
Skew correction controls
The ‘S’ and ‘Q’ ‘Skew’ correction controls can be adjusted by hand or using a small
screwdriver.
Skew Correction using XSQ™ technology
CAT 5e and CAT 6e cables contain 4 twisted pairs, which are used to transmit the
VGA signal from the Tx to the Rx units of CatX. Three of the four pairs are used to
transmit the Red, Green and Blue components of the VGA signal. There is a
difference in the number of twists per unit length of each pair in a UTP cable. This
causes a ‘shift’ between the different colours to the right or left, when displayed on the
Monitor attached to the Rx unit. This effect is most likely to occur when using Cat6
cable over longer distances (greater than 120m). For this reason Skew correction
controls are only included on 300m CatX Rx units
S.Y.Electronics Ltd has created XSQ™ technology as the skew correction system to
eliminate the ‘skew’ effect. XSQ™ technology uses two controls (S& Q) for a quick
and simple way to eliminate any skew effect on your output display.
Using the Skew control
In order to ensure that you have correctly adjusted the skew controls, it is highly
recommended that you download our bitmap test pattern (Fig 2.6) from the
www.pcswitch.co.uk website and use your CatX products to output this on a display
attached to an Rx unit. For the best results set the output display to 1024 x 768 at
72Hz.
Bitmap test pattern
Begin by turning the Sof the skew adjustment controls to the left and right and note
which colour on the test pattern (Red, Green or Blue) shifts to the left or right as you
do so. Repeat this for the Qcontrol.
Now you can use the S and Q control in turn to accurately align the three colours
(red, Green and Blue) so that the left and right edge form a perfect straight line.
Once this adjustment has been made, the test pattern should look the same as it does
in Fig 2.1 and it should only be necessary to alter these controls if the units are
reconnected using a different length of CAT5/6 cable.