In article , Ian Jackson
wrote:


Of course, both the British and the Irish could have simply adopted the
European systems B and G (5.5MHz sound-vision - plus the horrendous
group delay pre-correction curve). If I remember correctly, the only
difference between systems B and G is the 7 vs 8 MHz channel spacing.
Even the VSBs are the same (0.75MHz).

The extra channel width allowed the sound to be 0.5MHz higher and thus
allowed a greater vision bandwidth. Eastern Europe had an even greater
vision bandwidth with, ISTR, 9MHz channel spacing

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