OPTIMOD-AM DIGITAL
INSTALLATION
2-33
There are four analog outputs and you will be using two at most while
adjusting any given Transmission Preset. You may have to move the sync
connection between outputs if you need to set up Transmission Presets
for two transmitters.
C)
Turn on the 9400's built-in square wave generator:
a)
Navigate to
S
ETUP
>
T
EST
.
b)
Set the
T
ONE
M
OD
to 0%.
c)
Set the
M
ODE
to
S
QUARE
.
d)
Set
S
QR
F
REQ
to
125
H
Z
.
D)
Turn on the carrier.
E)
Observe the RF envelope at the common point with a DC-coupled oscilloscope
and advance the
T
ONE
L
VL
control to produce 30% modulation.
F)
Navigate to
S
ETUP
>
M
ODIFY
TX
P
RESET
>
TX1/D
AY
.
G)
If necessary, press
N
EXT
until you see the screen containing the four L+R
transmitter equalizer controls.
H)
Review the RF envelope display.
Many transmitters (particularly older designs) will produce an RF enve-
lope resembling
Figure 2-9
. If the oscilloscope display looks like this, con-
tinue to step (I).
If the oscilloscope display looks like
Figure 2-10
, no low frequency equali-
zation is necessary. Skip to step 13 on page 2-34.
I)
Set the L
+R
LF
GN
to 10.0 dB.
Setting the L+R LF GN control to maximum low-frequency boost ensures
response that is closest to true DC-coupling, optimizing square wave re-
sponse.
Depending on the transmitter, this large amount of boost at sub-audible
Figure 2-9: Unequalized RF envelope
(showing tilt)
Figure 2-10: RF envelope requiring
no tilt equalization
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 260: ......
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...
