[mythtv-users] Re: New MythTV Hardware Review

[Steve Malenfant]

I thought DVB-T was using OFDM, not QAM.


On Fri, 10 Dec 2004 10:29:35 -0500, Joseph A. Caputo
<jcaputo1 at comcast.net> wrote:
> On Friday 10 December 2004 08:41, sschaefer1 at woh.rr.com wrote:
> 
> 
> > Sorry, I have to ask a stupid question...
> >
> > > > Anyway, the pcHDTV card we are all talking about is rumoured to
> > > > have QAM support in development, so it could tune your cable and
> > > > you would not need an antenna.  As to when, who knows?
> > > >
> > > > The QAM signal for your local stations should be unencrypted.
> > > > The
> >
> > Wouldn't you still need to subscribe to the cable service to receive
> > a signal that you could tune into? If so, and you don't have a
> > subscription, you'd still need an antenna... or am I confused?
> 
> This is how I understand it (from one layman to another):
> 
> If you have digital cable, the digital channels (typically channels <
> 125 are still analog NTSC, even if you have a digital subscription) use
> QAM.  I'm not clear on whether it's the QAM signal itself or the MPEG-2
> content that's encrypted (if at all), but in any event the FCC
> stipulates that at least the local broadcast stations carried by your
> cable provider should be unencrypted (though your provider may not be
> in compliance).  I don't think there is currently any way for you to
> decrypt an encrypted QAM transmission outside of your cable company's
> STB.  Maybe if you have PhD's in cryptology and signal processing...
> 
> If you don't have digital cable, you may use an antenna to receive OTA
> digital broadcasts.  These do not use QAM, but 8VSB.
> 
> -JAC
> 
> 
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