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| Re: Remember TV Test Patterns? (252412) | |||
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Re: Remember TV Test Patterns? |
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Posted by tracksionmotor on Tue Oct 9 21:59:14 2007, in response to Re: Remember TV Test Patterns?, posted by SelkirkTMO on Tue Oct 9 20:12:19 2007. Color wheel had to be as least twice as large of the kinescope diameter......so cabinet for a 14" could have accomodated a 30" kinescope. The technology after the RCA system was not lost, used for medical video cameras. After Mercury B/W spacecraft television transmissions there was a demand for more color TV. Sony system 'Trinitron' where a kinescope had just one electron gun and camera had just one vidicon had yet to be implemented. NASA could not apply a three vidicon camera aboard the Gemini spacecraft due to size and power requirements so they used the CBS 'colorwheel' in face of a B/W vidicon......translation time to NTSC took seven seconds beyond transmission time so that what you saw and heard had to be adjusted for a mixed-delay.First color TV transmission coast to coast of record was by AT&T in 1928 with President of US. It was a Nipkow disk system using a colorwheel on multiple telephone wire lines. Look up 'Early Television.com' as if it up and running had a few examples of the equipment and transmissions like Baird and Jenkins. I'm still looking for the first video players on the internet...they used a 78RPM record AFSK modulating a special neon bulb with a Nipkow disk reflecting into a ground glass screen. BTW: My mother wrote up all the AT&T order circuits for PICTUREPHONE including those at the 1963/64 Worlds Fair on isolated circuits....took eight twisted pair lines for one video....they were outside of the AT&T nationwide coaxial network that was used for TV. TV was always live until AMPEX introduced the 2" videotape...changed everything. BBC was one of the first users...they taped 'Dr. Who' and discovered they could erase and re-record...losing early broadcasts. PROJECT JENNY RULES........'Good Morning VietNam.' Peter, ex HF engineer, WB2SGT |
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