MFJ's tunable super DSP filter automatically eliminates heterodyne, reduces noise and interference simultaneously on SSB, AM, CW, packet, AMTOR, PACTOR, RTTY, SSTV, WeFAX, FAX, weak signal VHF, EME, satellite -- nearly any mode.

You get MFJs tunable FIR linear phase filters that minimize ringing, prevent data errors, and have "brick wall" filter response with up to 57 dB attenuation 75 Hz away.

Only MFJ gives you 5 tunable DSP filters. You can tune each lowpass, highpass, notch, and bandpass filter including optimized SSB and CW filters. You can vary the bandwidth to eliminate interference.

Only MFJ gives you 5 factory pre-set filters and 10 programmable pre-set filters that you can customize. Instantly remove QRM with the turn of a switch!

You get MFJs automatic notch that finds and eliminates multiple heterodynes.

You get MFJs adaptive noise reduction. It silences background noise and QRN so much that SSB sounds like local FM.

The automatic notch and adaptive noise reduction can be used with all relevant tunable pre-set filters.

Automatic gain control (AGC) keeps the audio level constant during the signal fade.

Automatic notch filter

MFJ's automatic notch filter searches for and eliminates multiple heterodynes in milliseconds. It's so fast, that even interfering CW and RTTY signals are eliminated.

With up to 50 dB attenuation, you'll copy stations otherwise masked by heterodyne.

Voice signals aren't degraded because the notch is extremely narrow.

Turn on the automatic notch and you'll never hear unwanted heterodyne or tuner-uppers.

You can selectively remove unwanted tones using the two manually tunable notch filters -- an MFJ exclusive. Knock out unwanted CW stations while you're on CW.

Adaptive noise Reduction,

Noise reduction silences background noise, reduces fatigue, and makes signals readable.

Noise reduction works in all filter modes and on all random noise -- white noise, static, impulse, ignition noise, power line noise, hiss.

The LMS algorithm reduces noise by 20 dB and is adjustable to prevent distortion.

Tunable highpass/lowpass filters

For voice and data, nothing beats MFJs exclusive tunable highpass/lowpass FIR linear phase "brick wall" filters.

Tune lower cutoff 200 to 2200 Hz and upper cutoff 1400 to 3400 Hz and create custom filters for Voice, Data, and other modes.

Signals just 75 Hz away literally disappear -- they are reduced to 57 dB! Unlike other filters, speech is not distorted by unequal time delay.

When signals are weak, you can improve copy by removing noisy high and low speech frequencies that contain little information.

"Slice-off" overlapping SSB signals, hum, pulses, rasp, and other low-frequency noises.

Tunable bandpass filters

Narrowband signals like CW and RTTY jump out of QRM when you switch in MFJs exclusive tunable FIR bandpass filters.

You can tune the center frequency from 300 to 3400 Hz, and vary the bandwidth from 30 Hz to 2100 Hz -- from super-tight CW filters to wide razor-sharp Data filters.

As you reduce bandwidth, interfering signals disappear -- they're down 47dB, 60 Hz away.

These linear phase filters don't distort signals with unequal time relays -- even the narrowest 30 Hz bandwidth doesn't ring.

One position gives you two tunable filters you can use together. For example, tune one to mark, one to space, and set the bandwidth tight for an incredibly sharp RTTY filter.

15 pre-set filters -- factory set or your program.

You can select from 15 pre-set filters. Use SSB, AM, CW, packet, AMTOR, PACOTR, RTTY, SSTV, WeFAX, FAX, or any mode.

If you don't like our preset filters, you can program your own -- an MFJ exclusive! Save center frequency/bandwidth, lowpass/highpass cutoffs, auto/manual notch, noise reduction -- all filters setting -- in 10 programmable filters.

Only MFJ gives you both tunable filters and pre-set filters customizable for any mode.

Plus More...

Bypass mode lets you hear the entire unfiltered signal. 2.5-watt amplifier, volume control, input level control, speaker jack, PTT sense line, line-level output.

Plugs between your transceiver or receiver and external speaker or headphones. Use 12 VDC or 110 VAC with MFJ-1312D. Cable pack, MFJ-5184, includes a receiver cable, DC cable, and 2 open-end TNC cables.

Firmware Upgrade

For MFJ-784 users, order MFJ-55, Most software features of the new MFJ-784B.