In message , charles
writes
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.

You're not telling me that, in practice, on a domestic colour TV set,
you can really see any difference in quality between a System I picture
and a System B/G picture (are you)? Even you could, was the difference
in standards really worth the bother? [Of course, technical excellence
was not the true reason that we - and a few other countries - took the
System I route.]

Eastern Europe had an even greater
vision bandwidth with, ISTR, 9MHz channel spacing

No. Their SECAM D/K uses/used 8MHz channels (both VHF and UHF).
--
Ian