Experimental Colour Transmissions
During the late 1950s and early-mid 1960s some experimental colour broadcasts were made in the UK using the 405-line system using NTSC colour encoding. The subcarrier frequency was 2.6578125 MHz (525/2 times line frequency) with an "I" signal bandwidth of 500 kHz and a "Q" signal bandwidth of 300 kHz. Tests with PAL, SECAM and other NTSC subcarrier frequencies were also attempted.
Some of these broadcasts were on UHF (also an experimental technology at the time), while others were carried over the regular VHF network outside of normal broadcasting hours.
Read more about this topic: 405-line Television System
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