ADDER AdderLink X100 User's Guide download pdf (Page 13)

welcome contents

installation

& operation

special

configuration

furter

information

Skew adjustment

The category 5, 5e and 6 cabling supported by the X100 receiver consists of four

pairs of wires per cable. Three of these pairs are used to convey red, green and

blue video signals to the remote video monitor. Due to the slight difference in

twist rate between these three pairs, the

red, green and blue video signals may not

arrive at precisely the same time. This is

visible as separate colour shadows on high

contrast screen images and is particularly

apparent when using higher screen

resolutions and some types of category 5e

and 6 cables.

To alleviate this situation, the Adder

X100AS receiver provides internal skew

adjustment that can help to rectify the

situation. The skew adjustment works by

delaying or advancing the timing of any

of the red, green or blue colour signals so

that they are all delivered to the monitor

at precisely the same time. For best results, the “skew” program supplied on

the disk or downloadable from www.adder.com or www.adder.info is the

most accurate way of setting skew as the red, green and blue lines are rendered

exactly on the screen as single pixel wide lines. The skew.bmp test pattern can

also be used but it is less accurate. Alternatively, you can create your own skew

pattern using a standard image creation package, as detailed opposite.

Convergence test

pattern showing the

RGB crosses. In this

case, the green signal

can be seen out of

line with the other

two colours.

1 2 3 4 5 6 7 8

Data signal

Red

video signal

Green

video signal

Blue

video signal

To use skew adjustment

1 Display a skew pattern on the appropriate computer. You can either use the

supplied skew pattern or create your own:

Using the supplied skew pattern

i Insert the supplied Adder Installation CD-ROM into the CD player of the

computer.

ii Within Windows, use the My Computer

option (usually available as a desktop icon

or within the Start menu) to view the

contents of the CD-ROM. Double-click

the Skew entry to display the standard

test pattern. If necessary, maximise the

application window so that the image ﬁlls

the screen.

The screen will show a series of ﬁne red,

green and blue crosses which should all be

in line, vertically and horizontally. Skew affects the horizontal placement of

the colours and using this pattern it is much easier to discover which, if any,

colours are being adversely affected by the cable link.

Creating a skew test pattern

i Run any image creation/editing application, such as the Paint program

supplied with Windows.

ii Using the image application create three

stacked horizontal rectangles (one red,

one green and one blue) that ﬁll the

width of the screen.

iii Draw a vertical black line down across

the coloured bars and then repeat this

vertical line at intervals along the width

of the coloured bars. These lines create

breaks across the colours and give you

more opportunities to view the horizontal

position of each colour relative to the others.

2 On the remote user keyboard (connected to an Adder X100AS receiver),

simultaneously, press the hotkeys (by default, and ) along with to

enter conﬁguration mode.

The three keyboard indicators (‘Num Lock’,

‘Caps Lock’ and ‘Scroll Lock’) will now begin

to ﬂash in sequence.

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ADDER AdderLink X100 User's Guide Page 13

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