COMTEK COM-LI-11140 Line Isolators COM-LI-11140

Additional Information

COMTEK COM-LI-11140 Line Isolators are based on the Jerry Sevick, W2FMI design to prevent unwanted RFI in 50 ohm, coaxially fed antenna systems. They provide excellent feedline decoupling and low loss performance from 1 to 60 MHz. COMTEK Line Isolators are power-rated for 2 kW continuous, 5 kW intermittent duty, with significantly higher common mode impedance and a larger effective core area than similar line isolators, including conventional enameled wire or bead baluns.

COM-LI-11140 Line Isolators provide these benefits:
- Higher power handling with lower loss – delivers more RF power to the antenna
- Improved antenna bandwidth – easier on the radio and tuner
- Compensate for a less than optimal ground system – stop feedline radiation
- Reduced RFI – less interference to and from your radio

If you are having trouble with RF interference, such as disturbing audio, video or computer equipment in your house or your neighbors', a "hot" mic or audio distortion while transmitting, then it is likely that your feedline is acting like part of your antenna system. While most common advice is to improve the station's RF ground, the root of the problem is poor isolation of the feedline from antenna currents.

COMTEK Line Isolators are excellent feedline current chokes that may be used with many types of 1.8 through 50 MHz antennas including beams, dipoles, verticals, verticals with elevated radials, center-fed vertical dipoles and other antennas. Normally, a COMTEK Line Isolator is installed at the antenna end of the feedline. This will substantially reduce unwanted feedline radiation or unwanted signals without the need for an improved antenna ground system. This is especially true for center-fed verticals or any antenna where the feedline parallels an active antenna element. In other cases, as the coax feedline travels through the near-field of the antenna, the current can be re-introduced to the feedline after the balun. In those cases, where the SWR is low, reduce feedline radiation and improve reception with a COMTEK Line Isolator installed at the shack end of the feedline.

The COMTEK COM-LI-11140 Line Isolators come in a NEMA case with gasket mounted PTFE / Silver SO-239 connectors. Both ends of COMTEK Line Isolators are isolated SO-239 connectors. These Line Isolators are not affected by moisture and may installed and used outdoors in all types of weather including heavy rain, when positioned vertically so water or condensation will drain from the case through the four small weep holes located on the bottom. However, COMTEK Line Isolators may not be immersed in water.

For mounting a COMTEK Line Isolator directly to a boom, pipe or wall, order DXE-BMB-4P, a custom made, patented* Balun Mounting Bracket and Stainless Steel Hardware Kit. When used with optional DXE-ECLS Stainless Steel Band Clamps with Studs, you can mount this Balun Mounting Bracket on a boom or pipe ranging in size from 1/2 in. through 3-1/4 in. The DXE-BMB-4P may be mounted to a wall or wooden post using the appropriate size user-supplied wood screws.
*US Patent No. D597,086

Stop common mode current on the feedline and prevent RFI with COMTEK COM-LI-11140 Line Isolators from DX Engineering. Order yours today!

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