Orban Optimod-FM 8300 Operating Manual page 60

2-12
INSTALLATION
These flash when such a menu is in use. Otherwise, they are inactive.

Control Knob is used to change the setting that is selected by the soft buttons.
To change a value, you ordinarily have to hold down a soft button while you are
turning the control knob.

Recall button allows you recall a Factory or User Preset.
Selecting the Recall button does not immediately recall a preset. See step
18 on page 2-21 for instructions on recalling a preset.

Modify button brings you to list of controls that you can use to edit a Factory or
User Preset. If you edit a Factory Preset, you must save it as a new User Preset to
retain your edit.

Setup button accesses the technical parameters necessary to match the 8300 to
your transmission system.

Escape button provides an escape from current screen and returns user to the
next higher-level screen. Repeatedly pressing Escape will always return you to
the Idle screen which is at the top level of the screen hierarchy.

Input meters show the peak input level applied to the 8300's analog or digital
inputs with reference to 0 = digital full-scale. If the input meter's red segment
lights up, you are overdriving the 8300's analog to digital converter, which is a
very common cause of audible distortion.

AGC meter shows the gain reduction of the slow two-band AGC processing that
precedes the multi-band compressor. Full-scale is 25 dB gain reduction. You can
switch the meter so that it either reads the gain reduction of the Master (above-
200 Hz) band, or the difference between the gain reduction in the Master and
Bass bands.
The latter reading is useful for assessing the dynamic bass equalization
that the AGC produces, and it helps you set the AGC BASS COUPLING
control.

Gate LED indicates gate activity, lighting when the input audio falls below the
threshold set by the AGC gate threshold control (via the Full Modify screen's
AGC G control). When this happens, the AGC's recovery time is slowed to
ATE
prevent noise rush-up during low-level passages.
There is also an independent gate for the multiband compressor (2-band
and 5-band). You can only see its action from the Optimod PC Remote
software.

Gain Reduction meters show the gain reduction in the multi-band compressor.
Full-scale is 25 dB gain reduction.
When the Multi-Band structure is operating, all the meters indicate gain
reduction. When the Two-Band structure is operating, the two leftmost
meters indicate gain reduction in the Master and Bass bands, while the
ORBAN MODEL 8300