Nokia 6800 Series Manuel d'utilisateur télécharger pdf (Page 108)

6800/7000 Series - Distribution and Routing Products Installation and Operation Manual 81

VPD-6830-DEQ Chapter 8: VPD-6830 Programmable Video DA Series

VPD-6830-DEQ

Configuration

1. Set the Input Coupling for either AC or DC coupling using jumpers

J2 and J3. See Figure 8-11 on page 82 for jumper locations.

2. Set the Clamping mode on jumper J1 to either Soft, Hard or No

Clamp. See Figure 8-11 on page 82 for jumper location.

3. Adjust the gain over a range of -3 dB to +3 dB using the R5

multi-turn potentiometer in the base module.

Turn the potentiometer clockwise to increase the gain. See

Figure 8-12 on page 82.

4. Adjust continuous equalization to the Belden 8281 using the R6

multi-turn potentiometer in the base module.

Turn the potentiometer clockwise to obtain more equalization. See

Figure 8-12 on page 82.

5. Make fine adjustments to the high-frequency response using the R21

single-turn potentiometer in the base module.

The high-frequency response is factory-set/calibrated.

Readjustment is not recommended without precise test equipment.

See Figure 8-12 on page 82.

6. Turn-off R6 on the main board (counterclockwise to minimum).

Adjust R5 on the SBDEQ to obtain the required equalization for

Nokia 0.6/2.8 cable.

Before adjusting R6, the

potentiometer R5 on the SBDEQ

must be set to zero (turn R5

counterclockwise to its minimum

adjustment value).

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Nokia 6800 Series Manuel d'utilisateur Page 108