Orban OPTIMOD-AM 9300, Руководство по эксплуатации

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1-22
INTRODUCTION ORBAN MODEL 9300
Orban offers the optional model MRF-023 Monitor Rolloff Filter for this purpose.
This filter is a small passive unit designed to be installed between the modulation
monitor and the monitor amplifier. (See step 8 on page 2-5 for installation instruc-
tions). It provides complementary deemphasis and a 10 kHz notch for off-air moni-
toring of NRSC standard audio. The output of the rolloff filter accurately simulates
the sound of a standard NRSC receiver. Alternately, for use in non-NRSC countries,
an adjustable 18dB/octave rolloff that complements the 9300's
HF G
AIN control can
be selected with jumpers (see Figure 2-4 on page 2-4). Figure 2-5 on page 2-5 shows
the frequency response of the Monitor Rolloff Filter for various settings of its
R
OLLOFF control.
If a different tonal balance is desired for off-the-air monitoring, install a simple pro-
gram equalizer after the Monitor Rolloff Filter and adjust the 5 kHz region to taste.
EAS Test
For stations participating in the Emergency Alert System (EAS) in the United States,
broadcast of EAS tones and data can be accomplished in three different ways:
1. Run EAS tones and data through the 9300.
Note that 9300 processing may not allow the full modulation level as required by
EAS standards. It may therefore be necessary to temporarily defeat the 9300’s
processing during the broadcast of EAS tones and data. Placing the 9300 in its
BYPASS
Test Mode can defeat the processing. The
BYPASS GAIN
control allows
a fixed gain trim through the 9300. See “Test Modes,” on page 3-37 for more in-
formation.
2. Place the 9300 in Bypass mode locally.
A) Navigate to
S
ETUP
> T
EST
> M
ODE
and set
M
ODE
to
B
YPASS
.
You can set the bypass gain with the
B
YPASS
G
AIN
control located to the
right of the
M
ODE
control.
B) Begin EAS broadcast.
After the EAS broadcast, resume normal processing:
C) Set the
M
ODE to
O
PERATE .
This will restore the processing preset in use prior to the Test Mode.
3. Place the 9300 in Bypass mode by remote control. Then program any
two Remote Interface inputs for “Bypass” and “Exit Test,” respectively.
A) Connect two outputs from your station remote control system to the
REMOTE INTERFACE
connector on the rear panel of the 9300, according to
the wiring diagram in Figure 2-2 on page 2-3.
B) Program two GPI ports for
B
YPASS and
E
XIT
T
EST according to the instructions
in Remote Control Interface Programming starting on page 2-40.