Atec Anritsu-MT8221B - Manual (Page 5)

5
BTS Master™ Base Station Analyzer Features
Spectrum Analyzer
Measurements
One Button Measurements
Field Strength – in dBm/m 2 or dBmV/m
Occupied Bandwidth - 1% to 99% of power
Channel Power - in specified bandwidth
ACPR - adjacent channel power ratio
AM/FM/SSB Demodulation - audio out only
C/I - carrier-to-interference ratio
Gated Sweep – Option 0090
I/Q Waveform Capture – Option 0024
Sweep Functions
Sweep
Single/Continuous, Manual Trigger, Reset,
Minimum Sweep Time
Detection
Peak, RMS, Negative, Sample, Quasi-peak
Triggers
Free Run, External, Video, Change Position,
Manual
Trace Functions
Traces
1-3 Traces (A, B, C), View/Blank, Write/Hold
Trace A Operations
Normal, Max Hold, Min Hold, Average,
Number of Averages, (always the live trace)
Trace B Operations
A  B, BC, Max Hold, Min Hold
Trace C Operations
A  C, BC, Max Hold, Min Hold, A - B  C,
B - A  C, Relative Reference (dB), Scale
Marker Functions
Markers
1-6 Markers each with a Delta Marker, or
Marker 1 Reference with 6 Delta Markers
Marker Types
Fixed, Tracking, Noise, Frequency Counter
Marker Auto-Position
Peak Search, Next Peak (Right/Left),
Peak Threshold %, To Channel, To Center,
To Reference Level, Delta Marker to Span
Marker Table
1-6 markers’ frequency & amplitude plus
delta markers’ frequency offset & amplitude
Limit Line Functions
Limit Lines
Upper/Lower, Limit Alarm, Default Limit
Limit Line Edit
Frequency, Amplitude, Add/Delete Point,
Add Vertical, Next Point Left/Right
Limit Line Move
To Current Center Frequency, By dB or Hz,
To Marker 1, Offset from Marker 1
Limit Line Envelope
Create, Update Amplitude, Number of
Points (41), Offset, Shape Square/Slope
Limit Line Advanced
Absolute/Relative, Mirror, Save/Recall
Spectrum Analyzer
The BTS Master features the most powerful
handheld spectrum analyzer for field use
with unmatched performance such as:
• Sensitivity
• Dynamic Range
• Phase Noise
• Frequency Accuracy
• Resolution Bandwidth (RBW)
The goal of the Spectrum Analyzer’s
measurements is to be able to monitor,
measure, and analyze RF signals and
their environments. It finds rogue signals,
measures carriers and distortion, and
verifies base stations’ signal performance.
It validates carrier frequency and identifies
desired and undesired signals.
Simple But Powerful
The BTS Master features dedicated
routines for one-button measurements and
for more in-depth analysis the technician
has control over the setting and features
not even found on lab-grade benchtop
spectrum analyzers, for instance:
• Multiple sweep detection methods –
true RMS detector, quasi-peak, …
• Multiple traces and control –
three traces, trace math, …
• Advanced marker functions –
noise marker, frequency counter, …
• Advanced limit line functions –
one-button envelope creation, relative, …
• Save-on-Event – automatically saves
a sweep when crossing a limit line
• Gated sweep - view pulsed or burst
signals only when they are on, or off
• I/Q waveform capture - transfer
captured signals for further analysis
and troubleshooting
The BTS Master automatically sweeps as
fast as possible for the selected settings
consistent with accurate results.
GPS-Assisted Frequency Accuracy
With GPS Option 0031 the frequency
accuracy is 25 ppb (parts per billion).
After the GPS antenna is disconnected,
the accuracy is 50 ppb for three days. Also
all measurements can be GPS tagged for
exporting to maps.
Rx Noise Floor Testing
The BTS Master can measure the Rx Noise
Floor on the uplink of a base station using
the channel power measurement. An
elevated noise floor indicates interference
and leads to call blocking, denial of
services, call drops, low data rate, and
low capacity.
Occupied Bandwidth
Excessive occupied bandwidth can create interference
with adjacent channels or be a sign of poor signal
quality, leading to dropped calls.
Adjacent Channel Power Ratio (ACPR)
High ACPR will create interference for neighboring
carriers. This is also an indication of low signal quality
and low capacity, which can lead to blocked calls.
Carrier-to-Interference (C/I)
Low C/I ratios will cause coverage issues including
dropped calls, blocked calls, and other handset
reception problems.
Gated Sweep – Option 0090
The gate is in the off-time of this WiMAX signal, which
would let the user see interfering signals or user signals
when the base station is not transmitting.