The MFJ-784B is a powerful external DSP noise reduction filter designed to dramatically improve the intelligibility of weak signals in noisy conditions. This second-hand unit is fully tested and in good working order—ideal for enhancing the receive audio in your existing radio setup. The MFJ-784B targets and removes unwanted noise, adjacent channel interference, heterodynes, and background static using advanced digital signal processing. With complete control over bandwidth, notch filtering, and noise reduction, this compact unit is a valuable tool for DXers, contesters, and SWLs. Key Features: Used condition – thoroughly tested and functional Works with any transceiver or receiver with audio output Built-in adaptive DSP filtering Adjustable bandwidth (40 Hz to 6 kHz) Programmable notch filters eliminate carriers & tones Noise blanker and noise reduction features Compact, easy-to-integrate desktop unit Operates on 12V DC (power cable included)