Crystal Sets To Sideband A Guide To Building Your Own Amateur Radio Station Frank W Harris by Frank W. Harris instant download after payment.

Radio produces action at immense distances with no physical connection that can be perceived by our senses. A modern way to demystify radio is to say that radio is simply a kind of light that our eyes cannot see. To those of us addicted to shortwave radio, it’s an adventurous realm that can be explored. When we listen to our radio receivers it is comparable to using the Hubble telescope to explore the heavens. Shortwave is fascinating because you can’t predict what you are going to hear. You might hear a radio broadcast from an exotic foreign capitol.
You might pick up an SOS from a ship sinking in a storm or maybe weather reports from a radio amateur on Pitcairn Island. The next evening the same frequency band might be completely empty except for two hams on the other side of your own town discussing the Super Bowl. Or you might receive coded messages intended for some undercover spy lurking in our country.
I’m not kidding. I routinely hear such coded messages consisting of groups of letters on the 10.1 and 28.1 MHz ham bands. The codes are usually sent in Morse code, but sometimes you will hear a voice reciting the letter groups. Sometimes the woman announcer finishes by saying, “Thank you for decoding this message!” Since hams are forbidden to use codes or modulation modes that are not easily decoded, these communications are at least illegal.