Interference Analysis
The S332D can provide assistance in identifying signal types from cellular
sites. If you are plagued by an unknown signal, you simply enter the
frequency of the signal of interest as the “IA Frequency” and press
“Measure.” The instrument looks at the bandwidth and skirt shape and,
if the signal is of a known type, it gives the name of the air interface
standard (e.g., 1250 kHz CDMA) and the measured bandwidth of the signal.
If the signal isn’t a cellular signal, it simply gives the bandwidth.
Back
Measure
I
A Free=1932.48 MHz Cell Standard = 1250 kHz CDMA
Center 1.932GHz Span 3.874MHz
SA––IA1
Ref Lvl – 70.0 dBm RBW 3 kHz VBW 1 kHz
Set
IA
Freq
IA
Freq To
Center
IA
Freq As
Marker M1
Swp Time
Recall
R
MS Avg
8 dB/Div
Atten
Dynamic
R
ecall
Back
Main Ch Pwr: –67.15 dBm Main Ch BW: 1.230 000 MHz
Lower ACPR: –27.30 dB Adj Ch BW: 1.230 000 MHz
Upper ACPR: –22.92 dB Ch Spacing: 1.230 000 MHz
Center 1.932GHz Span 3.874MHz
SA––1
Ref Lvl 70.0 dB RBW 3 kHz VBW 1 kHz
Center
Freq
Main
Channel
BW
Adj
Channel
BW
Channel
Spacing
ACPR
RMS Avg
8 dB/Div
Atten
Dynamic
Recall
Measure
Spectrum Analysis – Anywhere,
Anytime (S332D)
The Site Master S332D integrated Spectrum Analysis capability provides the “ultimate” in measurement flexibility for
field environments and applications requiring mobility. With the S332D you can locate, identify, record and solve
communication systems problems quickly and easily, and with incredible accuracy – making it a perfect solution for
conducting field measurements in the 100 kHz to 3 GHz frequency range.
One Button Measurements
The S332D has dedicated routines for one-button measurements of field strength, channel power, occupied bandwidth,
Adjacent Channel Power Ratio (ACPR), Carrier-to-Interference, and interference analysis. These are increasingly critical
measurements for today’s wireless communication systems. The simple interface for these complex measurements
significantly reduces test time and increases analyzer usability.
Adjacent Channel Power Ratio
A common transmitter measurement is that of adjacent channel leakage
power. This is the ratio of the amount of leakage power in an adjacent
channel to the total transmitted power in the main channel. This
measurement is used to replace the traditional two-tone intermodulation
distortion (IMD) test for system non-linear behavior
.
The result of an ACPR measurement can be expressed either as a
power
ratio or a power density
. In order to calculate the upper and
lower
adjacent channel values, the S332D allows the adjustment of four
parameters to meet specific measurement needs: main channel center
frequency
, measurement channel bandwidth, adjacent channel bandwidth
and channel spacing. When an air inter
face standard is specified in the
S332D, all these values are automatically set to the normal values for
that standard.
AM/FM/SSB Demodulator
A built-in demodulator for AM, narrowband FM, wideband FM
and single sideband (selectable USB and LSB) allows a technician to
easily
identify inter
fering signals.
(12 paginas)
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