Orban OPTIMOD-FM 8600, Operating Manual

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2-14
INSTALLATION ORBAN MODEL 8600
E
SCAPE
from top-level screens (like the System Setup screen), brings you
back to the Meters screen. (If you are already in the Meters screen,
E
SCAPE
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 highlighted 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 dis-
plays the gain reduction and level meters (described directly below).
The 8600’s screen displays the following meters and indicators:
•
I
N METERS
show the peak input level applied to the 8600’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 pre-
cedes 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.
•
G
ATE INDICATORS
show gate activity. They light up when the input audio
falls below the threshold set by the gate threshold controls. (There are two
gating circuits—one for the AGC and one for the multiband limiter—each
with its own Gate Thresh control.) When gating occurs, the AGC and com-
pressor’s recovery times are slowed drastically to prevent noise rush-up dur-
ing low-level passages.
•
M
ULTIBAND GAIN REDUCTION METERS
show the gain reduction in the multi-
band compressor. Full-scale is 25 dB gain reduction. The
MB GR M
ETER
switch (in
I
NPUT
/O
UTPUT
> U
TILITIES
) determines what signals the 2-Band and
5-Band Compressor gain reduction meters indicate. The switch can be set
to
FM
,
HD
, or
S
PLIT
. In
S
PLIT
mode, the 8600’s front panel display shows the
gain reduction of the FM analog multiband compressors on the left side of
the split meters and the gain reduction of the digital radio compressors on
the right. If the left and right channel gain reductions are not identical in a
given band, its meter displays the larger of the left or right channel gain
reductions.
•
2B HF
meters display the gain reductions in dB of the independent left and
right channel high frequency limiters in the 8600’s Two-Band structure.
These meters appear only when the 8600 is in Two-Band mode.
•
O
UT METERS
display 8600’s instantaneous peak output level.
•
C
OMP METER
displays the stereo encoder’s output level before the
C
OMP
1
or
C
OMP
2
attenuators, in percent scale over a 125 to 0 range.