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List of BBC test cards
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==Tuning Signals== [[File:First TV TestCard.svg|thumb|upright=0.7|First tuning signal]] [[File:AxusteBBC.jpg|thumb|upright=0.7|Later tuning signal from 1937]] The first "[[Interval signal|Tuning Signals]]" test card was broadcast by the BBC in 1934. It was a simple line and circle broadcast using [[John Logie Baird|Baird's]] [[Mechanical television|30-line system]], and was used to synchronise the mechanical scanning system.<ref>{{cite web|title=BBC Tuning Signals |url=http://www.meldrum.co.uk/mhp/testcard/bbc_tune.html |date=29 March 2000 |publisher=Meldrum |accessdate=14 August 2009 |url-status=dead |archiveurl=https://web.archive.org/web/20090223154155/http://www.meldrum.co.uk/mhp/testcard/bbc_tune.html |archivedate=23 February 2009 }}</ref>
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