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Installation and Operation, cont'd
Front Panel
The features described in this section apply to both models
unless otherwise noted.
CENTERING
LEVEL
PEAK
BOOST
CONTROL
CENTERING
LEVEL
PEAK
BOOST
CONTROL
1
2
3
4
Level/boost control — This alters the video output voltage to
1
affect the brightness of the displayed
Unity:
0.70V p-p
image. Adjust the level/boost control
LEVEL
while viewing the displayed image to set
the level/boost that provides best picture
Maximum:
Minimum:
BOOST
1.45V p-p
0.50V 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.
Peaking (Peak) control — Peaking affects the sharpness of a
2
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
RGB 202 Rx x x x x i i i i i , RGB 202 Rx x x x x i i i i i VTG • Installation and Operation
2-6
RGB 202 R
WITH ADSP
INPUT
1
2
RGB 202 R
VTG
WITH ADSP
MINI VTG
INPUT
SXGA
VGA
1
202
XGA
SVGA
VTG
2
5
6
7
8
TM
TM
RGB 202 Rx x x x x i i i i i , RGB 202 Rx x x x x i i i i i VTG • Installation and Operation
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,
3
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
4
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
5
(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.
2-7
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