Orban OPTIMOD-FM 8500S Operating Manual page 85

OPTIMOD-FM DIGITAL
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
B) Set the FM P
transmitter.
9. Configure Composite Outputs
A) Navigate to Setup > S
to 50µs or 75µs, depending on your country's standard.
B) Set PILOT LVL to 9%.
If you have to reduce the setting of the composite level (C
2 LV) control to accommodate overshoots in the transmission path
C
OMP
following the 8500S (including the transmitter), you may have to increase
the setting of the
C) If your country enforces the ITU-412 multiplex power standard, set ITU412 to
O . See step 1 on page 2-22.
N
D) If you are using the 8500S's pilot reference output to drive a subcarrier gen-
erator, set the 19
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
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
T control. The control sets the delay applied to the composite, analog, and
RIM
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
need to use the Next button to see them. Reset these parameters if necessary.
H) Using the C
ite output to produce 100% modulation of the FM carrier on modulation
peaks.
/ > U
NPUT OUTPUT
control to P
OLARITY
E
TEREO NCODER
P L
ILOT EVEL
control to the phase relationship between the 19 kHz
R
K EF
D
VRSTY LY
is set to S
ODE TEREO
1 L and C 2 L
OMP V OMP
screen.
TILITES
or N as appropriate for your
OSITIVE EGATIVE
> Next > P -E
RE MPH
so that the pilot is still at 9% modulation.
to I . Otherwise, set it to O
N
and X T is set to O
TALK EST
controls, adjust the level for each compos-
VL
INSTALLATION
. Set the pre-emphasis
1 LV or
OMP
.
UT
D
VRSTY LY
. (You may
PERATE
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