What is Amateur Radio?

Amateur radio, commonly called "ham radio", is a hobby enjoyed by many people throughout the world (as of 2004 about 3 million worldwide, 60,000 in UK, 70,000 in Germany, 5,000 in Norway, 57,000 in Canada, and 700,000 in the USA). A holder of an Amateur Radio license has studied and passed required tests in his or her country and been issued a call sign by its government. This call sign is unique to the operator and is often a source of pride. ...

other:

by Jorgen SM3LIV

HAM Radio
How do I communicate?
Abbreviations
Alphabets
Callsigns

DXCC Country List
License
Morse Code
Q-code
QSL card

by  Mark ON4WW

Operating Practice

by American Radio Relay League

What is..
Welcome to Amateur Radio!

by Polski Związek Krótkofalowców (pol)

Co to jest krótkofalarstwo?

by Wikipedia  (pol)

Krótkofalarstwo ?