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1.
A two way radio device for short and long distance communication. There are many ham operators around the world and most ham radios are able to talk around the world depending on the solar and ionosphereic conditions. A license is required to operate these devices.
I was on my Ham Radio today and talked to a jerk in Russia.
by WolfMan April 22, 2005
 
2.
A radio service authorized by the government in the form of an issued license. This entitles one to use specific frequency bands for 2-way communication. There are more than 800,000 Ham Radio Operators in the US, and more than 3 Million world wide. Many modes are available. Morse Code, AM (voice), FM (Voice), SSB (Voice), PSK31 (Digital), SSTV, ATV, FKSK, Fax, AMTOR, PACTOR, CLOVER, ect. Up to 1500 Watts of Power on some bands.
From the U.S., I was talking to a Ham Radio friend in Argintena on 20 Meters.
by T. L. Peters'' October 23, 2006
 
3.
A slang term for Amateur Radio. Generally speaking, "Hams" are older men (50 years+) with limited social skills and are generally viewed as misfits
Dude, who is that strange old man living on the corner with all the weird antennas? Oh, that fat one? he's a Ham Radio Operator
by JC7 December 26, 2010