Nokia 7000 Series, 6800 Series operation manual VPD-6830-DLY Series, Configurations

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

VPD-6830-DLY Series

Configurations

The fixed delay line can be one of the following amounts: 200, 400, 600, 800, or 1000 ns.

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,

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