Amateur radio

communication code with signals representing letters, punctuation marks and numbers

use of designated radio frequency spectrum for purposes of non-commercial exchange of messages

The NATO phonetic alphabet, officially the International Radiotelephony Spelling Alphabet, is an internationally recognized set of names for the letters of the Latin alphabet and the Hindu-Arabic digits. It is most commonly used in radio communication, where the usual names of the letters are likely to be misheard. It was defined in 1955–1956 by the International Civil Aviation Organization (ICAO).

type of radio antenna

communication flowing in both directions simultaneously

radiotelegraphy message code

pioneering five-bit character encodings

amateur operator of radio communications equipment

modulation scheme for transmissions

written confirmation of two-way radiocommunication between two amateur radio stations or a reception of a signal

balloon released into the stratosphere, most commonly weather balloons

electrical switch used to transmit text messages in Morse code

picture transmission method used mainly by amateur radio operators

method of radio transmission, in which a sinusoidal carrier wave is switched on and off. Information is carried in the varying duration of the on and off periods of the signal, e.g. by Morse code

transmitting at reduced power in amateur radio

brevity code for Ham radio signal reports

the world in "numbered" squares

device to convert Morse code radio signals into audible tones

simplest form of amplitude-shift keying modulation; represents digital data as the presence or absence of a carrier wave

electronic instrument that measures the resonant frequency of nearby unconnected radio frequency tuned circuits

Morokulien (), also known as Fredsriket ("The Republic of Peace"), is a symbolic area on the Norway–Sweden border. A peace monument was erected there in 1914 to mark a century of peace between the two countries, and in 1959 the site became the ceremonial microstate of Morokulien during a joint Swedish–Norwegian radio broadcast. The site is widely regarded as the world's first transboundary peace park. In 2025, Morokulien became home to the world's first bi-national police station, jointly staffed by Norwegian and Swedish officers. The area functions as a cross-border tourist destination and cu

American amateur radio organization

thumb|300px|right|The power of an AM radio signal plotted against frequency. fc is the carrier frequency, fm is the maximum modulation frequency

station operating on frequencies allocated for ham or other non-commercial use

open source amateur radio mode

type of amateur radio mode

practice of radio or television stations or networks identifying themselves on-air

right|thumb|A group of amateur radio operators during DX-pedition to The Gambia in October 2003 thumb|Amateur radio expedition to Cape Verde in October 2001.

structured vocabulary for voice communication

Signal strength indicator

a combined receiver and transmitter that retransmits signals, extending their range

science museum in Toronto, Canada

switch that operates when sound over a certain threshold is detected

telecommunications plan to use frequency bands

product family of software-defined radios

annual amateur radio exercise

type of satellite that transmits amateur radio

thumb | Phone Patch in Vietnam War, 1969 An autopatch, sometimes called a phone patch, is a feature of an amateur radio repeater, two-way radio, or base station to access an outgoing telephone connection. Users with a transceiver capable of producing touch tones (DTMF signals) can make a telephone call, typically limited by settings in the autopatch module to be only to flat-rate numbers, such as local calls or toll-free numbers.

class of large multielement directional wire radio transmitting antennas

operating signal for "request to communicate"

network of computers

room or structure used for housing radio equipment