NARDA IDA, Руководство по эксплуатации, Страница: 280 / 292

19 Glossary
272
IDA - 3106 Narda
Term or
Abbreviation
Meaning Function / Explanation
AM
A
mplitude
m
odulation Modulation method (used for radio
broadcasting, for example).
Atten Attenuator
Attenuator
Attenuators are used to adjust signal levels. A
high measurement dynamic range can be
achieved in a signal analyzer by correctly
choosing the input attenuation. The finely
spaced setting for the IDA - 3106 is coupled with
the reference level RL setting.
BFO
B
eat
F
requency
O
scillator
Beat Frequency Oscillator
The beat frequency oscillator is used to correct
the frequency offset of a demodulated signal.
This is particularly useful for carrierless single
sideband modulated signals (LSB, USB) where
there is no exact frequency reference.
BW
B
and
w
idth The bandwidth is the width of the frequency
spectrum used to transmit data.
CBW
C
hannel
b
and
w
idth
Channel bandwidth
Steep edged channel filters that give a high
degree of channel separation are used to select
individual channels.
CW
C
ontinuous
w
ave
Continuous wave
Constant signal characterized by constant
amplitude and frequency. Can be selected as
the demodulation type for clocked carrier
signals (Morse signals).
Detector Detector A detector captures the measured values, e.g.
as peak values (
+Peak, -Peak
) or average
values (
RMS
). Detectors are mostly used to
compress the data, i.e. the number of data
points is reduced.
DGPS Differential GPS Method of increasing the accuracy of GPS
navigation by transmitting correction data (path
and time system).
DVB-T
D
igital
V
ideo
B
roadcasting
T
errestrial
Terrestrial digital transmission of television
signals.
Fcent Center frequency Center frequency in a frequency range. Also
called the tuning frequency of a receiver or for
receiving the signals from individual channels.
FM
F
requency
m
odulation Modulation method.
Fmax/Fstop Upper limit frequency Highest frequency in a frequency range.
Fmin/Fstart Lower limit frequency Lowest frequency in a frequency range.
Fspan Frequency span (range) Frequency band centered about the center
frequency
Fcent
.