Land Mobile Radio Analyzer and Coverage Measurement Guide : PTC-ITCR Analyzer (Option 721)
 
PTC-ITCR Analyzer (Option 721)
 
Introduction
Setup Procedure
Direct Connect to the Transmitter
Over-the-Air (OTA) Analysis Setup
Using the Signal Generator for Receiver or OTA Analysis
PTC-ITCR Analyzer Graphs
Constellation and Linear Constellation
Spectrum Graph
Histogram Graph
Eye Diagram
Summary Table
PTC-ITCR Analyzer Main Menu Map
Frequency Menu
Signal Standard Menu
Amplitude Menu
Vertical Scale Menu
Setup Menu
Setup (2/2) Menu
Measurement Menu
Display Menu
Sweep Menu
Measure Menu
Trace Menu
Limit Menu
Other Menus
Introduction
The PTC-ITCR Analyzer option provides a method to verify the operation of ITCR Positive Train Control (PTC) systems (PTC-ITCR). PTC-ITCR is an integrated communication and information system for controlling train movements. Option 721 includes the ability to display constellation, spectrum, histogram, and eye diagram graphs. In addition, a summary table displays numeric values of received power or burst power, PEP (Peak Envelope Power), frequency error, EVM (Error Vector Magnitude), bit error rate (BER), IQ (In phase and Quadrature) offset, phase and magnitude error, and symbol rate error.
EVM is a measure of how far the constellation points are from the ideal locations. BER is a comparison against standard PTC-ITCR test patterns – either O.153 or PN9. The available Symbol Rates are Half Rate (8 ksps) and Full Rate (16 ksps). IQ Offset is a combination of phase imbalance (the measured phase between I and Q arms versus an ideal 90° phase difference) and amplitude variation between the two arms.
The LMR Master will analyze input signal strengths from +33 dBm (2.0 watts) down to levels approaching the sensitivity of PTC radios, automatically adjusting the input sensitivity based on input levels.
For information on coverage, see LMR Coverage Mapping.