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"...Replacing Test Card F"

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I know Test Card F was used on ITV in the early/mid 70s but I'm not sure it's correct to say that ETP-1 "replaced" F on ITV. I watched the Thames TV startup a lot of times as a nipper in the late 70s - before ETP-1 was unveiled in '79, Thames generally broadcast colour bars in the mornings. These were shown with a deep tone and then a few minutes before opening time, the bottom half of the screen went all red and the the low pitched tone abruptly became a high pitched tone. When ETP-1 was introduced, it was paired with thee same low pitched tone which would switch to the colour bars with red bottom half and high pitched tone for the final few minutes before the startup. When I visited the Westward TV area on summer hols in 1980 aged 6, they just had colour bars until the startup aired (although ETP-1 was up and running most elswhere.) So all in all, it looks to me like ETP-1 actually replaced the colour bars and Test Card F had already disappeared from ITV some years previously say about '75/'76. ETP-1 didn't directly replace F - it replaced colour bars which had already replaced F a few years earlier 81.158.209.230 (talk) 01:58, 29 October 2016 (UTC)[reply]

I know Granada used colourbars for it's closedown in the 1980's instead of ETP-1. The lower part of the screen was red and had the text GRANADA NCR with the high pitch 400hz tone. Granada did use ETP-1 for it's start up in the 1980's until the channel went 24 hours in 1988. — Preceding unsigned comment added by 80.79.209.48 (talk) 15:40, 11 January 2018 (UTC)[reply]