QMOD-HDSC HDTV Modulator

QMOD-HDSC

Overview | Specifications | Installation

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Test Setup

Before connecting to a full RF distribution system, set the system up offline.

Connect PC or Signage player to VGA In (or Component)
Set HDSC to RGBHV (or Component, Channel 2, RF Level 13, 1080i or 720p
Connect RF Out to an HDTV RF In, set the TV to scan for Cable. The set should find Channel 2 quickly, EXIT scanning
If the PC is off or the input doesn’t match, you should see a color screen on the TV.
As a general rule, use the QMOD resolution that is the closest to the input resolution. For example, a 1080i video will look better at 1080i than downscaling to 720p.

The reason you want to use a test setup first is to test and format scaling and formatting first. Once you know the setup is correct, there’s a lot less to resolve across the system. The major time-saver is setting horizontal, vertical, and clock phase visually on a local TV. Trying to do this when the TVs are a few hundred feet away is very difficult.

Test Resolution

Once the PC is running and the input is selected, the QMOD-HDSC will tell you the resolution on the bottom line of the front-panel display. You’ll get one of three messages:

RGBHV: 1024 x 768 60 – the PC resolution is in the HDSC list. You should see the PC on the TV. The display is an exact scan of the input video – on some VGA cards, this can be different than what the card states it is.
RGBHV: NO SIGNAL – the input may be incorrect, or the PC isn’t outputting on the VGA out, or a bad cable
RGBHV: Unknown SIG – the scaler sees the output, but it does not match the current list in the HDSC. Call CR Support and we’ll work on adding the resolution. Current resolutions are:
- 1920x1080i, 29.97/30 Hz, 25 Hz
  1440x900 at 60Hz
  1280x1024 at 60Hz
  1360x768 at 60Hz
  1280x768 at 60Hz
  1280 x 720p, 59.94.5, 60 Hz
  1152x864 at 75Hz
  1024x768 at 60, 75Hz
  800x600 at 60, 75Hz
  720 x 576p, 50
  720x480p, 59.94/30 Hz, 25 Hz
  640x480 at 60, 75Hz

Formatting

Horizontal Adjust

Hit SETUP and use the arrows to follow the menus in sequence:

The internal in-stream scaling engine handles a number of tasks for you – converting VGA to video 1080i/720p, shaping VGA resolutions to 16:9, and compensating for overscanning by TV sets. For all that, the process is very intuitive and easy to perform.

At the Horizontal menu, press the SELECT button to start the process – you will see a white bar in the middle of the QMOD display.

Up zooms the video horizontally, while Down scales the video down
Left moves the video left, Right moves the image right – line up the left side first, then zoom out
to line up the right edge
The solution is automatically saved for that resolution. Repeat for other resolutions, if needed.
If you get a crosshatched “green screen”, hold the Up arrow and click SETUP. That will restore settings. The usual cause for the screen is shrinking the video to extreme settings.

Vertical Adjust

At the Vertical menu, press the SELECT button to start the process – you will see a white bar in the middle of the QMOD display.

Up moves the video up, while Down moves the video down
Left zooms the video out vertically, Right scales the video down. The solution is automatically saved for that resolution. Repeat for other resolutions, if needed

Clock Phase

This menu tweaks how the scaler scans the video. Select values 0-7 and select the best scan result – differences show up more with static images rather than videos.

RF Level

You should use digital RF meter to measure the RF levels, so you can balance outputs when you combine, and at the TVs when needed.