Optimod-AM 9400 V1.2 Operating Manual - Orban
Optimod-AM 9400 V1.2 Operating Manual - Orban
Optimod-AM 9400 V1.2 Operating Manual - Orban
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2-36<br />
INSTALLATION ORBAN MODEL <strong>9400</strong><br />
of the L+R HF FR control until the ringing is again at the flattop modulation<br />
level will unbalance the ringing at the leading and trailing edge of<br />
the square wave, and necessitate further adjustment of the L+R HF <br />
control. Alternate between these two interactive controls until the peaks<br />
of ringing at both the leading and trailing edges of the square wave are<br />
at the flattop modulation level. Figure 2-11 illustrates a typical waveform<br />
before adjustment and Figure 2-12 shows the result of a successful adjustment.<br />
(The waveform produced by your system may look quite different.)<br />
H) Turn off the square wave generator and turn off the carrier to allow the<br />
transmitter to cool down for several minutes:<br />
a) Navigate to SETUP > TEST.<br />
b) Set the MODE to OPERATE.<br />
14. Set the L–R Transmitter Equalizer controls.<br />
[Skip this step unless you are setting a CQU<strong>AM</strong> <strong>AM</strong> stereo facility. The controls<br />
under adjustment in this step do not affect a mono facility if the <strong>9400</strong>’s analog<br />
processing chain is set to a mono mode.]<br />
After you have set up the CQU<strong>AM</strong> exciter for best separation without any audio<br />
processing by following its manufacturer’s instructions, you should trim the<br />
<strong>9400</strong>’s L–R HF FR and L–R HF controls to maximize stereo separation through<br />
the entire transmission chain, including the <strong>9400</strong>. In most cases, you will maximize<br />
separation if you set these controls to the same settings as their L+R counterparts.<br />
However, it may be worthwhile to sweep the system and trim the L–R<br />
controls to maximize separation. To do so:<br />
A) Navigate to SETUP > I/O CALIB.<br />
B) Set the <strong>AM</strong> PROC control to STEREO.<br />
C) Navigate to SETUP > TEST.<br />
D) Set the MODE to BYPASS.<br />
E) Connect the output of a sweep generator to one input channel of the <strong>9400</strong><br />
(either left or right). Ground the other channel to minimize crosstalk.<br />
Alternatively, you can use a sweep generator with a digital output and<br />
use the <strong>9400</strong>’s digital input.<br />
F) Set the sweep generator’s output level to produce about 50% modulation.<br />
G) Observe the output of your CQU<strong>AM</strong> stereo modulation monitor corresponding<br />
to the undriven channel.<br />
H) Navigate to SETUP > MODIFY TX PRESET > TX1/DAY.<br />
I) Press NEXT until you see the L–R HF FR and L–R HF DELAY controls.<br />
J) Set these controls the same as their L+R counterparts.