NTSC versus PAL
in [Repair]
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From: isw on 8 Apr 2010 00:53 In article <510423273edave(a)davenoise.co.uk>, "Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote: > In article <isw-55C6A6.19545706042010@[216.168.3.50]>, > isw <isw(a)witzend.com> wrote: > > In article <4bbbee16$0$24357$c3e8da3(a)news.astraweb.com>, > > Sylvia Else <sylvia(a)not.at.this.address> wrote: > > > --snippety-snip-- > > > > I'm left wondering what exactly was the *real* problem that PAL was > > > intended to fix. > > > Political. The Europeans didn't want US companies selling sets there. > > Didn't stop the Japanese, etc. But *they* wanted to sell sets *here*. Isaac
From: isw on 8 Apr 2010 01:00 In article <hpibre$pjs$1(a)news.eternal-september.org>, "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote: > > Registration on cameras. Convergence on monitors? > > Yes. Thanks for the correction. > > > > Did you have videcon colour cameras? First UK ones > > were Plumbicon. > > Yes, because you started so late. > > The first RCA cameras used vidicons (I think) -- though they might have used > image orhticons. Iconoscope first, then orthicon, then image orthicon. Vidicons were first used for film chains, and later as the color (as opposed to luminance) pickups in *some* cameras. Isaac
From: stratus46 on 8 Apr 2010 01:12 On Apr 7, 5:26 pm, "Michael A. Terrell" <mike.terr...(a)earthlink.net> wrote: > "Dave Plowman (News)" wrote: > > > In article <hpibre$pj...(a)news.eternal-september.org>, > > William Sommerwerck <grizzledgee...(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!' I thought TK-44s had plumbs. I _know_ that TK-45s had plumbs as I have a used one from a TK-45. The TK-28 film camera had vidicons but AIUI, the vidicon had its own level non-linearity that was not present in plumbicons (Leddicons for you EEV fans) or Saticons. Vidicons required different electronic gamma to achieve an overall gamma of 2 to 2.2. For a film camera the vidicon issue wasn't as bad as the light levels were much more predicable. You can look at some of the dinosaurs here. http://www.oldradio.com/archives/hardware/TV/RCA-TV.htm G²
From: Michael A. Terrell on 8 Apr 2010 02:56 stratus46(a)yahoo.com wrote: > > On Apr 7, 5:26 pm, "Michael A. Terrell" <mike.terr...(a)earthlink.net> > wrote: > > "Dave Plowman (News)" wrote: > > > > > In article <hpibre$pj...(a)news.eternal-september.org>, > > > William Sommerwerck <grizzledgee...(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!' > > I thought TK-44s had plumbs. There were conversion kits, according to the manuals I had for the 44s > I _know_ that TK-45s had plumbs as I have > a used one from a TK-45. The TK-28 film camera had vidicons but AIUI, > the vidicon had its own level non-linearity that was not present in > plumbicons (Leddicons for you EEV fans) or Saticons. Vidicons required > different electronic gamma to achieve an overall gamma of 2 to 2.2. > For a film camera the vidicon issue wasn't as bad as the light levels > were much more predicable. That was why you needed more light in the studio for the Vidicons. It pushed them into a more linear area of operation. The savings on lighting costs and air conditioning quickly paid the conversion costs. The ones we had were from a private studio used a few times a year, to make commercials by an eccentric old man. > You can look at some of the dinosaurs here. > > http://www.oldradio.com/archives/hardware/TV/RCA-TV.htm -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida http://www.flickr.com/photos/materrell/
From: Dave Plowman (News) on 8 Apr 2010 04:05
In article <isw-D8D39A.22002707042010@[216.168.3.50]>, isw <isw(a)witzend.com> 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. > Iconoscope first, then orthicon, then image orthicon. Vidicons were > first used for film chains, and later as the color (as opposed to > luminance) pickups in *some* cameras. Are you saying there were iconoscope colour cameras actually in use? Videcon monochrome cameras were used for some types of broadcast in the UK for many a year. Gave very nice pictures with enough light - but didn't cope with fast movement well. -- *Sorry, I don't date outside my species. Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound. |