Building a balun for a delta loop. I had same advice as at first i wanted to build an air coil balun. But i was told to use an ferriet coil. So i did. 

Just an simple straight true 4:1 balun. There are loads of pages describing how and why it works and how to make them. So i won’t bother anyone with that.

Instead i build one and yes it worked…

I used 2 100ohm resistors to test the setup. It nicely gave me 50 ohms.

Now on with the delta loop for 20m (fielddays) and 15m (summer vacation)..

After putting it in a casing i got some different results but it’s fine.

Next up. Making some wires and make it in to a deltaloop.