Nokia 6800 Series - Manual (Page 73)

Chapter 5: VDA-6830 Video Distribution Amplifier Module Installation
46 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual
Installation
The VDA-6830 module can be installed in a Leitch FR-680x or FR-7001
series frame, or an FR-7000MB MIX BOX frame. If this module is
installed in an FR-7001 series or FR-7000 MB MIX BOX frame, a
6800-M back module is required.
There is no need to terminate unused outputs; however, doing so will
improve response.
A jumper near the board connector provides a selection of input
impedance between 75
W and high impedance. This jumper should be
removed if high-input impedance is required.
Operational Adjustments
A multi-turn Gain potentiometer provides adjustment over a range of
-3 to +3 dB. A single-turn potentiometer allows fine adjustment of the
high-frequency Response (10-30 MHz).The gain is increased when the
potentiometer is adjusted clockwise.
Both the Gain and Response controls are located on the front edge of the
module.
The potentiometer is factory set,
and re-adjustment is not
recommended without precise
test equipment.