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View Full Version : ATSC vs. QAM Tuner?


PoppaPump
06-25-2008, 10:51 PM
I was hoping someone could shed a little bit of light on a question that just came up today. My friend had bought a HD Monitor with an NTSC/ATSC tuner. He hooked the coax cable into the back and ran the setup and only ended up receiving analog channels. (Or I'm guessing they were all analog) I was a little confused that I was able to receive local HD channels from my coax but he could not. After a little more investigation, it turns out that my tv also has a built in QAM tuner which "allows" these channels over coax? So here are my questions.

Is the QAM tuner just specific to HD channels with no cable box?

Theoretically, if you had an HDTV with no ATSC tuner and no QAM tuner, could you still receive HD programming from a cable box?

I guess I'm just trying to understand the importance of both of these. For now all it seems that the ATSC tuner does is give you local HD channels if you have an antenna. Please forgive my anal questions, I just really want to understand why this is the way it is.

Splicer
06-26-2008, 12:07 AM
QAM will receive CATV digital stations/audio...Of course you will only be able to watch 'in the clear' or what is not scrambled or 'encoded'...

ATSC is for reception of digital over the air...aka 'DTV'...

NTSC is for reception of analog...soon to be discontinued Feb 17 2009...over the air or CATV analog channels...

57U
06-26-2008, 12:19 AM
More on QAM tuners:

http://www.hdtvoice.com/voice/showthread.php?t=16662

If you have a cable box (and you want to get all your channels via cable), no tuner is necessary at all since the STB acts as the tuner.

PoppaPump
06-26-2008, 12:44 AM
Cool, thanks guys... I think I was making it more difficult than it needed to be ;)

Ratman
06-26-2008, 09:43 AM
NTSC is for reception of analog...soon to be discontinued Feb 17 2009...over the air or CATV analog channels...

The 2/18/09 analog cutoff is for over the air only. Cable is not part of the mandate.

Splicer
06-26-2008, 02:08 PM
True enough...I should have specified OTA only...

Ratman
06-26-2008, 03:10 PM
Being part owner of a cable facility and a cable tech, I would have thought you wouldn't make such a statement. ;)

Splicer
06-26-2008, 05:28 PM
Yeah well...;)

           


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