Contemporary Research
8
QMOD-HDSC
In most applications, the basic settings on the previous page will work fine with all displays. Of course, there
are exceptions to every rule that often arise with older displays with archaic firmware, which is why we offer
a variety of encoder options and settings. A few examples include:
Older LG sets need to see the MPEG stream encoded at 18 mbps (19.4 mbps total).
Newer displays don’t need channel data, older sets need to see the CVCT data table.
Some displays want to see certain PMT data, while most ignore almost all values.
Menu
Parameters
Quality Settings
These adjust the overall quality of encoding
Trig Lev
This is a cable compensation setting that adjusts output for different Component or RGBHV
cables. To see the difference in quality you’ll need a test chart from a Sencore or other HDTV
signal generator. Adjust using the same cable you’ll use for the installation.
The settings are 1-4, with 2 as the default.
Video Bitrate
This adjusts the quality of the encoded video, in mbits per second. For typical HD satellite/cable,
18 the best solution, as the receiver’s video output rarely exceeds 12 mbps, and old and new
display tuners will tune that in. For very good HD video sources, such as from HDTV studio feeds
on SDI or Component, 25 may produce visible improvement. Note that some older display tuners
don’t expect to see a video stream larger than 19.4, and you may need to go down to 18 for
those sets. The lower settings are for special applications and are rarely used in normal systems.
- 11, 13, 15, 18 (default ) , 25
MPEG Metadata
When you work with a variety of displays, old and new, you may need to change the settings
below to assure all tune the channels equally. The settings below select the type of metadata
included in the MPEG video stream.
PMT Type
Program Map Table Presets. This setting includes four presets that include various minor data
we’ve used in past installations. When a display can’t scan the channel, and you know the other
RF settings are valid, try changing the PMT type. This setting is also useful when most of the sets
tune in fine, except for few.
0-3 (0 is default)
CVCT
Default Cable Virtual Channel Table
On - Turns on virtual channel and short name in MPEG stream, if present
Changes QMOD display Channel to virtual channel
An “*” will appear at the end of the channel if it is virtual
Off - Turns off CVCT data, changes display back to Channel: <Physical>.1
Tip
: Turn off CVCT when creating virtual channel, then turn on when complete. TVs will need to
re-scan to find the channel.
EIT
Event Information Table
On, Off (Default)
Default=HDTV-Over Coax [G] (Shows in Guide in HDTV tuners)
Time/Date is fixed. May affect TV’s time and date.
Few displays need this data, generally keep off
Chan Major
Sets the Major portion of the virtual channel.
Press right or left arrow to start editing, use Up and Down arrows to select digit.
When Major is set to “000”, QMOD reverts to <Physical>.<Minor> mode
Chan Minor
Sets the Minor portion of the virtual channel.
Press right or left arrow to start editing, use Up and Down arrows to select digit.
Chan Name
Enters channel short name, up to 7 characters. “QMOD” is default text.
Press right or left arrow to start editing, use Up and Down arrows to select character.
