NTSC versus PAL
in [Repair]
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From: Dave Plowman (News) on 7 Apr 2010 12:07 In article <hpi7k4$nnh$1(a)news.eternal-september.org>, William Sommerwerck <grizzledgeezer(a)comcast.net> wrote: > >> Setting them up is another matter. The early episodes of > >> "Barney Miller" provide a good example of poor setup, with > >> inconsistent color, and poor convergence. > > Poor convergence? The mind boggles. > Oh, yes. The pickups had to be aligned. The "modern" system, in which > solid-state sensors are attached to a prism/beamsplitter was not > practical with vidicons and Plumbicons. Registration on cameras. Convergence on monitors? Did you have videcon colour cameras? First UK ones were plumbicon. Apart from the ancient IO RCA ones used for tests. -- *24 hours in a day ... 24 beers in a case ... coincidence? * Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: William Sommerwerck on 7 Apr 2010 12:28 > Registration on cameras. Convergence on monitors? Yes. Thanks for the correction. > Did you have videcon colour cameras? First UK ones > were Plumbicon. Yes, because you started so late. The first RCA cameras used vidicons (I think) -- though they might have used image orhticons. They later had a four-pickup camera that used an image orthicon to generate a perfectly registered (by definition) luminance signal, plus three vidicons.
From: Michael A. Terrell on 7 Apr 2010 17:30 William Sommerwerck wrote: > > >> Setting them up is another matter. The early episodes of > >> "Barney Miller" provide a good example of poor setup, with > >> inconsistent color, and poor convergence. > > > Poor convergence? The mind boggles. > > Oh, yes. The pickups had to be aligned. The "modern" system, in which > solid-state sensors are attached to a prism/beamsplitter was not practical > with vidicons and Plumbicons. Local stations weren't immune, either. Some locally produced shows in Dayton, ohio aired from poorly converged cameras in the '70s & '80s -- Lead free solder is Belgium's version of 'Hold my beer and watch this!'
From: Dave Plowman (News) on 7 Apr 2010 18:39 In article <hpibre$pjs$1(a)news.eternal-september.org>, William Sommerwerck <grizzledgeezer(a)comcast.net> wrote: > > Registration on cameras. Convergence on monitors? > Yes. Thanks for the correction. > > Did you have videcon colour cameras? First UK ones > > were Plumbicon. > Yes, because you started so late. > The first RCA cameras used vidicons (I think) -- though they might have > used image orhticons. Three 3 inch IO were the ones I remember. Being used for tests long before colour broadcasting started in the UK. > They later had a four-pickup camera that used an image orthicon to > generate a perfectly registered (by definition) luminance signal, plus > three vidicons. That's a configuration I never saw. The first colour cameras here were all four tube plumblicons. I was taught the colour response of a videcon wasn't suitable. BTW I'm not surprised your setup engineers had problems - with a mixture of IO and videcon. ;-) -- *Santa's helpers are subordinate clauses* Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Michael A. Terrell on 7 Apr 2010 20:26
"Dave Plowman (News)" wrote: > > In article <hpibre$pjs$1(a)news.eternal-september.org>, > William Sommerwerck <grizzledgeezer(a)comcast.net> wrote: > > > Registration on cameras. Convergence on monitors? > > > Yes. Thanks for the correction. > > > > Did you have videcon colour cameras? First UK ones > > > were Plumbicon. > > > Yes, because you started so late. > > > The first RCA cameras used vidicons (I think) -- though they might have > > used image orhticons. > > Three 3 inch IO were the ones I remember. Being used for tests long before > colour broadcasting started in the UK. > > > They later had a four-pickup camera that used an image orthicon to > > generate a perfectly registered (by definition) luminance signal, plus > > three vidicons. > > That's a configuration I never saw. The first colour cameras here were all > four tube plumblicons. I was taught the colour response of a videcon > wasn't suitable. RCA built their TK44 color studio cameras with Vidicons. They changed the model number to TK46 when they switched to Plumicons. Most of the parts were interchangeable, so I used a pair of TK44 cameras for spare modules & as a test jig to keep three TK46 cameras working the way we wanted. The TK44s were used by TV stations for years, but needed brighter studio lighting. -- Lead free solder is Belgium's version of 'Hold my beer and watch this!' |