KMR400 Coax Cable

I have installed this to my HF radio antennas and am very happy with its construction, handling, and performance. The center conductor is copper-clad aluminum and so it is a bit lighter in mass than that with pure copper center conductors, and is still a substantial and low loss cable for use at HF frequencies. While the product photo shows a wooden spool, that is not included in the order. What one will get is a nicely wound length of coax for termination by the user. I used crimp-on fittings and am very pleased with this coax cable. No problems or issues at all - it is a drop-in replacement for LMR-400 and RG-8 coax. Recommended! Great value for its price.

I ran it from my office, inside an interior wall cavity that did not have any any other cables/wires in it. It runs from about 1 foot off my main floor's floor (at the height of a normal outlet), through the second story floor, and into the attic space where it goes at a diagonal towards the highest peak of the roof, there's still a bit of slack, although not a huge amount to spare.I connected it to the VHF/UHF J-Pole antenna that is mounted to a support post that leads to the peak of my roof line. I've seen no measurable difference on my SWR meter between having a shorter 10ft cable that I tested the Jpole with while building it as compared to the 50ft of this cable. If anything, I've actually seen better SWR because nothing is near the antenna to potentially screwing up the radiation pattern.

The KMR400 coax has the same specifications as the Times Microwave standard LMR400 cable but at about 1/3 the price. This cable is constructed similarly to the LMR400 and is similarly a very stiff cable. The cable is not like the Times Microwave UltraFlex version which is much more flexible and has a slightly larger power loss.The connectors solder easily to the KMR cable, but the outer shield wire seems frizzier the LMR. I measured the coax cable loss with a MFJ 259 analyzer and verified the loss was the same as specified which is the same as the LMR.I use this cable for all feedlines outside my ham radio shack. Inside, I use the LMR400 UltraFlex cable. For portable antennas, shorter feedlines and lower frequencies I use the MOOKEERF coax found on Amazon. The MOOKEERF cable is smaller, has more loss and is cheaper.

exactly as advertised

This cable performs on par with big name .400 class coax. I was able to test all aspects of the cable and was pleasantly surprised to find all specs to be as published. This is a great product and will buy again. I use this as feed line to all of my HF and VHF antennas. I hope to see long term performance from KMR-400.

Using this for a 2 meter ham radio application. Running from my roof to my basement and didn't want a poor SWR due to mediocre cable. Easy to work with and jacket and shielding are well made.

This coax is acceptable. But it does not perform as well as times microwave LMR 400 up in the 440 band UHF and higher. But it seems good for HF/VHF with minimal loss. It doesn’t meet ALL the specs that they give though and I have tried multiple pieces with my test equipment and have found it to not meet there specs, especially in the UHF band when I do a sweep test. But like I said, it is acceptable for HF and VHF, it is just as good as RG 213 or LMR 400 in that frequency range. Most ham radio guys do not buy their coax from Amazon, so it will work perfectly fine for the guys on CB radio that do shop on here. I was just checking out to see if there are any bargains available.

It works - I actually split it into 2/50' for the project that I had on hand. Prior to splitting I ran a loss test and it's a tad bit worse then the numbers they show - but hey for .68 a foot in reality I'll take the loss over 7.68 a foot any day! UNLESS your a OCD ham you will never know the difference and you'll still hear that RUxXx station.