https://youtube.com/playlist?list=PLGF140BA5wtWgW9bAd6DtF3MaYbhPtFwd

Found this virtual course on YouTube. It goes pretty deep into how radios actually work. I thought you guys would enjoy watching them. 

Taking Gil's idea for using an 82 toroid I built this 64:1 transformer. Although the 3D printed box is a much more efficient use of space, I don't currently own a printer. I did find that a Hammond 1551HBK is about as good as it gets as far as size and ruggedness. The overall dimensions are 60x35x20mm. This does not have a ground connection but i have found that a small coil in my coax generally takes care of any RF on the shielding.  You cannot view this attachment.

Ive been plagued with a noisy utility pole since i moved to my new QTH and it has grown to an S8. I think ive narrowed it pretty close driving around with the AM reciever running. It totally overpowers all the AM broadcast several hundred yards away. I was wondering if any of you guys had a good homebrew DF antenna design that i could build to pinpoint this problem.   

Looking for an unbuilt/built internal ATU for the Elecraft K1.