The NBFM Analyzer option provides a method to verify the operation of analog FM land mobile radios and to confirm that such radios are compliant to regulatory standards for spectrum power.

The LMR Master NBFM measurements include the ability to display frequency spectrum, audio spectrum, and the audio waveforms. In addition, a summary graph displays numeric values of Carrier Power, Carrier Frequency, Frequency Error, Frequency Deviation (peak, RMS, or Average), Modulation Rate, Signal to Noise and Distortion ratio (SINAD), Total Harmonic Distortion (THD), Occupied Bandwidth, and squelch/tone type (CTCSS, DCS, DTMF) of the input signal.

Other NBFM measurements include coverage mapping, metering of 20 dB Quieting, and metering of 12 dB SINAD.

NBFM Coverage measurements are described in LMR Coverage Mapping. NBFM coverage allows drive‑testing of analog FM LMR systems while measuring and mapping RSSI, SINAD, External SINAD, and THD parameters.

Anritsu also supports Narrowband FM Analog (NBFM Analyzer) and digital transmitter Land Mobile Radio technologies including P25 – Project 25 or APCO-25 (P25 Analyzer (Option 521)), P25 Phase 2 (P25 Phase 2 Analyzer (Option 521)), NXDN™ – Very Narrowband Common Air Interface (NXDN Analyzer (Option 531)), dPMR – Digital Private Mobile Radio (dPMR Analyzer (Option 573)), TETRA – Terrestrial Trunked Radio (TETRA Analyzer (Option 581)), DMR – ETSI Digital Mobile Radio (DMR Analyzer (Option 591)), PTC-ITCR Positive Train Control (PTC-ITCR Analyzer (Option 721)) and PTC-ACSES (PTC-ACSES Analyzer (Option 731)).

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