Tiny Magnetic Loop - Big DX

Watch on YouTube (Embed)

Show annotations




Genre: Film & Animation

Family friendly? Yes

Wilson score: 0.9915

Rating: 4.994 / 5

Engagement: 5.8555%

K6ARK Portable Radio

Subscribe | 7.47K

Shared May 10, 2021

I took the homebrew QRP 1 m diameter small transmitting loop out to a local summit for some fun and was surprised with some fantastic propagation, on 40 meter nonetheless. This was one of my first DX contacts on the band, and with a small compromise antenna and QRP power, nonetheless.

Small transmitting loop antennas are relatively simple and fun to build. Here's a little helpful info to get you on the right path to building.


Also check out @Amateur Radio VK3YE's videos here on YouTube - he has done lots of work with small transmitting loops.

Here's the hardware I use to make the larger part of the loop. Pretty simple bar-stock aluminum folded out straight and then bent into a circle. Works great!
1/16" x 1/2" Flat Aluminum Bar: https://amzn.to/3trTdAX
Mini project box: https://amzn.to/3h8FeNP
6-32 x 1/2" Stainless Screws: https://amzn.to/3tmqI7G
6-32 Nylock Nuts: https://amzn.to/33lLnyj
#6 Flat Washer: https://amzn.to/3h9YJWy

Feeding and matching a loop takes a bit of trial and error, and some specific electrical components - primarily variable and potentially also switched capacitors that can handle very high voltage and currents. Study up before you build to optimize your design.

If there's interest, I can create some videos that go more into my strategy for building and matching these types of antennas. It's a fun build!

Current version: 2021.06.14-3146678 @ master