Model M-331

Mini RFI Locator

The M-331 Mini Locator delivers interference detection in an ultra-portable design.
Purpose-built for field crews, it integrates a high-sensitivity receiver, calibrated LCD signal meter, speaker, and four-element Yagi antenna into one handheld unit. Optimized for gain and directional accuracy, the M-331 enables technicians to quickly pinpoint sparking power line hardware that disrupts radio, television, and data signals.

By scanning lines and tracking peak noise readings in decibels, the M-331 makes pole-to-pole comparisons fast, accurate, and repeatable. A frequency/RF gain control, digital ignition filter, and selectable dB readouts ensure precise measurements in varied environments. Built to resolve interference affecting communications, broadcast, and broadband systems, the M-331 equips crews to restore signal integrity whether the source is an arcing hot clamp, leaking lightning arrestor, or cracked insulator.

Features

Integrated high-sensitivity receiver with 
Four-element Yagi antenna
Calibrated LCD signal strength meter
Selectable dBm, dBmV, or dBμV display
Frequency and RF gain control
Digital ignition filter
Built-in speaker
Headphone jack for audio monitoring
Adjustable volume control
Lightweight handheld design
Carrying case included

Specifications

Type RFI Locator
Frequency 320–340 MHz Tunable
Receiver High-Sensitivity Directional Receiver
Antenna Four- Element Yagi
~ 8dBi Gain
Input Connector BNC
Signal Display LCD Signal Strength Meter
Readout Selectable dBm, dBmV, or dBμV
Audio Output Built-In Speaker + Headphone Jack
Filter Digital Ignition Filter
Controls Frequency, Volume, RF Gain, Ignition Filter, Power

Mechanical

Dimensions 18.5" × 2.5" × 5.5"
Weight Less than 2 lbs.

Power

Power Source One 9V Alkaline Battery
Battery Life Approximately 8 Hours of Operation

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