Orban OPTIMOD-FM 5500 Operation Manual page 223

OPTIMOD-FM DIGITAL
Digital Audio Output
Configuration: Stereo per AES3 standard. Output configured in software as flat or pre-
emphasized to the chosen processing pre-emphasis (50µs or 75µs), with or without J.17
pre-emphasis.
Sample Rate: Internal free running at 32, 44.1, 48, 88.2 or 96 kHz, selected in software.
Can also be synced to the AES3 digital input at 32, 44.1, 48, 88.2 or 96 kHz, as config-
ured in software.
Word Length: Software selected for 24, 20, 18, 16 or 14-bit resolution. First-order highpass
noise-shaped dither can be optionally added, dither level automatically adjusted appro-
priately for the word length.
Connector: XLR-type, male, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 trans-
former balanced and floating, 110 impedance.
Output Level (100% peak modulation): –20.0 to 0.0 dBFS software controlled.
Filtering: RFI filtered.
Wordclock/10 MHz Sync Reference Input
Configuration: Accepts 1x wordclock or 10 MHz reference signals, automatically selected.
The DSP master clock can be phase-locked to these signals, which in turn phase-locks
the 19 kHz pilot tone frequency, facilitating singe-frequency network operation. The digi-
tal output sample frequency can also be locked to these signals.
Level: Unit will lock to 1x wordclock and 10 MHz squarewaves and sinewaves having a
peak value of 0.5 V to 5.0 V.
Connector: BNC female, grounded to chassis, non-terminating to allow reference signals to
be looped through via an external BNC "tee" connector (not supplied).
Composite Baseband Output
Configuration: Two outputs, each with an independent software-controlled output level
control, output amplifier and connector.
Source Impedance: 0 voltage source or 75, jumper-selectable.
Load Impedance: 37 or greater. Termination not required or recommended.
Maximum Output Level: +16.0 dBu (13.82Vp-p).
Pilot Level: Adjustable from 6.0% to 12.0%, software controlled.
Pilot Stability: 19 kHz, ±1.0 Hz (10 degrees to 40 degrees C).
D/A Conversion: 24-bit
Signal-to-Noise Ratio: >= 85 dB (Bypass mode, de-emphasized, 20 Hz – 15 kHz band-
width, referenced to 100% modulation, unweighted).
Distortion: <= 0.02% THD (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, ref-
erenced to 100% modulation, unweighted).
Stereo Separation: > 55 dB, 30 Hz - 15 kHz. 65 dB typical at 400 Hz.
Crosstalk-Linear: <= –80 dB, main channel to sub-channel or sub-channel to main channel
(referenced to 100% modulation).
Crosstalk-Non-Linear: <= –80 dB, main channel to sub-channel or sub-channel to main
channel (referenced to 100% modulation).
38 kHz Suppression: >= 70 dB (referenced to 100% modulation).
76 kHz & Sideband Suppression: >= 80 dB (referenced to 100% modulation).
Pilot Protection: 60 dB relative to 9% pilot injection, ±250 Hz (up to 2 dB composite proc-
essing drive).
6-3
TECHNICAL DATA