On Fri, 6 Aug 2010 22:38:57 +0100, tony sayer
wrote:

Its cut off at 15 kHz in most all systems to protect the pilot tone at
19 kHz..


The low cutoff in FM is not so much to do with the pilot tone as the
fact that it is distributed to the transmitters using NICAM, which has
a 32kHz sampling rate.

d

Don do bear in mind that the BBC isn't the only broadcaster in the UK and not
all use NICAM feeds;!.


Let's have no words of sacrilege spoken here, please.

Also FM stations elsewhere in the world aren't NICAM fed.. Usually line or
microwave radio link.


The GPO used to supply lines to the BBC. They had not so much a
rolloff as a continual slope. I think the Beeb engineering department
designed equalizers, but of course there isn't an engineering
department any more.

Still a couple of K up at that end aren't going to set the world alight;}..

Not for me they aren't - not any more anyway.

d