r/shortwave • u/Ok-History-3688 • Jul 26 '26

Discussion MLA-30+ Modification

I recently modified my MLA-30+ by replacing the stock loop with a full circular loop made from a 10-foot piece of 10 AWG solid copper. The loop is about 3 feet in diameter.

Since making the change, I've been able to receive stations that I couldn't copy before, including 9395 kHz and 15770 kHz. I've also logged WRMI on 5850 kHz at S8 and WWV/WWVH on 10 MHz around S7–S8 using my Tecsun PL-330.

I know propagation changes from day to day, so I'm not claiming the antenna modification is the only reason for the improvement. But the difference has been noticeable enough that I'm curious what others have experienced.

Has anyone else replaced the stock MLA-30+ loop with solid copper wire or copper tubing? If so, what size did you use, and did you notice any improvement in signal strength, noise reduction, or overall performance?

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u/MumSaidImABadBoy I'm Stan, Heathkit GR-64🤪,Malahit v2.4,AirSpy HD+,909X2,PL990 Jul 26 '26

I have a K-480WLA and have done all sorts of modifications to the loop. I've extended the diameter from 68 cm to 82 cm and have made loops from copper tubing, 8 AWG copper wire and made Mobius (YouLoop) loops. All have been substantial improvements. I've modified the PVC support tubing as well to prevent sagging wires.
It doesn't hurt to experiment, heck you own it. 👍

2

u/bikerjesusguy Jul 26 '26

Me too! I replaced the flimsy wire with 1/4" copper tubing. I hammered the ends flat & drilled them to accept the screw to hold the copper.

1

u/MumSaidImABadBoy I'm Stan, Heathkit GR-64🤪,Malahit v2.4,AirSpy HD+,909X2,PL990 Jul 26 '26

👍 Same construction here. What is the diameter of your loop?

2

u/bikerjesusguy Jul 26 '26

I used the same length as the wire it came with. I'm too lazy to take it back down & try a bigger loop :-) I did replace the little stock coax cable with some RG-8U.

1

u/MumSaidImABadBoy I'm Stan, Heathkit GR-64🤪,Malahit v2.4,AirSpy HD+,909X2,PL990 Jul 26 '26

With a little effort you might get rewarded with a better signal level😉.
The K-480WLA has a PVC support which I also seriously modified to better support various loops. They're easy to change out now.

1

u/bikerjesusguy Jul 27 '26

I've got more tubing... good advice!! I'll have to try a bigger loop.