DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes DXE-MC20-1-1
SKU Part Number: DXE-MC20-1-1
DX Engineering Maxi-Core® 20 - 1:1 Current Choke Balun DXE-MC20-1-1 Maxi-Core® 20 Baluns and Feedline Chokes reduce or eliminate currents on...
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DX Engineering Maxi-Core® 20 - 1:1 Current Choke Balun DXE-MC20-1-1


Maxi-Core® 20 Baluns and Feedline Chokes reduce or eliminate currents on the outside of your feedline allowing you to hear and to be heard much better. They keep more RFI/BCI out of your antenna and receiver and transfer more of your transmitted signal to the antenna for higher efficiency, the best antenna pattern and maximum performance. Hear and be heard with DXE Maxi-Core® 20 Baluns and Feedline Chokes!


The DXE-MC20-1-1 is the standard 1:1 balun for use on antennas with a 50 ohm feedpoint impedance. It is the perfect choice for resonant dipoles, beams and other antennas that are normally operated below a 3:1 SWR.

For other antenna and ladder line applications, click Suggested Parts above or click here: Balun/Choke Selection Chart. Descriptions of each Maxi-Core® 20 model appear below.

DX Engineering Maxi-Core® 20 1:1 Balun

DXE-MC20-1-1 Maxi-Core® 20 1:1 Balun

 


Maxi-Core® 20 Baluns feature 1/4-20 stainless steel hardware and a high quality silver-plated PTFE dielectric SO-239 (UHF female) input connector. The SO-239 connector limits power handling to 5 kW or less at low SWR and reduced power at elevated SWR. These baluns and feedline chokes exhibit very low insertion loss and inherently low SWR. Maxi-Core ® 20 Baluns are built into a convenient weather resistant NEMA enclosure that is mounted easily with optional brackets. They have weep holes at all four corners of the “bottom” side of the enclosure, so they work properly for vertical or horizontal mounting for all types of antennas.


Optional mounting brackets and plates, also listed in the suggested parts tab, include:

DXE-WA-BMB for using this balun on wire antennas, which allows the addition of a Coax Strain Relief

DXE-MC20K-BRKT for mounting this balun at a vertical or on a beam antenna, mounted perpendicular to a metal boom or support for better performance


Signaling a new era of RF performance across the 1.8 to 54 MHz frequency range, DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes handle full-legal-power-plus and provide higher common mode impedance (CMI) across a greater frequency range than competing models and even previous DX Engineering and Comtek models. Years of R&D coupled with major advancements in test equipment and techniques combined with custom ferrite materials have allowed our engineering team to design the DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes.


Common mode impedance (CMI), also known as choking impedance, is a measure of how well a Balun or Feedline Choke reduces exterior RF currents traveling through it and on the outside of the coaxial cable. Unwanted RF signal and noise currents that travel on the outside of the coax will re-radiate signals directly to your antenna and then travel to your receiver. Even with a Feedline Isolator (choke) or Balun at the antenna end of the transmission line, many times a Feedline Isolator is necessary at the transceiver side in order to squelch the noise currents picked up by the feedline on the way to the radio.


Modern testing methods clearly show that coiled coax, sometimes known as an “ugly balun,” and inexpensive baluns provide minimal CMI over just narrow frequency segments of the HF range. DX Engineering Maxi-Core® 20 Baluns maintain a much higher CMI over the 160 meter through 6 meter bands.


Maxi-Core® 20 Baluns and Chokes have high CMI across the AM Broadcast band and the HF/6M spectrum, which is essential to provide sufficient suppression of unwanted transmitted and received RFI/BCI current on the feedline shield exterior. Hear and be heard with DXE Maxi-Core® 20 Baluns and Feedline Chokes!


NOTE: Polarity markings on baluns are used for matching phase on balanced antennas when stacking beams for a phased array. Also, the positive terminal should be connected to a vertical element or Inverted-L and the negative terminal should be connected to the radial system, counterpoise, ground plane or ground. For most regular applications on a single balanced antenna, including beams, dipoles and most wire antennas, balun polarity doesn't matter.


DXE-MC20-1-1 Maxi-Core® 20 - 1:1 Current Choke Balun - For all HF-6m balanced antennas with a 50 ohm feedpoint, including resonant dipoles, loops, Yagis, beams, etc.

DXE-MC20-FC  Maxi-Core® 20 - 1:1 Feedline Choke – This high CMI line isolator is perfect for use in line on 50 ohm coaxial feedlines, at the antenna, at the tower and at the shack end of the feedline.

DXE-MC20-1-1T  Maxi-Core® 20 - 1:1 Current Choke Balun – This 1:1 "T" model is for force feeding antennas with a tuner. Use it at the end of ladder line of any impedance or mounted on a coax fed non-resonant antenna. This model tolerates operation at high SWR on non-resonant multi-band antennas. Typically, for higher efficiency, this is the balun to use at the end of any impedance ladder line that is feeding a non-resonant doublet. If higher losses are acceptable, it may be mounted on a coax fed antenna. This model tolerates operation at high SWR on non-resonant multi-band antennas. But, in either case, not all frequencies are available on a single dipole, as this is a choke balun, not a tuner.

DXE-MC20-C4-1  Maxi-Core® 20 - 4:1 Current Choke Balun - For use on antennas with a 200 ohm feedpoint and on any impedance ladder line, especially antenna systems with higher impedance. This model tolerates operation at high SWR on non-resonant multi-band antennas.

DXE-MC20-V4-1   Maxi-Core® 20 - 4:1 Voltage Balun -  A 200 ohm to 50 ohm transformer for use on random long-wire and OCF antenna applications. This true voltage balun is intentionally designed with low CMI for antennas that need a transformer without RF choking for easier antenna tuner operation. This model tolerates moderately elevated SWR.





  • Brand:DX Engineering
  • Manufacturer's Part Number:DXE-MC20-1-1
  • Part Type:Baluns, UNUNs and Chokes
  • Product Line:DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes
  • DXE Part Number:DXE-MC20-1-1

  • Frequency Range:1.8-54 MHz
  • Ratio:1:1
  • Termination Impedance (Ohms):50
  • Termination Location:Top
  • Termination Type:1/4-20 studs/Wing nuts
  • Enclosure Type:Weatherproof NEMA box
  • Enclosure Material:Plastic
  • Core Type:Coax/Dual core
  • Power Handling (CW/SSB):5 kW/5 kW
  • Enclosure Width:4.000 in.
  • Enclosure Height:4.000 in.
  • Enclosure Depth:2.000 in.
  • Quantity:Sold individually.
  • Notes:Power handling is limited by SO-239 connector, especially at high SWR.
  • Lowest Band of Operation:160 meters
  • Highest Band of Operation:6 meters
  • Additional Information
  • Antenna Type Compatibility Antenna Mounting Type
  • Yagi, 50 ohm, direct coax feed Boom
  • Yagi, gamma matched Boom
  • Yagi, hairpin/beta matched Boom
  • Yagi, trap tri-bander Boom
  • Dipole, coax fed, resonant Wire antenna balun bracket
  • Dipole, inverted vee, resonant Wire antenna balun bracket
  • Dipole, multi-band resonant Wire antenna balun bracket
  • Dipole, trap Wire antenna balun bracket
  • Inverted vee, coax fed, resonant Wire antenna balun bracket
  • Loop, vertical, resonant, coax feed Wire antenna balun bracket

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If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

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Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]