[{"n": "Amateur radio", "u": "/e/amateur-radio/amateur-radio/", "s": "Non-commercial radio communication for experimentation, recreation, and emergency service."}, {"n": "3Y0J Bouvet Island DXpedition", "u": "/e/amateur-radio/3y0j-bouvet-island-dxpedition/", "s": "A rare activation of the second-rarest DXCC entity, Bouvet Island."}, {"n": "Amateur Radio Digital Communications", "u": "/e/amateur-radio/amateur-radio-digital-communications/", "s": "Amateur radio's early IP network, now partly a research telescope."}, {"n": "Amateur radio in India", "u": "/e/amateur-radio/amateur-radio-in-india/", "s": "Amateur radio in India has over 22,000 licensed users as of 2007."}, {"n": "Amateur radio net", "u": "/e/amateur-radio/amateur-radio-net/", "s": "A scheduled gathering of amateur radio operators for a common purpose."}, {"n": "Amateur radio satellite", "u": "/e/amateur-radio/amateur-radio-satellite/", "s": "Amateur-built satellites enabling free radio communication for licensed operators worldwide."}, {"n": "Amateur television", "u": "/e/amateur-radio/amateur-television/", "s": "Amateur television transmits broadcast-quality video over ham radio frequencies."}, {"n": "American Radio Relay League", "u": "/e/amateur-radio/american-radio-relay-league/", "s": "Largest US amateur radio membership association, founded 1914."}, {"n": "American Radio Relay League, Inc. v. FCC (1980)", "u": "/e/amateur-radio/american-radio-relay-league-inc-v-fcc-1980/", "s": "Court upheld FCC regulations on linear amplifiers despite sympathy for amateur radio."}, {"n": "ARRL Numbered Radiogram", "u": "/e/amateur-radio/arrl-numbered-radiogram/", "s": "Brevity codes for rapid ARRL/RRI radiogram transmission during congestion."}, {"n": "Automatic transmission system", "u": "/e/amateur-radio/automatic-transmission-system/", "s": "Automated system for unattended broadcast transmitter operation."}, {"n": "Autopatch", "u": "/e/amateur-radio/autopatch/", "s": "A radio feature for accessing telephone networks via DTMF tones."}, {"n": "Balloon Experiments with Amateur Radio", "u": "/e/amateur-radio/balloon-experiments-with-amateur-radio/", "s": "Canadian amateur radio high-altitude balloon experiments starting in 2000."}, {"n": "Baudot code", "u": "/e/amateur-radio/baudot-code/", "s": "Five-bit telegraph code that preceded ITA2 and ASCII."}, {"n": "Beat frequency oscillator", "u": "/e/amateur-radio/beat-frequency-oscillator/", "s": "BFO makes CW and SSB signals audible in radio receivers."}, {"n": "Boat anchor (metaphor)", "u": "/e/amateur-radio/boat-anchor-metaphor/", "s": "A metaphor for obsolete, cumbersome equipment or code."}, {"n": "Braid-breaker", "u": "/e/amateur-radio/braid-breaker/", "s": "A filter that prevents TV interference from nearby HF transmitters."}, {"n": "Computer aided transceiver", "u": "/e/amateur-radio/computer-aided-transceiver/", "s": "A serial protocol for computer control of amateur radio equipment."}, {"n": "DX-pedition", "u": "/e/amateur-radio/dx-pedition/", "s": "Expeditions to rare locations for amateur radio contacts and awards."}, {"n": "Echoes of Apollo", "u": "/e/amateur-radio/echoes-of-apollo/", "s": "Celebrating the past, living the present; promoting the future of space exploration."}, {"n": "Etymology of ham radio", "u": "/e/amateur-radio/etymology-of-ham-radio/", "s": "From telegraph slur to proud amateur radio identity."}, {"n": "Frequency plan", "u": "/e/amateur-radio/frequency-plan/", "s": "A band plan defines how a radio band is used and shared."}, {"n": "Global Educational Network for Satellite Operations", "u": "/e/amateur-radio/global-educational-network-for-satellite-operations/", "s": "A software networking standard for educational satellite ground stations."}, {"n": "Homebuilt machines", "u": "/e/amateur-radio/homebuilt-machines/", "s": "Homebuilt machines are constructed by amateurs from scratch, plans, or kits."}, {"n": "International Lighthouse and Lightship Weekend", "u": "/e/amateur-radio/international-lighthouse-and-lightship-weekend/", "s": "Annual amateur radio event promoting lighthouse preservation and goodwill."}, {"n": "Junk box", "u": "/e/amateur-radio/junk-box/", "s": "A ham's collection of spare parts for building and repair."}, {"n": "Keyer", "u": "/e/amateur-radio/keyer/", "s": "A device for hand signaling via switches, in telegraphy and computing."}, {"n": "Logbook of The World", "u": "/e/amateur-radio/logbook-of-the-world/", "s": "ARRL's electronic QSL verification service for amateur radio awards."