BBC Tuning Signals

Possibly the first ever television test chart, this very simple pattern was broadcast by the BBC in 1934 using Baird's 30 line TV system. [画像:Baird 30 Line Test Chart]

In 1934 and 35, BBC Television had this 'Television Eye" tuning signal, transmitted frequently prior to the few programmes shown.

An early BBC Tuning Signal, broadcast before each programme. The idea was to give the old television sets time to warm up, and for the viewer to adjust all of the controls to get a reasonable picture.

They were not "Test Cards" as such, as they were not designed to test anything, but they were a comforting sight for the early viewers operating somewhat unreliable equipment.

Note the "BBC" logo in computer MICR style, some years before computers were in use. This dates from before the war, around 1937-38. There was at least one other Tuning Signal in this period, sharing a similar design.

[画像:Another Early BBC Tuning Signal]

[画像:Early BBC Tuning Signal] This Tuning Signal heralded the return of the BBC Television Service at the end of the war, first broadcast on June 7th 1946.

BBC Tuning Signal from 1949.

This was the first to incorporate a clock. Nothing hi-tech, the hands were cardboard and had to be moved manually. It was first trasnmitted on 24th July 1949.

[画像:1949 BBC Tuning Signal with Clock]

Yet another style of Tuning Signal. The centre hole contains a 2.5MHz frequency grating. The "Test Transmission" version was usually seen when new transmitters were being set up in the 1950s.

Tuning Signal from around 1950, this was the first to be broadcast in 4:3 aspect ratio. The centre hole contains a 2.5MHz frequency grating. The "wavy lines" series was introduced in December 1949.

Same Tuning Signal, this time with a clock in the centre. Can anyone confirm exactly when these were shown, and how they were used? Was the one above shown first with the clock version clock reserved for the final minute, or was the clock only used at certain times of the day? Or were these two never shown at the same time?

The first attempt at incorporating the 'Bat's Wing' identifier in to a tuning signal. It made its first appearance on 19th August 1955. Was not terribly popular, and was replaced by...

[画像:BBC Angel Wings Tuning Signal] The BBC "Angel Wings" identifier / tuning signal. It was introduced in 16th June 1956 and accomapnied by a specially composed tune, the "Television March".

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