Glossary
B-3
CodeRunner 2
Operator’s Guide/Tech Ref Manual
IRE
1. Institute of Radio Engineers, an international
professional radio engineering association that
establishes various standards.
2. A unit of measurement, established by the IRE, in
which 1 IRE Unit =.00714 volts peak-to-peak (Vp-p)
and 140 IRE units equals 1 Vp-p.
ISI
Inter-Symbol Interference
Kbps
Kilobits per second.
KHz
Kilo (1,000) cycles per second.
LCD
Liquid Crystal Display
Lcl
Local
LED
Light emitting diode.
LO
Local Oscillator
LOS
Loss of Signal.
LPF
Low Pass Filter.
Mbps
Megabits per second.
MHz
Million (1,000,000) cycles per second.
MUX
Multiplexer.
NICAM
Near-Instantaneous Companding and Multiplexing
NRZ
Near Return to Zero.
ODU
Outdoor Unit - also called RF Unit or RFU
OFDM
Orthogonal Frequency Division Multiplexing
ØLK
Phase Lock.
PER
Parity Error Rate.
PLL
Phase Lock Loop.
Q
Quadature phase.
QAM
Quadrature Amplitude Modulation
Table B-1: Useful Terms (Continued)
QPSK
Quadrature Phase Shift Keying
The signal (video+audio) is imposed onto the 70 MHz
carrier by varying the phase of the signal while
keeping the amplitude and frequency constant. There
are 4 possible values of phase that can be used to
carry information.
RCL
Received Carrier Level.
Rcvr
Receiver.
RDS
Radio Data System
RF
Radio Frequency, any frequency of electromagnetic
radiation or alternating currents in the range from 3
kHz to 300 GHz; as in RF Signal or RF Transmission.
RF Level
RF Power from the transmitter.
RFU
Radio Frequency Unit - also called ODU
R-S
Reed-Solomon
Rx
Receiver.
S/W
Software.
SC
Service Channel.
SC
Single Carrier
SDI
Synchronous Digital Interface
A serial communications interface operating at
270 Mbit/sec., generally used for in-studio news
operations.
SER
Symbol Error Rate
Setpt Set
point.
SFN
Single-Frequency Network
Simplex
A channel capable of transmitting information in only
one direction.
Table B-1: Useful Terms (Continued)
