Orban OPTIMOD-FM 8500S Operating Manual page 297

OPTIMOD-FM DIGITAL
FCC Federal Communications Commission (USA regulatory agency)
FDNR
frequency-dependent negative resistor⎯an element used in RC-active filters
FET field effect transistor
FFT fast Fourier transform
FIFO first-in, first-out
G/R gain reduction
HD Radio See IBOC
HF high-frequency
HP high-pass
IBOC "In-Band On-Channel" — a form of digital radio commercialized by iBiquity Corporation
where the digital carriers use a form of COFDM modulation and share the frequency alloca-
tion of the analog carriers. Also known by its trademarked name of "HD Radio."
IC integrated circuit
IM intermodulation (or "intermodulation distortion")
I/O input/output
ITU International Telecommunications Union (formerly CCIR). ITU-R is the arm of the ITU dedi-
cated to radio.
JFET junction field effect transistor
LC inductor/capacitor
LCD liquid crystal display
LED light-emitting diode
LF low-frequency
LP low-pass
LVL level
MHF midrange/high-frequency
MLF midrange/low-frequency
MOD modulation
N&D noise and distortion
N/C no connection
OSHOOT overshoot
PC IBM-compatible personal computer
PCM pulse code modulation
PPM peak program meter
RAM random-access memory
RC resistor/capacitor
RDS/RBDS Radio (Broadcasting) Data Service — a narrowband digital subcarrier centered at 57 kHz in
the FM baseband that usually provides program or network-related data to the consumer in
the form of text that is displayed on the radio. Occupied bandwidth is ±2500 Hz.
REF reference
RF radio frequency
RFI radio-frequency interference
RMS root-mean-square
ROM read-only memory
SC subcarrier
subsidiary communications authorization ⎯ a non program-related subcarrier in the FM
SCA
baseband above 23 kHz (monophonic) or 57 kHz (stereophonic)
SMT surface-mount
S/PDIF Sony/Philips digital interface (standardized as IEC958)
TRS tip-ring-sleeve (2-circuit phone jack)
THD total harmonic distortion
TX transmitter
μs Microseconds. For FM pre-emphasis, the +3 dB frequency is 1 / (2 π τ), where τ is the pre-
emphasis time constant, measured in seconds.
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TECHNICAL DATA