Vertical interval signals on 405

[Murphyv310]

In Europe these signals are known just as Insertion Test Signal (ITS) because VITS is a swear word in one European language - French, I believe

Trevor, your suggestion that the pulse was at 2.5MHz, if correct, would suggest the British Relay weren't quite as critical in their test methods as the broadcasters.

BRW used the offair VIT. I was under the impression that the 405 line pulses were 2.5mHz, I stand corrected if I'm wrong.