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Installation and Setup, cont'd
Front Panel Adjustments
Video signals passing through long cable runs of over 125 feet
(38.1 meters) can decrease in strength, creating signal loss. The
longer the cable, the greater the cable resistance and capacitance,
and the greater the level and peaking adjustments that will
be required to compensate for the resultant signal loss. These
adjustments change the level and peaking of the output signal
to compensate for capacitance caused by up to 1000 feet (304.8
meters) of Extron SHR cable.
1.
RGB 580xi • Installation and Setup
2-10
If the displayed image is too bright or too dark, try
changing the level setting. If the edges of the displayed
image seem to exceed their boundaries, or if thin lines
and sharp edges look thick and fuzzy, try changing the
peaking setting. See the illustration below.
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Level
Level adjustment control — The Video Output Level
control alters the brightness of the displayed image. To
adjust the video output level, view the display while using
a small, flat-blade screwdriver to rotate this one-turn
potentiometer. You can judge the adjustment visually by
looking at the display.
If the interface receives a typical (0.7 volts p-p) analog
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 approximately one-half turn between
the minimum and maximum level settings 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 level setting of 0.7 volts or above to compensate
for the decrease in signal level that occurs when the signal
passes through long cables. Set the level at the maximum
setting for cable lengths over 500 feet for all computer
signals of 15 kHz to 135 kHz.
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Peaking
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