Nokia 7000 Series, 6800 Series operation manual VPD-6830-DLY240, Configuration

Chapter 8: VPD-6830 Programmable Video DA Series VPD-6830-DLY240

VPD-6830-DLY240

Configuration

The VPD-6830-DLY240 provides adjustable delay from 0 to 240 ns. The additional delay submodule is shown on the VEA-6840 base card in Figure 8-15 on page 91.

To configure the VPD-6830-DLY240:

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. See Figure 8-16 on page 92.

4.Adjust the equalization using the R6 multi-turn potentiometer in the base module.

Turn the potentiometer clockwise to obtain more equalization. See Figure 8-16 on page 92.

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 8-16 on page 92.

6.Position the delay submodule P2 jumpers horizontally across the jumper sockets, connecting pins 2 & 4, and pins 1 & 3.

Connecting the jumpers horizontally puts them in Bypass mode. Connecting them vertically puts them in Use mode. See Figure 8-15 on page 91 for an illustration of this jumper set.

7.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,

88 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual