Quote:
Originally Posted by kan_turk
Yes - the change from system D (6.5MHz sound spacing) to system B (5.5MHz sound spacing) was a separate operation from colour system change and was achieved seamlessly by first introducing a new sound carrier at +5.5MHz (having first limited vision bandwidth to about 5.2MHz - so there were two sound carriers for a time - the +6.5MHz carrier then being switched off - this facilitated the introduction of Nicam stereo etc
Hope this clarifies
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I'm really surprised that that worked. Having the additional sound carrier would play havoc with sound on vision, intermod problems etc.
It certainly was not necessary to introduce Nicam which can be used on both systems BG and DK using a Nicam carrier at 5.824 MHz.