2-30
INSTALLATION ORBAN
MODEL
9400
10.
Set output and configuration level.
This is a preliminary level adjustment. Later in this installation procedure, you
will set 9400 for the highest modulation level that your facility can produce. If
your transmission facility proved to have overshoot, tilt, or ringing when you
tested it in step 11 on page 2-31, you will have to go through the Transmitter
Equalizer adjustment procedure, which starts with step 12 on page 2-31.
A)
Make sure that the transmitter is turned off.
B)
Turn on the 400Hz calibration tone. To do this:
a)
Navigate to
S
ETUP
>
T
EST
.
b)
Set the
M
ODE
to
S
INE
.
c)
Set
S
INE
F
REQ
to
400
H
Z
.
d)
Set
T
ONE
M
OD
to 50%.
e)
Press the
N
EXT
key.
f)
Set
T
ONE
C
HAN
to
L+R
.
C)
Set modulation.
a)
Set to its minimum level the
AO
X
100%
or
DO
X
100%
control associated
with the output you are using to drive the transmitter under adjustment.
For example, the AO1 control is found in
I/O
C
ALIB
>
A
NALOG
1
>
AO1
and
the
DO1
control is found in
I/O
C
ALIB
>
D
IGITAL
1
>
DO1
100%
.
b)
Turn the transmitter on.
c)
Set the control you adjusted in step (a) to produce 40% modulation.
This leaves 2 dB of headroom to accommodate overshoot in the transmis-
sion plant. This should suffice for most plants.
The most accurate way to set this control is by observing a modulation
analyzer or oscilloscope connected to your transmitter.
D)
In
S
ETUP
>
T
EST
, set the
M
ODE
to
O
PERATE
.
E)
Drive the 9400 with program material and observe the negative modulation
level. Trim the
AO
X
100%
or
DO
X
100%
control associated with the output you
are using to drive the transmitter under adjustment so that you observe 99%
modulation on negative peaks.
Spend time observing the modulation with different program material. If
you see the peak modulation level vary significantly depending on pro-
gram material, the 9400’s transmitter equalizer can usually improve this
situation considerably.
Note that if you set the processing up for asymmetrical modulation
(which is done by editing the active Transmission Preset) and you observe
negative peaks that are higher than positive peaks, you can correct this
by changing the setting of the
P
OLARITY
control, located next to the
AO
X
100%
or
DO
X
100%
control.
Summary of Contents for Optimod-AM 9400
Page 1: ...Operating Manual OPTIMOD AM 9400 Digital Audio Processor Version 1 2 Software...
Page 7: ...Operating Manual OPTIMOD AM 9400 Digital Audio Processor Version 1 2 Software...
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Page 261: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 29...
Page 267: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 35 CPU Module...
Page 273: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 41 RS232 BOARD PARTS LOCATOR...
Page 275: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 43 8300 POWER SUPPLY PARTS LOCATOR...
Page 284: ...6 52 TECHNICAL DATA ORBAN MODEL 9400 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 292: ...6 60 TECHNICAL DATA ORBAN MODEL 9400 DISPLAY BOARD PARTS LOCATOR...
Page 293: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...