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Installation and Operation, cont'd
Front panel controls and indicators
Figure 2-10 shows the front panel of the RGB 203 Rxi VTG. The
features described in this section apply to both models unless
otherwise noted in the description and by an asterisk (*) in the
callout number.
CENTERING
LEVEL
PEAK
BOOST
CONTROL
1
2
3
4
Figure 2-10 — RGB 203 Rxi VTG front panel
Level and peaking controls
Level/boost control — The Level/boost control alters the video
1
output voltage to affect the brightness of the displayed
image. Adjust the knob while viewing the displayed
Unity:
0.70V p-p
LEVEL
image to set the level/boost that provides the best
Boost
Range
picture quality.
Minimum:
Maximum:
BOOST
If the interface receives a typical (0.7 volts p-p) analog
0.50V p-p
1.45V p-p
computer video input, the output is as follows:
•
At the minimum level setting (the counterclockwise limit of
this control), the interface outputs 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 range (indicated by
the red line on the interface, the shaded area on the
illustration to the left) to output unity level video.
•
At the maximum level setting (the clockwise limit of this
control), the interface outputs video at 1.45 volts p-p.
Select a setting in the boost range (0.7 volts and above), 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
150 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
counterclockwise limit) provides no peaking. The maximum
setting (at the clockwise limit) provides 100% peaking. Adjust
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2-14
RGB 203 Rxi, RGB 203 Rxi VTG • Installation and Operation
VTG
WITH ADSP
MINI VTG
1
SXGA
VGA
203
2
3
XGA
SVGA
VTG
INPUT
9*
8*
5
6
CAMBOARD Electronics
TM
7
Tel. 07131 911201
RGB 203 Rxi, RGB 203 Rxi VTG • Installation and Operation
Fax 07131 911203
this control while viewing the displayed image to obtain the
optimum picture sharpness.
Centering controls
Many projectors store centering information in their own
memories based on signal frequency. When a projector displays
video from different input sources that have the same frequency,
one source's images may not be centered. Using the interface's
centering controls eliminates that problem.
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 item
.
4
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 DIP switch 1 (DDSP) is set to On
and either centering control is rotated, the LCD displays
N/A DDSP ON.
To use the display's centering controls rather than the
interface's controls, set the DDSP DIP switch to On.
Executive mode (see Executive mode in this chapter)
disables the interface's vertical and horizontal centering
controls. If executive mode is on and either centering
control is rotated, the LCD displays EXEC MODE ON.
The centering controls have no mechanical limits to
rotation. When the minimum or maximum limit of the
control is reached, LCD indicates the horizontal or
vertical shift limit has been reached and the picture stops
moving on the screen.
Centering memory
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.
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2-15
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