Nokia 6800 Series Equalization Adjustment, Manual Equalization, Automatic Equalization

Equalization Adjustment Chapter 1: AES-6880 AES/EBU Digital Audio Distribution Amplifier Module

Equalization Adjustment

The AES-6880 distribution amplifier provides two options for equalization adjustment: Manual and Automatic. The mode is selected using jumper J1 near the front edge of the DA card. See Figure 1-3 on page 4 for jumper location.

Manual Equalization

In Manual adjust mode, a card-edge, multi-turn potentiometer (R19) is used for adjusting equalization. The Confidence flag warning on the card-edge LED is used to determine the amount of equalization required without external test equipment. If the Confidence flag error LED is on, then more equalization is needed.

To increase the amount of equalization, simply use a screwdriver to turn the Manual equalization adjustment potentiometer (R19) clockwise until the Confidence LED indicator turns off. See Figure 1-3 on page 4 for potentiometer location.

Automatic Equalization

The factory default configurations for J1 is in the “Auto” position, and the Manual equalization adjustment potentiometer (R19) is set for zero compensation.

In Automatic adjust mode, the distribution amplifier automatically sets the amount of cable equalization needed. This mode eliminates the need to re-adjust equalization if another distribution amplifier is installed or exchanged, or if the cable length changes.

The equalization is designed for using 2000 ft (600 m) of Belden 8281 cable or the equivalent. In practice, if the incoming signal is a standard AES signal for coaxial cable systems, this DA can compensate up to 6000 ft (1800 m) of Belden 8281 cable or equivalent.

6800/7000 Series - Distribution and Routing Products Installation and Operation Manual 3