Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Cubdriver:
:o Holy crap that's a lot of gear! Very cool!
-Pat
bitseeker:
TEA + 50 years = :o
med6753:
--- Quote from: SeanB on June 09, 2018, 05:38:58 am ---
The rest of the world learnt from the US adoption of the National Television Standards Committee system, mostly in how to improve the very obvious flaws inherent in the system, and how, with only a few years better design experience from the original standard, designed to be compatible with the most common original set designs so as to not make undue interference, and made a few changes that improved stability and colour rendition.
Most obvious was PAL and SECAM mostly removed the "Hue" control, as the colour was a lot more stable both over time and with distortion in the transmission chain. The most impressive improvement prior to the all digital channel was that the designers of the standards managed to fit, in the original 8MHz allocated bandwidth, both colour pictures, analogue stereo audio, digital information ( Teletext) and as well high quality digital stereo audio ( NICAM stereo, which was capable of near CD audio quality, sadly let down by the poor speakers in most sets, being the smallest and cheapest they could fit in the set that would produce sound) which was the final step.
--- End quote ---
When the NTSC standard was adopted in the early 1950's it was limited by the technology available at the time. And once adopted we were stuck with lousy color until the advent of digital. It's sort of the same deal as to why we are stuck with mains voltage of 120V vs the rest of the world 240V.
djos:
--- Quote from: med6753 on June 09, 2018, 06:06:10 am ---
--- Quote from: SeanB on June 09, 2018, 05:38:58 am ---
The rest of the world learnt from the US adoption of the National Television Standards Committee system, mostly in how to improve the very obvious flaws inherent in the system, and how, with only a few years better design experience from the original standard, designed to be compatible with the most common original set designs so as to not make undue interference, and made a few changes that improved stability and colour rendition.
Most obvious was PAL and SECAM mostly removed the "Hue" control, as the colour was a lot more stable both over time and with distortion in the transmission chain. The most impressive improvement prior to the all digital channel was that the designers of the standards managed to fit, in the original 8MHz allocated bandwidth, both colour pictures, analogue stereo audio, digital information ( Teletext) and as well high quality digital stereo audio ( NICAM stereo, which was capable of near CD audio quality, sadly let down by the poor speakers in most sets, being the smallest and cheapest they could fit in the set that would produce sound) which was the final step.
--- End quote ---
When the NTSC standard was adopted in the early 1950's it was limited by the technology available at the time. And once adopted we were stuck with lousy color until the advent of digital. It's sort of the same deal as to why we are stuck with mains voltage of 120V vs the rest of the world 240V.
--- End quote ---
NTSC was a perfectly well designed system for black and white TV... It only fell down a bit when colour was shoe horned into it in such a way as to remain compatible with black and white. It was really quite clever imo.
PAL was a better system because they where able to learn from the flaws in NTSC. However due to our 50hz power systems we had to suffer a 4% speed up to watch film on TV. You guys in the USA instead used 3:2 pull down and got a much nicer result (horizontal planning aside) with no audio pitch issues.
med6753:
One of the first color TV's was the RCA CTL-100 introduced in late 1953 - early 1954. It cost nearly $6800.00 USD in today's money. Looks are deceiving. It was huge. I've seen schematics and construction details of these early sets. The power supply was a separate chassis in the bottom of the cabinet with an enormous power transformer and several 5U4 rectifier tubes to supply the B+. The main chassis consisted of close to 50 vacuum tubes. The CRT was small and round. The bezel cuts off the top and bottom to give the impression it's rectangular. Think Tek 555 dual beam scope with it's huge case and separate power supply and you get the idea of what these early sets were like. And to top it off the picture sucked. :palm:
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