TVI & RFI Suppression

The RADIO WORKS
The RFI QUICK FIXtm
Line Isolators
The first line of RFI defense.
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Our Line Isolators solve problems that have eluded solutions for years.
MFJ-931
MFJ-931 Artificial RF Ground

Creating an artificial RF ground effectively places your rig near actual earth ground potential even if your rig is on the second floor or higher where no earth ground is possible. It reduces chances of TVI & RFI. The MFJ-931 creates an artificial RF ground. It resonates a random length of wire thrown along the floor and produces a tuned counterpoise. When used with a conventional ground system, the MFJ-931 places a far away RF ground directly at your rig -- no matter how far away it is. It reduces the electrical length of the ground connection wire to virtually zero by tuning out its reactance. Tune with the built-in RF ammeter. 1.8 - 30 MHz.
MFJ-704

MFJ-704 Low Pass Filter

  • Passband - 1.8 - 30 MHz
  • Cutoff frequency - 40 MHz
  • Powr capacity - 1500 watts
  • Impedance - 52 ohms

MFJ -701 RFI-free Choke Kit

MFJ-701


Eliminate RFI from .5 MHz to 200 MHz. These break-apart toroids have a wonderful reputation at solving difficult RFI problems. Wrap power cords, coax, input/output line onto these cores and get ready for amazing results.

Package of four core sets

MFJ-711 High Pass Filter
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  • Passband - 52-550 MHz
  • Attenuation: >40 dB @ 30 MHz
  • Impedance: 75 ohm unbalanced or 300 ohms balanced.
  • Insertion Loss: <0.5 dB at 52-550 MHz

The MFJ-711 can drastically reduce or eliminate most TV interference coming from nearby radio transmitters.

Install between your cable and VCR or TV set. Reduces signal received from transmitters operation below 30 MHz.

An MFJ exclusive shield-breaking circuit prebents your antenna cable from acting like an HF antenna, thereby reducing or eliminating the chance of harmful TVI interference.
MFJ-260C Dummy Load

MFJ-260
MFJ-260C
300 watt, air cooled non-inductive resistor. Full load for 30 seconds. Derated curve to 5 minutes. SWR < 1.5:1 @ 150 MHz & < 1.1:1 @ 30 MHz.
MFJ-264 Dummy Load

MFJ-764
MFJ-264
50 ohm, 1500watts for 10 seconds, 100w continuously. 1.8 - 650 MHz. Dry, air cooled.

For the latest prices and products, follow this link to our General Catalog

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