Nokia 6800 Series - Manual (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).