don't recall the item mentioning SSTV, I've lost the link since then...
Steve A.
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