Specifications

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Spectrum Master™ Compact Handheld Spectrum Analyzer Features
Fixed WiMAX Signal Analyzers (Options 0046, 0047)
RF Measurements – Occupied Bandwidth
The bandwidth that contains 99% of the total carrier
power. Excessive occupied bandwidth means excessive
adjacent channel interference.
RF Measurement – Preamble Power
High or low values will create larger areas of cell-to-
cell interferences and create lower data rates near cell
edges. Low values affect in-building coverage.
Demodulation – Spectral Flatness
Check for uneven amplitude of sub-carriers. Data will
be less reliable on weak sub-carriers, creating a lower
over-all data rate.
Pass/Fail Test
Set up common test limits, or sets of limits, for each
instrument. Inconsistent settings between base stations
leads to inconsistent network behavior.
RF Measurements
(Option 0046)
Channel Spectrum
Channel Power
Occupied Bandwidth
Power vs. Time
Channel Power
Preamble Power
Data Burst Power
Crest Factor
ACLR
RF Summary
Demodulation
(Option 0047)
Constellation
RCE (RMS/Peak)
EVM (RMS/Peak)
Frequency Error
Carrier Frequency
Base Station ID
Spectral Flatness
Adjacent Subcarrier Flatness
EVM vs. Subcarrier/Symbol
RCE
EVM
Frequency Error
Carrier Frequency
Base Station ID
Modulation Summary
Fixed WiMAX Signal Analyzers
The Spectrum Master features two
Fixed WiMAX measurement modes:
• RF Measurements
• Demodulation
The goal of these measurements is
to increase data rate and capacity by
accurate power settings, ensuring low
out-of-channel emissions, and good signal
quality. These attributes help to create a
low dropped call rate, a low blocked call
rate, and a good customer experience.
Cell site technicians or RF engineers can
make measurements Over-the-Air (OTA)
to spot-check a transmitter’s coverage
and signal quality without taking the cell
site off-line. When the OTA test results are
ambiguous one can directly connect to the
base station to check the signal quality
and transmitter power.
Adjacent Channel Power Ratio (ACPR)
Adjacent Channel Power Ratio (ACPR)
measures how much BTS signal gets into
neighboring RF channels. ACPR checks the
closest (adjacent) and the second closest
(alternate) channels. Poor ACPR can lead
to interference with adjacent carriers
and legal liability. It also can indicate
poor signal quality which leads to low
throughput.
Base Station ID
Base Station ID indicates which base
station is being measured OTA. The
strongest base station at your current
location is selected for measurement.
Wrong values for base station ID lead
to inability to register. If the cause is
excessive overlapping coverage, it also
will lead to poor RCE and low data rates.
Relative Constellation Error (RCE)
RCE, when used Over-the-Air (OTA), is
a test that is ideal for checking received
signal quality. High RCE leads directly to
low data rate, which creates dissatisfied
customers and lowers the data capacity
of the sector. Very high RCE results in
dropped calls, timeouts, and inability
to register.
Adjacent Subcarrier Flatness (Peak)
Adjacent Subcarrier Flatness (Peak) is
measured between one sub-carrier and
the next. Poor flatness will give the weaker
sub-carriers a high bit error rate and lower
capacity. Data will be less reliable on weak
sub-carriers, creating a lower over-all data
rate.
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