Comtec FT213 Manual de usuario descargar pdf (Pagina 16)

P25 Analyzers

The Spectrum Master features two

P25 measurement modes

P25 Analyzer•

P25 Coverage•

The goal of the P25 Analyzer is to provide

technicians with the measurements

needed to assure proper performance

of a P25 transmitter. Six measurement

screens can be presented individually

or 4 at a time to quickly see the overall

performance of a P25 transmitter.

Two P25 demodulators are available

to support C4FM and CQPSK (LSM)

P25 transmitters.

The Summary screen gives a quick

numerical view of a P25 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

P25 transmitter. With Over-the-air

measurements the Eye Diagram can

indicate phase distortion from multipath

Option 0522 adds GPS-based coverage

measurements to the P25 Analyzer. With

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

GPS receiver (Option 0031) installed,

P25 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

P25 Analyzer and P25 Coverage (Options 0520, 0522)

P25 Analyzer Measurements

(Option 0520)

Received Power

Frequency Error

Modulation Fidelity

NAC (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

P25 Coverage Measurements

(Option 0522)

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 P25 transmitter performance.

Summary Display

The Summary display gives a quick numerical view of a

P25 transmitter.

P25 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.

P25 Tab Separated Output

The tab Separated file format supports viewing coverage

measurements with Microsoft Excel or with third party coverage

prediction software.

P25 .kml output

The kml file format supports viewing coverage

measurements with Google Earth as colored push pins.

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