Extron electronic RGB 202 Rxi VTG user manual Installation and Operation, cont’d Front Panel

Installation and Operation, cont’d

Front Panel

The features described in this section apply to both models unless otherwise noted.

			CENTERING			RGB 202 R WITH ADSP TM
LEVEL	PEAK
							INPUT
							1
BOOST	CONTROL						2
			CENTERING	MINI VTG		RGB 202 R	VTG WITH ADSP TM
LEVEL	PEAK
							INPUT
			SXGA
				VGA	202		1
BOOST	CONTROL		XGA	SVGA	VTG		2
1	2	3	4	5	6	7	8

1Level/boost control — This alters the video output voltage to

		Unity:	affect the brightness of the displayed
	LEVEL	0.70V p-p	image. Adjust the level/boost control
			while viewing the displayed image to set
Minimum:	BOOST	Maximum:	the level/boost that provides best picture
0.50V p-p		1.45V p-p	quality.

If the interface receives a typical (0.7 volts p-p) analog computer video input, the output will be as follows:

•At the minimum level setting (the counterclockwise limit of this control), the interface will output video at 0.5 volts p-p.

•Unity level is 0.7 volts p-p, the same as the input signal. Set the control to just before the boost area (indicated by the red line) to output unity level video.

•At the maximum level setting (the clockwise limit of this control), the interface will output video at 1.45 volts p-p.

Select a setting in the boost range (0.7 volts and above), indicated by the red line, to compensate for the decrease in signal level that occurs when the signal passes through long cables.

Set the boost at 100% (the maximum level) for cable lengths over 500 feet for all computer signals of 15 kHz to 135 kHz.

2Peaking (Peak) control — Peaking affects the sharpness of a picture. Increased peaking can compensate for detail (mid- and high-frequency) loss from low bandwidth system components or capacitance in long cables. The minimum setting (at the

3

4

5

counterclockwise limit) provides no peaking. The maximum setting (at the clockwise limit) provides 100% peaking. Adjust this control while viewing the displayed image to obtain the optimum picture sharpness.

Vertical centering () — While viewing the displayed image, rotate this control to move the image up or down on the screen. During centering adjustment, the LCD displays V-SHIFT, and it indicates the vertical shift minimum or maximum limit when the centering limit has been reached. See the notes below.

Horizontal centering () — While viewing the displayed image, rotate this control to move the image to the right or left on the screen. During centering adjustment, the LCD displays H-SHIFT, and it indicates the horizontal shift minimum or maximum limit when the centering limit has been reached.

DDSP disables the interface’s vertical and horizontal centering controls. If DDSP is set to On and either centering control is rotated, N/A DDSP ON appears on the LCD display.

To use the display device’s centering controls instead of the interface’s centering, set the DDSP DIP switch to On.

The centering controls have no mechanical limits to rotation. When the minimum or maximum limit of the control is reached, the picture stops moving on screen.

Many projectors store centering information in their own memories based on signal frequency. When a projector displays video from input sources that have the same frequency, one source’s images may not be centered. Using the interface’s centering controls eliminates that problem.

Turning the centering control knobs not only moves the images, but it also stores the horizontal and vertical centering settings in separate memories for each selected input. The interface recalls the centering settings each time an input is selected. Centering adjustments only need to be set once for an application because the settings are saved even when the power is off.

VTG output resolution and pattern selection switch (RGB 202 Rxi VTG only) — Select a combination of display resolution and video test pattern using this 16-position rotary switch. Four different video test patterns are available for each of the four resolutions offered by the RGB 202 Rxi VTG’s built-in mini video test generator. See “Operating the VTG” in this chapter for more information.

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