The DXCC, or DX Century Club, is an award (and registered trademark) granted by ARRL, the American Radio Relay League, given for contacting by means of amateur radio with other operators in at least 100 "entities" and "confirming" those contacts by way of a QSL card, or the ARRL's Logbook of the World program. In the USA and its territories, an operator must be an ARRL member to receive the award. DX can refer to: a common telegraphic abbreviation that stood for a signal that travelled a very long distance. ... The American Radio Relay League (ARRL) was founded in May 1914 by Hiram Percy Maxim. ... 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). ...

Entities are usually, but not always, countries. For example, Hawaii is a separate entity due to its separation from the rest of the USA. See the DXCC Rules for complete criteria. State nickname: The Aloha State Other U.S. States Capital Honolulu Largest city Honolulu Governor Linda Lingle Official languages Hawaiian and English Area 28,337 km² (43rd)  - Land 16,649 km²  - Water 11,672 km² (41. ...

Communication may be by voice, Morse code, or other modes such as RTTY. Separate awards and endorsements of the basic award are available for operating using specific modes or radio bands, such as using only amateur satellites (see AMSAT or OSCAR). Morse code is a system of representing letters, numbers and punctuation marks by means of a code signal sent intermittently. ... Radioteletype (RTTY) is a telecommunications system consisting of two teleprinters linked by a radio link. ... AMSAT is both a generic name for Amateur Radio satellite organisations world-wide, but in particular is the name of the Radio Amateur Satellite Corporation of North America (AMSAT-NA) with headquarters at Silver Spring, Maryland, near Washington DC. Other national organisations exists, such as AMSAT Germany (AMSAT-DL), AMSAT... This page is about the OSCAR, the communications satellite. ...

Full details are at ARRL HQ.