Chelsea Theory Presentations


Characteristic Impedance

What the heck is characteristic impedance, anyhow? We know that, for example, a typical coax feed line has a 50 Ohm “characteristic impedance,” but you won’t get that measurement with a DMM.

You will be amazed at what you can grasp once you understand what a characteristic impedance represents and how it does it.


Why Coax and Not Hookup Wire

Did you ever wonder what the magic formula was for when to use coax and when ordinary, everyday hookup wire is okay to use? Join the crowd. But look in here for a little clarification.


The Near Field” What’s That?


Phasing Vertical 1/4 Wave Antennas for Directivity

This web page looks at the phasing of vertical pairs for electromagnetic directional control.



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