[DonHopkins]

Who were the other people in Raster Masters, and what crazy stories from Grateful Dead concerts can you tell? ;)

Every time I've ever plugged in a modern projector into a laptop at a presentation it's so stressful, like rolling the dice if the screen will ever come up. What kind of a projector and calibration and preparation did it take to project live hires SGI video onto the screen above the band?

[actionfromafar]

I would guess either https://en.wikipedia.org/wiki/Eidophor or https://en.wikipedia.org/wiki/Talaria_projector https://www.ebay.com/itm/225229726689

https://web.archive.org/web/20250124121654/https://www.ebay....

[DonHopkins]

Wow glad I asked, thanks for the links -- TIL about wobbulators! Definitely on my xmas shopping list for my retro electronics freak friends.

https://en.wikipedia.org/wiki/Talaria_projector

>RGB color separation and processing is obtained using vertical wobbulation of the electron beam on the oil film to modulate the green channel and sawtooth modulation is added to the horizontal sweep to separate and modulate Red and Blue channels. The optical system used in the Talaria line is a Schlieren optic like an Eidophor, but the color extraction is much more complex.

https://en.wikipedia.org/wiki/Wobbulator

>A wobbulator is an electronic device primarily used for the alignment of receiver or transmitter intermediate frequency strips. It is usually used in conjunction with an oscilloscope, to enable a visual representation of a receiver's passband to be seen, hence simplifying alignment; it was used to tune early consumer AM radios. The term "wobbulator" is a portmanteau of wobble and oscillator. A "wobbulator" (without capitalization) is a generic term for the swept-output RF oscillator described above, a frequency-modulated oscillator, also called a "sweep generator" by most professional electronics engineers and technicians.[1] A wobbulator was used in some old microwave signal generators to create what amounted to frequency modulation. It physically altered the size of the klystron cavity, therefore changing the frequency.

Samwell & Hutton Ruggedized CT501 Wobbulator (1968) NSN: 6625-99-620-2403

https://www.ebay.com/itm/267012403603?_skw=wobbulator&itmmet...