Extron electronic MTP SW6 user manual Installation and Operation, cont’d Optimizing the Video

Installation and Operation, cont’d

Optimizing the Video

Most MTP transmitters and the MTP SW6 output have a pre- peaking feature.

Set these features as follows for the best image quality:

1. For inputs from MTP T 15HD products only — If the cable between the MTP transmitter and the MTP SW6 is > 300', turn the transmitter’s Pre-Peak switch on. For shorter cables, turn the switch off.

2. For the output — If the cable between the MTP SW6 and the receiver is > 300', turn the switcher’s Pre-Peak switch on. For shorter cables, turn the switch off.

NUnless the TP cable lengths are changed, these settings should need to be made only once, during installation.

Level/peaking setting

1. Connect an oscilloscope (preferred) or a monitor (acceptable) to the switcher's output via a very short (<25' [7.5 m]) TP cable and a compatible MTP receiver).

2. If using an oscilloscope, apply a white field test pattern to the input to be optimized via an MTP transmitter.

If using a monitor, apply a grayscale or Color Bars test pattern to the input to be optimized via an MTP transmitter.

HThe Extron VTG 300 or VTG 400 are recommended to provide the test pattern.

3. Select the input to be optimized.

4. Observe the oscilloscope or the monitor with a critical eye while you adjust the front panel input level and peaking controls to compensate for signal loss between the transmitter and the MTP SW6.

5. If necessary, repeat steps 1 through 4 for each input.

6. If level/peaking and skew adjustments are available on the connected receiver(s), set them in accordance with the applicable MTP receiver product manual.

7. Disconnect the oscilloscope or monitor connected in step 1.

Skew delay compensation

CAT 5/5e/6 TP 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 with a critical eye to determine if either the red, green, or blue video image leads (appears to the left of) the other two video images.

NSkew correction should not be necessary when Extron Enhanced Skew-Free A/V UTP cable is used and the transmission distance is less than 1,000' (300 m).

NUnless the TP cable is changed, the skew adjustment should only need to be made once, during installation.

NFor best results, repeat the skew compensation for each input.

The switcher has built-in skew compensation capabilities for its TP output. Adjust the equalization as follows:

1. Select an input

2. Zero the skew delay for red, green, and blue as follows:

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

b. Release the Delay Select button.

3. 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 most shifted to the left.

HThe Extron VTG 300 or VTG 400 are recommended to provide a crosshatch test pattern, which is ideal for determining skew. A black background with vertical white lines can also be useful.

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