Nokia 6800 Series - Manual (Page 102)

6800/7000 Series - Distribution and Routing Products Installation and Operation Manual 75
VPD-6830-XEQ Chapter 8: VPD-6830 Programmable Video DA Series
VPD-6830-XEQ
Configuration
1. Set the Input Coupling for either AC or DC coupling using jumpers
J2 and J3. See Figure 8-7 on page 76 for jumper locations.
2. Set the Clamping mode on jumper J1 to either Soft, Hard or No
Clamp . See Figure 8-7 on page 76 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 8-8 on page 76.
4. Adjust the equalization using the R6 multi-turn potentiometer in the
base module.
Turn the potentiometer clockwise to obtain more equalization. See
Figure 8-8 on page 76.
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 8-8 on page 76.
6. Select the cable length range compensation with jumpers J1 and J2,
located on the VPD-SBEQ submodule. See Figure 8-7 on page 76.
The R6 equalization potentiometer
on the VEA-6840 (Figure 8-7) is
used for continuous equalization
adjustments from 0 to 1000 ft
(300 m).