Nokia 7000 Series Benutzerhandbuch
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.
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.
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.
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.
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).
potentiometer R5 on the SBDEQ
must be set to zero (turn R5
counterclockwise to its minimum
adjustment value).