The NXDN Analyzer option provides a method to verify the operation of NXDN tower, mobile, and portable radio transmitters. Option 531 includes the ability to display constellation, spectrum, histogram, and eye diagram graphs. In addition, a summary graph displays numeric values of received power, frequency error, modulation fidelity (Mod Fid), bit error rate (BER), symbol deviation, Radio Access Number (RAN), and symbol rate error of the input signal. BER comparisons can be made to the 1031 Hz Standard Tone or the Standard Transmitter Test (O.153) pattern, regular voice traffic using a proprietary algorithm, or a Message Error Rate (MER) can be computed using the control channel messages CRC checking. In addition, estimated BER on the control channel uses a proprietary algorithm.

The LMR Master will analyze input signal strengths from +33 dBm (2.0 watts) down to levels approaching the sensitivity of NXDN radios, automatically adjusting the input sensitivity based on input levels.