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    Amateur Radio (G3TXQ) - Common-mode chokes    An in depth look into RF Chokes by G3TXQ.   
  

   Amateur Radio (I0QM) - 1:1 Coax Balun  An insight of how to make a 1:1 Balun from coax cable.

Understanding HF Propagation  VE2XIP editions Amateur Radio views and reviews for Beginners

  Smith Chart Tutorial Invented by Phillip H. Smith in 1939. Tutorial papers by Frank .A.Lynch
 

HF Propagation by G4UCJ WHAT IS THE MYSTERIOUS 'E' LAYER? The E LAYER of the ionosphere is the stuff of radio legends, fantastic feats and has puzzled scientists for as long as they have known about it's existence!