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INTRODUCTION ORBAN MODEL 9300
increments between 4.5 kHz and 9.5 kHz. The lower cutoff frequencies meet the
output power spectral density requirements of ITU-R 328-5 without further low-
pass filtering at the transmitter, while the 9.5 kHz filter meets the requirements
of the NRSC-1 standard (North America). The 5.0 kHz filter makes the analog AM
bandwidth compatible with HD-AM transmission. The lowpass filters have para-
metric cutoff shapes, allowing you to trade off filter ringing against frequency
response flatness.
OPTIMOD-AM compensates for inaccuracies in the pulse response (tilt,
overshoot, ringing) of transmitters and antenna systems with a powerful
four-parameter transmitter equalizer. A built-in square-wave generator makes
adjustment easy. Four sets of equalizer parameters can be stored and recalled, al-
lowing you to program day and night variations for two transmitters.
Two mono analog outputs and one AES3 output accommodate as many as
three transmitters.
OPTIMOD-AM is usually installed at the transmitter, replacing all processing
normally employed at the transmitter site, including compressor, protection peak
limiters, clippers, and high- and low-pass filters normally included within the
transmitter. It can also be installed at the studio if an uncompressed digital
STL is available.
OPTIMOD-AM comes with a Monitor Rolloff Filter for use in studio monitor-
ing. This filter emulates the frequency response of an average receiver.
The 9300 includes analog and AES3 digital inputs and outputs. Both the digi-
tal input and the digital output are equipped with sample-rate converters and
can operate at 32 kHz, 44.1 kHz, 48, 88.2, and 96 kHz sample rates. The digital
output can be pre-emphasized to the J.17 standard.
The analog inputs are transformerless, balanced 10k instrumentation-
amplifier circuits, and the analog outputs are transformerless balanced, and
floating (with 351 impedance) to ensure highest transparency and accurate
pulse response.
All input, output, and power connections are rigorously RFI-suppressed to
Orban’s traditional exacting standards, ensuring trouble-free installation.
The 9300 is designed and certified to meet all applicable international safe-
ty and emissions standards.
Presets in OPTIMOD-AM
There are two distinct kinds of presets in OPTIMOD-AM: factory presets and user
presets.
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