- ETP-1
ETP-1 (or Electronic Test Pattern One) was a
test card designed and used by theIndependent Broadcasting Authority (IBA). After test transmissions from the IBA's Engineering Regional Operations Centre (ROC) in Croydon from 1978 it was phased in onITV over a period starting from1979 , replacingTest Card F . After ITV went 24 hours in1988 , the card ceased to be seen on the channel.It was also seen extensively on both
Channel 4 andS4C during both the pre-launch tests and during the downtime of those channels, due to their limited hours early on. After launch, it was alternated with in-visionteletext services from ORACLE and4-Tel . On these channels, it was captioned as IBA:CH4 and IBA:S4C, with lines above and below this indicating the card was being generated by the channel, the absence of these lines meant it was generated at the transmitter. After the splitting up of the IBA in1990 , the captioning was changed toNTL :CH4. It was last broadcast onDecember 31 ,1992 after which Channel 4 showed4-Tel on View until it went 24 hours in1997 whereas S4C broadcast black screen and tone.
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