RE: Nicam modulation (or not) (OT)

["Phillip Harris" <phil@xxxxxxx>]

> 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?

Because the NICAM carrier and signal is not recorded with the video and
mono audio.#

> 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?

Nope ... It's sent modulated onto a carrier offset by a frequency which
I cannot remember from the base UHF frequency of the channel.

> 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.

NICAM VCRs do decode the NICAM audio and record it as a HiFi Stereo
(separate to the linear mono) track ... They pass that signal out as
stereo audio on phonos or SCART sockets - they do not remodulate as
NICAM as there are no decent cheap domestic NICAM encoders availsble.

> What's wrong?  My experience or my logic?

Your expectations?

Phil

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