Nicam modulation (or not) (OT)

["Nick Broughton" <mail@xxxxxxx>]

This is something of a follow on from the KAT5 v's coax distribution
thread
that we had a week or two ago.  Keiths summary, as ever was brilliant,
but
it's ocurred to me this evening that it doesn't answer a question that
has
niggled for some time.

In my experience if you record a Nicam broadcast on a mono VCR (OK I know
we
are talking about stone age equipment, but it's the technical aspect
that
bothers me), and then replay it to a Nicam TV, why don't you get
stereo?

I believe that Nicam is modulated onto the 'normal' audio carrier. 
Nicam
modulation is expensive so VCR's don't do it, but if the Nicam was
never
demodulated, why isn't it the original modulated signal recorded and
passed
to the TV?

As I'm writing something else ocurrs to me.  Even a Nicam VCR could
record
audio before decoding it, but again in my experience they only playback
mono
if connected via RF, you need to connect via something 'better' to get
stereo.

What's wrong?  My experience or my logic?

Nick

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