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.