Products & Product Reviews

Choosing the Right Coaxial Cable Part 3: 400MAX Low-Loss 50-ohm Coax

In Part 3 of our series on Choosing the Right Coaxial Cable, we turn to one of DX Engineering’s most popular offerings: premium 400MAX Low-Loss 5o-ohm Coaxial Cable, or, in the words of one very satisfied customer, “The Cadillac of Coax.” Read on to find out why it’s earned this impressive distinction, and be sure to check out these coax varieties covered in parts 1 and 2: DX Engineering RG-214 Double-Shielded 50-ohm Coaxial Cable and RG-400 High-Isolation Double-Shielded 50-ohm Coaxial Cable.

400MAX Low-Loss Cable 50-ohm Coaxial Cable


  • 10 AWG stranded copper center conductor
  • Gas-injected foam polyethylene dielectric
  • High level shielding from bonded aluminum tape covered by a tinned copper shield braid
  • Special Type III-A, UV-resistant polyethylene waterproof jacket


  • Ideal for outdoor applications, particularly direct-bury
  • Especially suited for high-power amateur stations, providing a lower loss solution for long cable runs at any power level

Installing Connectors:

Watch this video on Crimp Connector Cable Prep of 4o0MAX and LMR-400 cables using the DX Engineering Prep Tool Kit for Crimp Connectors (DXE-UT-KIT-CC1).

Availability: 400MAX is available as assemblies in 3, 6, 9, 12, 18, 25, 50, 75, 100, 125, 150, 175, and 200 foot lengths with either PL-259 or Type N male connectors. All cable assemblies are hi-pot tested and heat-shrink weather-sealed for the ultimate in service longevity. You can also purchase it by the foot, in 500 or 1,000 foot spools, or fully customized by using DX Engineering’s Custom Cable Builder.

What do hams say?

Five Stars: “I have come to expect excellent quality from DX Engineering’s products and I wasn’t disappointed. In addition, the cable arrived very quickly and in good condition.”

Five Stars: “My IC-7300 went from a lot of noise to being very quite. I am very pleased with my purchase.”

Five Stars: “Great cable at the right price. I use this for shack to tower, jumpers, and runs up to 100 feet on local site commercial repeater installations. Works great, low loss, and never had a problem with this cable. Buy in bulk 500-1,000 foot rolls.”

Five Stars: “I have had this cable buried for over two years and have not experienced any problems with it at all. It is flexible enough to get it around corners and bends where and when you need it to.”

Whether you’re a do-it-yourselfer or prefer your coaxial ready to install right out of the package, DX Engineering offers three solutions to accommodate your preference:

Not sure what coaxial cable is right for your station? Looking for tips on maintaining and preparing your cables? Check out these OnAllBands articles:

You’ll find coaxial cable; connectors; cable prep tools and kits; cable ties, loops, and wraps; and more at

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