Ferrite Sleeve Loop

[pjxii]

Here's a very convincing demonstration of an FSL on longwave. I obtained something similar tuned for MW with a 1/4" plug to fit into my LA30 and a wider, smaller diameter design for longwave. They really do make the S-meter jump very high!

https://m.youtube.com/watch?v=ctRqnCVZrTg

 

[WA8ZTZ]

Interesting demo.

Didn't see a spec for the ferrite material type.

 

[ka3jjz]

You can find a few more articles on FSL from SWLing.com using the following search;

https://swling.com/blog/?s=FSL

Undoubtedly a Google search will come up with more - and maybe some of our LW/MW friends can chime in...

Mike