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Originally Posted by and®ew
"C4 is the "Reserve sound switching flag". It is used to notify the receiver that if NICAM is lost then it can switch to the FM mono sound signal which is transmitted for users without NICAM. "
http://www.doc.ic.ac.uk/~nd/surprise...nal/vol2/aps2/
well thats your opinion, however my opinions are backed up with facts.
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So theres a little known and irrelevant flag within the nicam data itself. If theres no nicam then theres no flag.
Theres no nicam as the first two answers at the start of the thread stated.