OPTIMOD-FM INSTALLATION
2-13
• The green joystick, labeled Locate, is a pointing device that allows you to navigate to
settings and controls on each screen. Pressing and holding the knob left or right
moves you to the previous and next function screens (when multiple screens are
available).
• A yellow Escape button allows you to navigate quickly to underlying screens,
higher-level screens or the Meters screen, and displays the pop-up menu.
When a pop-up item, like Menu, is onscreen, Escape always returns you to
the underlying screen.
Pressing
Escape from a secondary screen page, like System Setup:
Place/Date/Time 1 takes you back to the top level; in this case, the System
Setup screen.
Escape from top-level screens (like the System Setup screen), brings you
back to the Meters screen. (If you are already in the Meters screen, Escape
displays the pop-up Menu.)
• The Control Knob is the large blue knob on the front panel. Turning the knob scrolls
through displayed lists (like the Preset screen list) or changes a setting that is high-
lighted onscreen (e.g., the setting last selected by the Locate joystick). Pushing the
knob in, towards the front panel, displays the pop-up Menu over the previous screen.
• Screen Display supplies control setting information and screen help, and displays the
gain reduction and level meters (described directly below).
The following meters and indicators are displayed on the 8400’s screen:
•
In meters show the peak input level applied to the 8400’s analog or digital inputs
with reference to 0 dB = digital full-scale.
•
AGC meters show the gain reduction of the slow AGC processing that precedes
the multiband compressor. Full-scale is 25 dB gain reduction.
Because the AGC is a two-band unit with Orban’s patented bass coupling
system, the two meters indicate the gain reduction of the AGC Master and
Bass bands.
• Gate indicators show gate activity. They light up when the input audio falls be-
low the threshold set by the gate threshold controls. (There are two gating cir-
cuits—one for the AGC and one for the multiband limiter—each with its own
Gate Thresh control.) When gating occurs, the AGC and compressor’s recovery
times are drastically slowed to prevent noise rush-up during low-level passages.
•
Multiband gain reduction meters show the gain reduction in the multiband com-
pressor. Full-scale is 25 dB gain reduction.
If the Multiband structure is operational, all the meters display gain reduc-
tion (G/R) activity. If the Two-Band structure is operational, only the two
leftmost meters display G/R activity.
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