Re: QAM v. ATSC tuners

<jim.e.dimoni@xxxxxxxxxxxxxxxxxxx> wrote in message
news:530q235sap16cqjn7hratq142u623udrbe@xxxxxxxxxx
I'd like to get this clear also.

I have 2 "old" sets and one new. None HD.

None mention "QAM" but all have switches to allow receiving
unscrambled cable channels (2-76). I therefore assume QAM is
specifically HD - maybe not.

Looking at new HDTV some mention QAM, some only ATSC & NTSC.

My question - what determines if a set will receive the 2-76 cable
channels, or is it assumed that all new sets do via the std NTSC tuner
and a switch? -- AND the same assumption holds for the ATSC tuner in
receiving cable channels that somewhere there is a switch?

thx


On 16 Apr 2007 13:59:47 GMT, rlewart@xxxxxxxxxxxxxxxxxx (Cass Lewart)
wrote:

From my engineering days I remember that QAM stands for Quadrature
Amplitude Modulation, a method to squeeze more bits per second into a
limited bandwidth transmission line. ATSC is a standard used for HD over
the air transmission. Some people refer to QAM tuners and ATSC tuners as
2
different items, some use the terms for the same tuner. Which is
correct?
If these are 2 different items what are the inputs and outputs?
Cass

http://www.hdtvprimer.com/


.

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