Between 1976 and 1981 when French channel TF1 was switching area by area to the new analog 625-lines UHF network with SECAM colour, some transmitters and gapfillers broadcast the 819-line signal in UHF. When switching to 625-lines, most gapfillers did not change UHF channel (e.g.
Between 1976 and 1981, French channel TF1 was transitioning from analog to digital 625-line UHF network with SECAM color, some transmitters and gapfillers broadcast the 819-line signal in UHF. When switching to 625 lines, most gapfillers did not change their UHF channel.