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Skew delay compensation, Seq receiver skew compensation, Ease it (see – Extron Electronics MTP 1500RL 15HD RS SEQ User Guide User Manual

Page 16: Skew, Delay compensation, For details)

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Skew Delay Compensation

CAT 5, 5e and CAT 6 cable can lead to registration errors between the red, green, and
blue video signals. Pair skew can be measured with test equipment or identified by viewing
a crosshatch test pattern to determine if either the red, green, or blue video image leads
(appears to the left of) the other two video images.

NOTE: Unless the TP cable is changed, the skew adjustment should need to be made

only once, during installation

SEQ receiver skew compensation

The SEQ receivers have built-in skew compensation capabilities. Adjust the equalization as
follows:

1.

SEt the skew delay to zero for red, green, and blue as follows:

a.

Use a Tweeker or other small screwdriver to press and hold the Select button for
3 seconds. The Red, Green, and Blue LEDS all go out.

b.

Release the Select button.

2.

Use UTP cable test equipment or examine the displayed video image with a critical eye
to determine which video signal (red, green, or blue) is shifted furthest to the right.

NOTE: A crosshatch test pattern or a black background with vertical white lines is

ideal for determining skew.

3.

Adjust the furthest left video signal as follows:

NOTE: The SEQ receiver cannot shift the furthest right video image to the left.

a.

Use a Tweeker or other small screwdriver to press and release the Select button until
the LED for the left-shifted color (red, green, or blue) lights.

b.

Slowly rotate the Adjust control clockwise while monitoring the display. Continue to
rotate the control until that color is properly converged.

NOTE: A 2ns adjustment is very fine. Up to 10ns of delay may be necessary before

a change in the display is detectable. The maximum delay possible is 62ns.

c.

Use a Tweeker or other small screwdriver to press the Select button one more time
to save the most recent adjustment or allow the 10-second timeout to elapse.

4.

If the remaining color is left shifted, repeat step 3.

MTP 1500RL 15HD RS SEQ • Operation

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