This article is about tv expertise. For historic causes, some nations use a special video system on UHF than they do on the VHF bands. In just a few international locations, most notably the United Kingdom , television broadcasting on VHF has been completely shut down. Observe that the British 405-line system A, in contrast to all the other methods, suppressed the upper sideband slightly than the decrease—befitting its status as the oldest operating tv system to survive into the color period (although was never formally broadcast with colour encoding). System A was examined with all three shade systems, and manufacturing tools was designed and ready to be built; System A might need survived, as NTSC-A, had the British authorities not decided to harmonize with the remainder of Europe on a 625-line video normal, carried out in Britain as PAL-I on UHF only.
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