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6-14
TECHNICAL DATA
FDNR
frequency-dependent negative resistoran 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
―In-Band On-Channel‖ — a form of digital radio commercialized by iBiquity Corporation
IBOC
where the digital carriers use a form of COFDM modulation and share the frequency allo-
cation of the analog carriers. Also known by its trademarked name of ―HD Radio.‖
IC
integrated circuit
intermodulation (or ―intermodulation distortion‖)
IM
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
Radio (Broadcasting) Data Service — a narrowband digital subcarrier centered at 57 kHz
RDS/RBDS
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
s
Microseconds. For FM pre-emphasis, the +3 dB frequency is 1 / (2 ), where is the pre-
emphasis time constant, measured in seconds.
VCA
voltage-controlled amplifier
ORBAN MODEL 5500i
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