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Spectrum Master™ MS2720T Spectrum Analyzer Features

WiMAX Fixed/Mobile Measurements (Option 885)

RF Measurements

Channel Spectrum

Channel Power

Occupied Bandwidth

Power vs. Time

Channel Power

Preamble Power

Downlink Burst Power (Mobile only)

Uplink Burst Power (Mobile only)

Data Burst Power (Fixed only)

Crest Factor (Fixed only)

ACPR

RF Summary

Demodulation (10 MHz maximum)

Constellation

RCE (RMS/Peak)

EVM (RMS/Peak)

Frequency Error

Carrier Frequency

CINR (Mobile only)

Base Station ID

Sector ID (Mobile Only)

Spectral Flatness

Adjacent Subcarrier Flatness

EVM vs. Subcarrier/Symbol

RCE (RMS/Peak)

EVM (RMS/Peak)

Frequency Error

CINR (Mobile only)

Base Station ID

Sector ID (Mobile only)

DL-MAP (Tree View) (Mobile only)

Modulation Summary

Over-the-Air (OTA) (Mobile)

Channel Power Monitor

Preamble Scanner (Six)

Preamble

Relative Power

Cell ID

Sector ID

PCINR

Dominant Preamble

Base Station ID

Auto-Save with GPS Tagging and Logging

Pass/Fail (User Editable)

Pass Fail All

Pass/Fail RF

Pass/Fall Demod

Measurements

Channel Power

Occupied Bandwidth

Downlink Bust Power

Uplink Bust Power

Preamble Power

Crest Factor

Frequency Error

Carrier Frequency

EVM

RCE

Sector ID (Mobile)

WiMAX Fixed/Mobile Measurements

The Spectrum Master features two

Fixed WiMAX and three Mobile WiMAX

measurement modes:

• RF Measurements

• Demodulation (up to 10 MHz)

• Over-the Air Measurements (OTA)

(Mobile only)

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.

Cell ID, Sector ID, and Preamble

(Mobile WiMAX)

Cell ID, Sector ID, and Preamble show

which cell, sector, and segment are being

measured OTA. The strongest signal is

selected automatically for the additional

PCINR and Base Station ID measurement.

Wrong values for cell, sector and segment

ID lead to dropped handoffs and island cells.

If the cause is excessive coverage, it also

will lead to large areas of low data rates.

Error Vector Magnitude (EVM)

Relative Constellation Error (RCE)

RCE and EVM measure the difference

between the actual and ideal signal. RCE

is measured in dB and EVM in percent.

A known modulation is required to make

these measurements. High RCE and

EVM causes low signal quality, low data

rate, and low sector capacity. This is

the single most important signal quality

measurement.

Preamble Mapping (Mobile WiMAX)

Preamble Scanner can be used with the

GPS to save scan results for later display

on a map. PCINR ratio can be used for the

strongest WiMAX preamble available at

that spot. The Base Station ID and Sector

ID information are also included so that

it’s easier to interpret the results. Once

PCINR data is mapped, it becomes much

easier to understand and troubleshoot any

interference or coverage issues.

RF Measurement – Preamble Power

High or low values will create larger areas of cell-to-

cell interference and create lower data rates near cell

edges. Low values affect in-building coverage.

Demodulation – Frequency Error

Calls will drop when user’s equipment travels at high

speed. In severe cases, handoffs will not be possible at

any speed, creating island cells.

Over-the-Air Measurements – PCINR

A low Physical Carrier to Interference plus Noise Ratio

(PCINR) indicates poor signal quality, low data rate and

reduced sector capacity.

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.

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