| ICDX Table of Obsolete TV Systems | ||||||||
| System. | # of Lines. | Vertical scan rate(Hz) | Channel bandwidth (Mhz). | Video bandwidth (Mhz). | Sound/Video spacing (Mhz). | Video Modulation (+/-). | Sound Modulation (AM/FM). | Where used. |
| A | 405 | 50 | 5 | 3 | -3.5 | Positive | AM | UK (VHF) Closed 1985. |
| E | 819 | 50 | 14 | 10 | +\-11.15 | Positive | AM | France, Monaco (VHF) Discontinued early 1980's. |
| F | 819 | 50 | 7 | 5 | -5.5 | Positive | AM | France, Monaco (VHF) Not known to have been used. |
| ? | 441 | 50 | ?? | ?? | ?? | ?? | ?? | Pre WW2, Known to have been used in Germany, France, USA and former USSR (VHF). |
| Baird | 240 | 50 | ? | ? | ? | ? | ? | UK (Low VHF). Prewar system, alternated weekly with EMI 405 line system. used non-interlaced mechanical scanning. Bandwidth would have been similar to 405 lines (Sys A). |
| Note: The 240 line system was developed by John Logie Baird and began as a low resolution 30 line system using a "Nipkov" scanning disc at 12.5 frames per sec, later Baird developed a "Mirror drum" which allowed his "Televisor" to display 240 lines. At the time it was not possible to tell the difference between the 240 and 405 line systems. The Baird system mainly failed due to the cameras being unable to produce pictures in sunlight and requiring powerful studio lights. Baird built an outside braodcast camera using a cine camera, developing system and telecine in a cumbersome box. The 4 minute delay was not acceptible however. | ||||||||