Editing List of BBC test cards (section)

==Unidentified test card==
[[File:BBC Electronic Card.jpg|thumb|Recreation of the BBC unnamed electronic test card]]
An electronically generated image was first broadcast on 21 June 1997 on BBC2 between 3{{nbsp}}am and 4{{nbsp}}am. It was also broadcast in October 1997 from 3:29{{nbsp}}am until 3:44{{nbsp}}am, when, at the same time, BBC1 showed Test Card G. Both channels reverted over to these at the same time, and reverted to TCF at the same time, as part of a switching test with BBC Birmingham, whereby in the event of a need to evacuate BBC TV to [[Pebble Mill Studios]] in [[Birmingham]], such as a power failure [[Television Centre, London#Power failures|as happened in June 2000]], a switch would be thrown, putting Birmingham in control of the network, until [[Television Centre, London|BBC Television Centre]] could regain control. Both TCG and this image were transmitted from Birmingham to prove the switching facility worked.

This test card was then seen again on 17 April 2007 between 4{{nbsp}}am and 5{{nbsp}}am during the [[BBC Learning Zone]]. Both transmissions were accompanied by a four-tone test tone, ranging from extremely low frequency to a very high shrill. It is unknown if this Test Card has a name,<ref name="meldrum"/> though this test card has also been known to be used on point-to-point satellite links originating from the [[Fucino Space Centre]]<ref name=":0">{{Cite web|url=http://ing-sat.what.hu/testcard-feeds.htm|title=Testcards-feeds|website=ing-sat.what.hu}}</ref> and other places in Italy (Telefisco,<ref name=":0" /> Lapet,<ref name=":0" /> etc), and by [[Altice Portugal|Marconi Portugal]].<ref name=":0" /> Another version, modified for [[NTSC]], was used by [[Televisión Nacional de Chile]] (TVN)<ref>{{Cite web |title=Question: this is a layout of a SMPTE-like test pattern used by Chilean channel TVN (which uses NTSC) that I don't remember having seen anywere else. Could have been a custom design for the channel? |url=https://www.reddit.com/r/VIDEOENGINEERING/comments/mqi8yt/question_this_is_a_layout_of_a_smptelike_test/ |access-date=2023-01-13 |website=reddit |date=14 April 2021 |language=en}}</ref> in the 1990s.