Old NTSC tricks: 240p?

tony duell ard at p850ug1.demon.co.uk
Wed Mar 18 13:18:33 CDT 2015

> At one time there were at least four B&W video transmission standards in Europe (we had a tube TV with a 
> 4-position selection knob to support them).  625/50 regular, 625/50 inverted in some way (?) used by the Dutch 
> speaking Belgian stations, 819/50 for France, and a different 819/50 for French speaking Belgian stations.

Not part of the _video_ signal, but part of the overall signal : IIRC continental Europe (mostly?) put the sound
carrier 5.5 MHz way from the video carrier, but the UK had a 6MHz offset. 


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