OPTIMOD-FM DIGITAL
INSTALLATION
2-29
move the advantages of the distortion cancellation in the 8500S’s final
clipper. (The composite limiter does not cancel distortion.)
8.
Set the polarity of the analog FM processing (optional).
In HD Radio installations, this command is useful when switching the 8500S be-
tween transmitters if the transmitters’ exciters produce opposite FM modulation
polarities when driven by identical digital audio input signals. This setting affects
any output emitting the analog FM processed signal, including the composite
output.
A)
Navigate to the
I
NPUT
/
OUTPUT
>
U
TILITES
screen.
B)
Set the
FM
P
OLARITY
control to
P
OSITIVE
or
N
EGATIVE
as appropriate for your
transmitter.
9.
Configure Composite Outputs
A)
Navigate to
Setup
>
S
TEREO
E
NCODER
>
Next
>
P
RE
-E
MPH
. Set the pre-emphasis
to 50
µ
s or 75
µ
s, depending on your country’s standard.
B)
Set
PILOT
LVL
to
9%
.
If you have to reduce the setting of the composite level (
C
OMP
1
LV
or
C
OMP
2
LV)
control to accommodate overshoots in the transmission path
following the 8500S (including the transmitter), you may have to increase
the setting of the
P
ILOT
L
EVEL
so that the pilot is still at 9% modulation.
C)
If your country enforces the ITU-412 multiplex power standard, set
ITU412
to
O
N
.
See step 1 on page 2-22.
D)
If you are using the 8500S’s pilot reference output to drive a subcarrier gen-
erator, set the
19
K
R
EF
control to the phase relationship between the 19 kHz
reference and the 8500S’s pilot tone required by your subcarrier generator. In
most cases, this will be 0 degrees.
E)
Press the
Next
button. If you need to apply the 8500S’s diversity delay to the
composite outputs, set
D
VRSTY
D
LY
to
I
N
. Otherwise, set it to
O
UT
.
It is not possible to apply the delay to only one of the two composite
outputs.
F)
If you are using the diversity delay, set its value using the
Setup
>
D
VRSTY
D
LY
T
RIM
control. The control sets the delay applied to the composite, analog, and
digital outputs when these outputs have been configured to receive delay.
While it is possible to activate or defeat the diversity delay independently
for the analog output, digital output, and composite outputs, it is not
possible to apply different amounts of delay to different outputs.
G)
Be sure that
M
ODE
is set to
S
TEREO
and
X
TALK
T
EST
is set to
O
PERATE
.
(You may
need to use the
Next
button to see them. Reset these parameters if necessary.
H)
Using the
C
OMP
1
L
V
and
C
OMP
2
L
VL
controls, adjust the level for each compos-
ite output to produce 100% modulation of the FM carrier on modulation
peaks.
Summary of Contents for OPTIMOD-FM 8500S
Page 1: ...Operating Manual OPTIMOD FM 8500S Digital Audio Processor Version 1 0 Software...
Page 7: ...Operating Manual OPTIMOD FM 8500S Digital Audio Processor Version 1 0 Software...
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Page 310: ...6 28 TECHNICAL DATA ORBAN MODEL 8500S CONTROL BOARD PARTS LOCATOR...
