2-14
INSTALLATION ORBAN Model 8400
• Out meters display 8400’s output in two distinct modes. The meters can be set to
display in L/R or L+R/L–R mode.
•
Comp meter displays the stereo encoder’s output level before the Comp 1 or
Comp 2 attenuators, in percent scale over a 125 to 0 range.
•
HD meters display the gain reduction of the left and right look-ahead limiters that
feed the HD outputs.
These meters appear only when the HD option is installed.
• Multiplex Power meter indicates the action of the ITU Multiplex Power control-
ler. It shows how much the MPX Power Controller has reduced the clipper drive,
reducing the average power in the processed audio.
This meter, labeled “P,” is displayed on the 8400’s color LCD. It always ap-
pears when the Two-Band Structure is active. When the Five-Band Structure
is active, the meter only appears when the MPX Power Controller is turned
on.
Installation of Studio Level Controller (optional)
If using an Orban 8100AST (or 8100A/ST) Studio Chassis, refer to page 1-16.
[Skip this section if you are not using a studio level controller ahead of the 8400. Con-
tinue with “Quick Setup” on page 2-23.]
If you are using Orban 8200ST-Studio Chassis
If the STL uses pre-emphasis, its input pre-emphasis network will probably in-
troduce overshoots that will increase peak modulation without any increase in
average modulation. We therefore strongly recommend that the STL transmit-
ter’s pre-emphasis be defeated (freeing the STL from such potential over-
shoot), and that the 8200ST be used to provide the necessary pre-emphasis.
If the STL transmitter’s pre-emphasis cannot be defeated, configure the
8200ST for flat output. In this case average modulation levels of the STL may
have to be reduced to accommodate the overshoots.
1. Configure the 8200ST’s internal jumpers.
A) Remove all screws holding the 8200ST’s cover in place, then lift it off.
B) Refer to Fig. 2-4.
a) Place jumper JA in the “CLIPPER ON” position.
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