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DX Engineering Maxi-Core Feedline Current Chokes

DX Engineering Feedline Current Chokes, using Maxi-Core® technology, prevent unwanted RFI by eliminating feedline current and radiation in 50 ohm, coaxially fed antenna systems. They provide excellent feedline decoupling and low loss performance from 1 to 60 MHz and are power rated for 2 kW continuous, 5 kW intermittent on antenna feedlines with an SWR below 2:1. 

The new DXE-FCC050-H05-B has both SO-239 connectors isolated from the aluminum case and no stud, which replaces the original DXE-FCC050-H05-A that had only one isolated connector and a rarely used grounding stud. This inline choke is also known as a Line Isolator, so it works very well when placed at the station end of the feedline or it may be used at the antenna end of the feedline. It behaves as a 1:1 Current Balun, even though it is connected to the antenna feedpoint with a short piece of coaxial cable. 

DX Engineering Feedline Current Chokes have significantly higher common mode impedance and a larger effective core area than similar line isolators, including conventional enameled wire or bead baluns. This results in higher power handling with lower loss, improved antenna bandwidth, and reduced RFI, and compensates for a less-than-optimal grounding system. 

While the most common advice is to improve the station's RF ground, the root of the problem is in the poor isolation of the feedline from antenna currents. In other cases, as the coax feedline travels through the near-field of the antenna, the current can be reintroduced to the feedline after the balun.

Antenna Type Compatibility
Antenna Mounting Type
Vertical, 50 ohm, direct coax feed
Adapter bracket
Yagi, 50 ohm, direct coax feed
Yagi, gamma matched
Log periodic, 50 ohm, direct coax feed


Frequency Range: 1.8-60 MHz
Ratio: 1:1
Termination Impedance (Ohms): 50
Termination Location: Top and bottom
Termination Type: UHF female, SO-239
Enclosure Type: Outdoor formed box
Enclosure Material: Aluminum
Core Type: Patented Maxi-Core®
Power Handling (CW/SSB): 2 kW/5 kW
Enclosure Width: 2.750 in.
Enclosure Height: 9.375 in.
Enclosure Depth: 2.250 in.
Quantity: Sold individually.
Notes: US Pat. No. 7,573,349. Should be mounted with a Balun Mounting Bracket to remove coax and antenna strain from the balun.
Lowest Band of Operation: 160 meters
Highest Band of Operation: 6 meters

dxe fcc050-h05-b

dxe fcc050-h05-b

dx engineering

pdf DXE-FCC050-H05-B Instructions

DX Engineering Maxi-Core Feedline Current Chokes

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