Comtec FT213 Uživatelský manuál stáhnout pdf (Strana 17)

NXDN Analyzers

The Spectrum Master features two

NXDN measurement modes

NXDN• Analyzer

NXDN• Coverage

The goal of the NXDN Analyzer

measurements is to provide technicians

with the measurements needed to

assure proper performance of a NXDN

transmitter. Six measurement views can

be presented individually or 4 at a time

to quickly see the overall performance of

a NXDN transmitter.

Two NXDN demodulators are available

to support 6.25 kHz and 12.5 kHz

transmitters.

The Summary display gives a quick

numerical view of a NXDN transmitter.

The spectrum display gives an indication

if there are interferers present that may

degrade the bit error rate.

The Eye Diagram View provides an

indication of baseband fidelity of a

NXDN transmitter. With Over-the-air

measurements the Eye Diagram can

indicate phase distortion from multipath

Option 0532 adds GPS-based coverage

measurements to the NXDN Analyzer.

With a GPS antenna (P/N 2000-1258-R)

and GPS receiver (Option 0031) installed,

NXDN RSSI, BER and Modulation Fidelity

measurements are logged to a file on

external USB memory once per second

(approximately) and attached to the GPS

location and time. The file is appended

every 551 measurements to provide one

file up to the USB memory size. Two file

formats are provided, Tab Separated

Value for viewing coverage data with

Microsoft Excel or into third party

coverage prediction software and .kml for

direct viewing with Google Earth.

The kml file format supports viewing

coverage measurements with Google

Earth as colored push pins.

Spectrum Master™ Compact Handheld Spectrum Analyzer Features

NXDN Analyzer and NXDN Coverage (Options 0530, 0532)

NXDN Analyzer Measurements

(Option 0530)

Received Power

Frequency Error

Modulation Fidelity

RAN (hex)

Symbol Rate Error

BER (1011 Hz, O.153, Voice, and Control Channel)

Graphs

Constellation

Linear Constellation

Spectrum (25 kHz span)

Histogram

Eye Diagram

Summary Display

NXDN Coverage Measurements

(Option 0532)

BER

RSSI

Modulation Fidelity

Graphs

RSSI vs. Time

BER vs. Time

Modulation Fidelity vs. Time

Four measurement screen view

The Four Screen view provides a quick overall summary

of NXDN transmitter performance.

Summary Display

The Summary display gives a quick numerical view of

a NXDN transmitter.

NXDN Coverage

The Coverage mode provides view of the BER, RSSI

or Modulation Fidelity in a dual screen view. When Log

Data is turned on all three parameters are logged to

external USB memory along with GPS location and time.

NXDN Tab Separated Output

The tab Separated file format supports viewing coverage

measurements with Microsoft Excel or with third party coverage

prediction software.

NXDN .kml output

The kml file format supports viewing coverage

measurements with Google Earth as colored push pins.

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