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Emerge EMS Installer/User Guide
Chapter 3: Operations
25
Skew Compensation Adjustments (Emerge EMS1000MP-R Receivers Only)
The twisted pair cabling used to link the Emerge EMS units
consists of four pairs of wires per cable. Three of these pairs
are used to convey the red, green and blue video signals.
Due to slight differences in twist rate between the wire
pairs, the red, green and blue video signals may not arrive
at precisely the same time. This effect is visible as separate
color shadows on high contrast images and is particularly
apparent when using higher screen resolutions over long
distances and also when using certain types of category 5e
cables.
Skew compensation adjustments are made using two rotary
dials, the rst affects the relationship between the green and
blue color signals (SKEW GB) while the second (SKEW RG)
operates similarly on the red and green signals. Each dial
delays one of its stated colors in relation to the other. By using both dials it is possible to correctly
align all three colors. The effects of skew are easiest to view and adjust when distinct red, green
and blue elements, in close proximity, are present within the screen image. An appropriate test
pattern is supplied on the Emerge EMS CD-ROM (To Display the Supplied Skew Test Pattern) or
alternatively you can create your own test pattern as discussed below.
NOTE: Both video outputs are equally affected by your skew adjustments.
To Create a Skew Test Pattern
1. Run any image creation/editing application, such as the
Paint program supplied with Windows.
2. Using the image application create three stacked
horizontal rectangles (one red, one green and one blue)
that ll the width of the screen.
3. Draw a vertical black line down across the colored bars
and then repeat this vertical line at intervals along the
width of the colored bars. These lines create breaks across
the colors and give you more opportunities to view the
horizontal position of each color relative to the others.
Figure 3.4: Location of the skew
compensation adjustment dials
Figure 3.5: Creating a suitable skew
test pattern within a paint package