Orban OPTIMOD-FM 5700i, Operating Manual

Page: 80 / 335

2-24
INSTALLATION ORBAN MODEL
B) Hold down the appropriate M
OD
. R
EDUCTION
button and turn the knob to set
the amount of modulation reduction produced by the M
OD
. R
EDUCTION
1 and
M
OD
. R
EDUCTION
2
functions.
You can program these to be activated via any rear-panel GPI input or by
the 5700i’s clock-based automation. (See
Remote Control Interface Pro-
gramming starting on page 2-43 and Automation starting on page 2-36.)
When both modulation reduction functions are active, the modulation
reduction is the sum of their settings.
To comply with FCC Rules, set the modulation reduction to one-half the
injection of the associated subcarrier. For example, if your subcarrier in-
jection totals 20% from two 10% subcarriers, set
M
ODULATION
R
EDUCTION
1
TO “5%” and M
ODULATION
R
EDUCTION
2 to 5%. This will reduce your audio
modulation to 90% (100% – 5% – 5%). When you add back the 20%
modulation due to the subcarriers, you get the required 110% total mod-
ulation.
The Modulation Reduction function is active as long as signal is applied
to its associated GPI input.
C) Program the GPI input(s).
a) Navigate to Setup > Next > N
ETWORK
&R
EMOTE
> R
EMOTE
I
NTERFACE
.
b) Using the
Next
button, scroll the screen until you see the button
corresponding to the GPI terminal you wish to program.
c) Hold down this button and turn the knob until you see
M
OD
. R
EDUCTION
1
or M
OD
. R
EDUCTION
2 as desired.
To program clock-based automation to activate modulation reduction, follow
the instructions found in “Using Clock-Based Automation” on page 2-36.
3. Program Silence Sense (optional)
You can program the 5700i to switch automatically from its digital input to its
analog inputs if the
I
NPUT
S
OURCE
is set to D
IGITAL
and the signal at the digital in-
put falls silent. Conversely, you can also program the 5700i to switch automati-
cally from its analog inputs to its digital input if the
I
NPUT
S
OURCE
is set to
A
NALOG
and the signal at the analog input falls silent
There are two silence detectors, one for the analog input and one for the
digital input. The silence sense parameters apply to both simultaneously.
Both detectors are available to drive the 5700i’s tally outputs but only
the “digital input” silence detector is used for automatic input switching.
(See step D) below.)
Silence sense will be activated if either channel falls silent, thus also pro-
tecting against “loss-of-one-stereo-channel” faults.
If silence is detected at the analog input as well as the digital input (as in
the case of a studio operational fault), automatic switching will not oc-
cur.
When an active signal is restored to the digital input, the 5700i will au-
tomatically switch back to that input.