What is QAM? and also...

[CKNA]

EXAMPLE of my LG LSS-3200A

The 3200A receiver has ATSC (high definition), NTSC (standard definition) and DIRECTV® tuners so it is able to process both over the air (OTA) and satellite signals as well as unscrambled cable (QAM). It integrates all stations into a single programming guide that is flexible and generally quite fast. This is either the only receiver you need or a great supplement to any integrated tuners your TV may have.

The back panel is fairly simple yet surprisingly complete. It has inputs for the DIRECTV® antenna feed, a cable connection, and an OTA antenna connection. It has single video outputs in the following formats – DVI (with HDCP), RGB, component, s-video, composite (two of these) and RF. The RF output can also be used to loop through the OTA or cable signal (but not both) when the unit is in standby mode. There is a 2-position switch for selecting either component or RGB/DVI. The s-video and composite outputs are always active, which is one of the major improvements.

There are two sets of stereo audio outputs and one optical digital audio output. There is no coaxial digital audio. There is an RS-232 data port and the standard phone jack for ordering pay per view programming. There is also an IR blaster output to make it easy to interface the 3200A with a VCR and an input for using the remote control in RF mode.

The front panel is even simpler. Besides the typical power and cursor buttons, there are buttons for the Display Format, Info, Menu, Guide, Select and Exit functions. All of these are duplicated on the remote with the exception of the Display Format function. The display is very easy to read in all lighting conditions from several feet away but is not obtrusive in a dark room. The access card slot is also in the front.

LG LSS-3200A, Hughes HTL-HD and Sony HD300 are the same reciever inside. They all were made by LG and they do not recieve QAM. That info is wrong. The chip inside can receive QAM but it is disabled. D* does not allow reception of QAM and will never enable it. As a matter of fact all OTA reciver chips support reception of for few years now. I know it makes no sense to some but D* will eventually carry LIL HD channels and do not want people to use cable for that.

I have HTL-HD myself and I know it does not recieve QAM. If you guys still do not beleive me try it for yourself.

 

[CKNA]

What is QAM (hope that is right)
Also I have heard my RCA 210 HD tuner can receive my local cable companies QAM siganl and decode it so I can watch it even though i only have cable for interent? sound right? Not trying to get something for free but i don't want to miss out on a free thing either. I had heard they have to broadcast the QAM thing due to law??? any help me thanks.

I doubt that it is true. The chip inside supports QAM but D* makes them disable QAM part. Maybe RCA wanted to include it but once D* finds out I bet they had to disable it.
Get one and try it.

 

[Neutron]

Would this be true for all Directv receivers?

 

[CKNA]

Would this be true for all Directv receivers?

RCA DTC100 first generation HD receiver had a chip that did not have QAM. Newer recievers have chip that supports QAM but it is disabled.

 

[Neutron]

It didn't do me any good. All it picked up were the analog channels up to 100. After I disconnected it I had a real mess in my guide. I had to go from ALL to CUSTOM after hiding all the cable channels. Even a reset doesn't fix this.

 

[charper1]

but it did work? i don't think any unscrambled digital will be over 100, but it makes since that D* would disable the feature because that is the same area the want to remap locals and HD like CKNA said. glad i never took the time to test mine, sorry about your guide Neutron

 

[Neutron]

Oh, it worked alright. I was able to view the minor locals that only the cable company carries (advertising channels really) plus I was able to view E! and MTV2, the only other two channels I tested.

It will show the channels already taken by remapped locals just fine.

The cable channels looked like crap though, but that was expected on a 16:9 HDTV.

It's would have been the exact same as if I hooked up the cable to my TV's CATV in jack.

 

[CKNA]

but it did work? i don't think any unscrambled digital will be over 100, but it makes since that D* would disable the feature because that is the same area the want to remap locals and HD like CKNA said. glad i never took the time to test mine, sorry about your guide Neutron

What he picked up was analog channels. All digital channels are above 100 on pretty much every cable system. Once they will shut off analog then they will have digital channels below 100. Besides, when you scan QAM the channels show up as ie 102-1, 102-2 or 102-3. They usually have 10 SD or 2,3 HD channels on single frequency. The numbers will not correspond to what cable box shows as they can assign any number to any channel.

 

[charper1]

i was referring to the D* box numbering.

 

[stevesmall]

I think it stands for Quadrature Amplitude Modulation and thus:

a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. QAM is used with pulse amplitude modulation (PAM) in digital systems, especially in wireless applications.

In a QAM signal, there are two carriers, each having the same frequency but differing in phase by 90 degrees (one quarter of a cycle, from which the term quadrature arises). One signal is called the I signal, and the other is called the Q signal.

Mathematically, one of the signals can be represented by a sine wave, and the other by a cosine wave. The two modulated carriers are combined at the source for transmission.

At the destination, the carriers are separated, the data is extracted from each, and then the data is combined into the original modulating information.

THANKS,
i thinkhttp://www.satelliteguys.us/newreply.php?do=newreply&p=251942#
Confused

 

[jdspencer]

I didn't find any reference in my HTL-H manual about QAM capability. Just that it can receive DirecTV, NTSC analog OTA, and ATSC digital OTA. Interestingly, I have my SD TiVo's RF output (ch3) connected to the cable input. I find that the resultant upconversion works quite well with my RPTV.