Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)


amateur radio

Also called "ham radio," it is wireless voice communications that can reach "ham operators" up to hundreds of miles away, sometimes thousands. Amateur radio is often a hobby, but can also be a public service. Dating back to the early 1900s when Morse code was transmitted rather than voice, amateur radio operates in the shortwave frequency bands using AM, FM, SSB (single sideband) and other modulation methods.

Licensing Is Required
In order to use an amateur radio, applicants must pass a test, which varies depending on the country. There are several test levels, each one granting more privileges to the operator, such as range of frequencies and antenna power. Licensed operators are issued a "callsign," which identifies them on the air.

In the U.S., amateur radio's origins lingered for decades, requiring Morse code proficiency to obtain a basic license until 1991. Finally, in 2007, Morse code was dropped for advanced licenses. See EchoLink.


Using voice over IP (VoIP) over the Internet to connect licensed amateur radio stations (ham radios) to each other around the world. Developed in 2002 by Jonathan Taylor, EchoLink greatly extends the reach of ham operators. Only licensed radio operators are authorized to use the software. See ham.

Personal Use Only

Before/After Your Search Term
AM radioAmazon
Am286Amazon Alexa
Am386Amazon Appstore
Am486Amazon Cloud Drive
Am586Amazon Dash
Am5x86Amazon Dash Wand
AMAAmazon Dot
Amara's lawAmazon Echo
AMASSAmazon Elastic Compute Cloud

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
ProgrammingHealthcare IT
System design