English: In 1934 the first testcard "Tuning Signals" was broadcast by BBC1, the earliest being a simple line and circle broadcast using Baird's 30 line system, and used to synchronise the mechanical scanning system.
{{Information |Description={{en|1=In 1934 the first testcard "Tuning Signals" was broadcast by BBC 1, the earliest being a simple line and circle broadcast using Baird's 30 line system, and used to synchronise the mechanical scanning system.}} |Source=Own
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