Operating instructions

6-2
TECHNICAL DATA ORBAN MODEL 9400
Low-Pass Filter (processing for analog modulation): 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0,
8.5, 9.0, or 9.5 (NRSC) kHz as set by user. Unit can be set up to comply easily with ITU-
R and NRSC spectrum masks. Filter can be set to be –0.1 dB, –3.0, or –6.0 dB down at
the edge of the passband, trading off ringing against brightness.
Low-Pass Filter (processing for digital modulation): 15 kHz.
High-Pass Filter (processing for analog modulation): Constrained by user settable fifth-
order “quasi-elliptical” highpass filter to 50, 60, 70, 80, 90, or 100 Hz. All filters have
equal-ripple (Chebychev-like) passbands, and 25 and 35 Hz notches for transmitter pro-
tection.
High-Pass Filter (processing for digital modulation): 1 Hz, not user-adjustable.
Processing Topology: The stereo enhancer and two-band AGC are common to the analog
and digital processing chains. The processing path splits after the AGC. The analog path
receives equalization, five-band compression, distortion-controlled and -canceled clip-
ping, overshoot compensation, and transmitter equalization. The digital path receives
equalization, five-band compression, and look-ahead limiting. The parameters of the
equalizers, five-band compressors, and peak limiters in the two paths are separately and
independently adjustable.
Processing Delay (processing for analog modulation): approximately 17 ms.
Processing Delay (processing for digital modulation): approximately 24 ms. Any output
can be switched to emit a monitor signal with 5 ms. delay. This signal contains the out-
put of the five-band digital-channel compressor/limiter.
Delay Difference between Analog AM and Digital Processing Chains: Fixed at 5.778
ms, regardless of processor control settings.
Installation
Analog Audio Input
Configuration: Stereo.
Impedance: >10k load impedance, electronically balanced
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.
Nominal Input Level: Software adjustable from –9.0 to +13.0 dBu (VU).
Maximum Input Level: +27 dBu.
Connectors: Two XLR-type, female, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and
3 electronically balanced, floating and symmetrical.
A/D Conversion: 24 bit 128x oversampled delta sigma converter with linear-phase anti-
aliasing filter. Converter outputs 64 kHz sample rate, which the 9400 then decimates to
32 kHz in DSP using an ultra-high-quality image-free synchronous sample rate con-
verter.
Filtering: RFI filtered, with high-pass filter at 0.15 Hz (–3 dB).
Analog Audio Output
Configuration: Two stereo pairs, capable to driving two transmitters.
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No jumper selection available for 600. Through-hole pads are available on I/O module for user-
installed 600 termination.