Nokia 6800 Series Manuel d'utilisateur télécharger pdf (Page 117)

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

90 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual

VPD-6830-DLY Series

Configurations

The VPD-6830-DLY435, VPD-6830-DLY635, VPD-883-DLY1035, and

the VPD-6830-DLY1235 series provides adjustable delay from 0 to

1235 ns delay. The additional delay submodule is shown on the

VEA-6840 base card in Figure 8-15 on page 91.

To configure a VPD-6830-DLY series module:

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

J1 and J2. See Figure 8-15 on page 91 for jumper locations.

2. Set the Clamping mode on jumper J3 to either Soft, Hard, or No

Clamp. See Figure 8-15 on page 91 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. Adjust the

equalization using the R6 multi-turn potentiometer in the base

module.

Turn the potentiometer clockwise to obtain more equalization.

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.

4. Position the delay submodule P2 jumpers horizontally across the

jumper sockets (connecting pins 2 and 4, and pins 1 and 3) for

Bypass mode.

Position the jumpers vertically for Use mode when the fixed delay

line is installed. See Figure 8-15 on page 91 for an illustration of this

jumper set.

5. Position the delay submodule P3 jumpers either horizontally

(Bypass mode) or vertically (Use mode) across the jumper sockets.

Jumper P3 is a six-section, two-position jumper set. This jumper

“selects” the desired amount of selectable delay. For each section,

there are two jumper positions: horizontal and vertical. The

horizontal position is Bypass mode, where a designated amount of

delay can be bypassed. The vertical position is the Use position,

The fixed delay line can be one

of the following amounts:

200, 400, 600, 800, or 1000 ns.

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Nokia 6800 Series Manuel d'utilisateur Page 117