Orban OPTIMOD-FM 8700, Operating Manual

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OPTIMOD-FM DIGITAL TECHNICAL DATA
6-15
CIT composite isolation transformer
CMOS complementary metal-oxide semiconductor
COFDM Coded Orthogonal Frequency Division Multiplex
—a robust type of digital modulation using
many narrow-bandwidth, low data rate, mutually non-interfering carriers to achieve an ag-
gregate high data rate with excellent multipath rejection.
COM serial data communications port
D/A (or D to A) digital-to-analog converter
dBm decibel power measurement. 0 dBm = 1mW applied to a specified load. In audio, the load
is usually 600

. In this case only, 0 dBm = 0.775V rms.
dBu decibel voltage measurement. 0 dBu = 0.775V RMS. For this application, the dBm-into-
600

scale on voltmeters can be read as if it were calibrated in dBu.
DI digital input
DJ disk jockey, an announcer who plays records in a club or on the air
DO digital output
DOS Microsoft disk operating system for IBM-compatible PC
DSP digital signal processor (or processing). May also refer to a special type of microprocessor
optimized for efficiently executing arithmetic.
EBU European Broadcasting Union
EBS Emergency Broadcasting System (U.S.A.)
EMI electromagnetic interference
ESC escape
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 allo-
ca
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