Communication

The first receivers made use of something called a “coherer”. It’s really just a pile of metal filings that are loosely placed between two electrodes.

Before discussing radio waves and how to create them, I want to point out that if you understand the theory behind creating radio waves, you will understand how to create micro waves or X-rays. What are radio waves?

The academically anemic infographic under discussion. Click for a larger image.

I've seen this infographic (at right) posted several times on the internet. My inner engineer couldn't help but to tinker with it and give it that little something extra[0].  I'll dial it up to '11' by making it useful without writing a dissertation on each subject. Here goes...