}, {"n": "LowFER", "u": "/e/amateur-radio/lowfer/", "s": "LowFER is license-free experimental radio below 300 kHz."}, {"n": "Maidenhead Locator System", "u": "/e/amateur-radio/maidenhead-locator-system/", "s": "A global geocode system for amateur radio location exchange."}, {"n": "Maritime mobile amateur radio", "u": "/e/amateur-radio/maritime-mobile-amateur-radio/", "s": "Amateur radio operation from vessels at sea using /MM suffix."}, {"n": "Morse code", "u": "/e/amateur-radio/morse-code/", "s": "A method of encoding text using dots and dashes."}, {"n": "On–off keying", "u": "/e/amateur-radio/on-off-keying/", "s": "OOK encodes data as carrier presence or absence."}, {"n": "Amateur radio operator", "u": "/e/amateur-radio/amateur-radio-operator/", "s": "Licensed two-way communicators on amateur radio frequencies worldwide."}, {"n": "Portable operation (amateur radio)", "u": "/e/amateur-radio/portable-operation-amateur-radio/", "s": "Portable operation uses /P suffix for remote amateur radio."}, {"n": "PSK Reporter", "u": "/e/amateur-radio/psk-reporter/", "s": "Signal reporting network mapping amateur radio reception worldwide."}, {"n": "Q code", "u": "/e/amateur-radio/q-code/", "s": "Standardized three-letter codes for unambiguous radio communication."}, {"n": "QRP operation", "u": "/e/amateur-radio/qrp-operation/", "s": "Low-power amateur radio operation emphasizing efficiency and skill."}, {"n": "QRZ.com", "u": "/e/amateur-radio/qrz-com/", "s": "Amateur radio callsign lookup and community website."}, {"n": "QSL card", "u": "/e/amateur-radio/qsl-card/", "s": "A postcard-sized confirmation of radio contact or reception."}, {"n": "Amateur radio propagation beacon", "u": "/e/amateur-radio/amateur-radio-propagation-beacon/", "s": "Beacons probe radio propagation across bands from LF to microwave."}, {"n": "RIGblaster Nomic", "u": "/e/amateur-radio/rigblaster-nomic/", "s": "A universal radio/computer interface replacing microphone, speaker, and PTT."}, {"n": "S meter", "u": "/e/amateur-radio/s-meter/", "s": "An S meter indicates signal strength on communications receivers."}, {"n": "SatNOGS", "u": "/e/amateur-radio/satnogs/", "s": "Open source platform for a distributed satellite ground station network."}, {"n": "Shuttle Amateur Radio Experiment", "u": "/e/amateur-radio/shuttle-amateur-radio-experiment/", "s": "Program enabling ham radio from Space Shuttle for global contacts."}, {"n": "Sideband", "u": "/e/amateur-radio/sideband/", "s": "Sidebands carry the information in a modulated radio signal."}, {"n": "Slow-scan television", "u": "/e/amateur-radio/slow-scan-television/", "s": "Narrowband still picture transmission for amateur radio."}, {"n": "SOTA Mapping Project", "u": "/e/amateur-radio/sota-mapping-project/", "s": "Mapping resources for SOTA summits, built by radio amateurs."}, {"n": "Spirit of Knoxville", "u": "/e/amateur-radio/spirit-of-knoxville/", "s": "Amateur balloon project aiming to cross the Atlantic via radio telemetry."}, {"n": "Amateur radio station", "u": "/e/amateur-radio/amateur-radio-station/", "s": "A station built and operated by a licensed amateur radio operator."}, {"n": "Station identification", "u": "/e/amateur-radio/station-identification/", "s": "On-air identification satisfies licensing, branding, or both."}, {"n": "Telegraph key", "u": "/e/amateur-radio/telegraph-key/", "s": "A specialized switch for sending Morse code pulses."}, {"n": "Transverter", "u": "/e/amateur-radio/transverter/", "s": "A device that shifts a transceiver's operating frequency range."}, {"n": "Tropospheric propagation", "u": "/e/amateur-radio/tropospheric-propagation/", "s": "Tropospheric propagation bends VHF/UHF signals over the horizon via weather inversions."}, {"n": "Universal Software Radio Peripheral", "u": "/e/amateur-radio/universal-software-radio-peripheral/", "s": "Open-source hardware and software for software-defined radio."}, {"n": "Vintage amateur radio", "u": "/e/amateur-radio/vintage-amateur-radio/", "s": "Preserving and operating radio gear from the vacuum tube era."}, {"n": "Voice-operated switch", "u": "/e/amateur-radio/voice-operated-switch/", "s": "Automatic switch that activates on sound above a threshold."}, {"n": "Wide-coverage Internet Repeater Enhancement System", "u": "/e/amateur-radio/wide-coverage-internet-repeater-enhancement-system/", "s": "Yaesu's VoIP standard linking amateur repeaters via DTMF."}, {"n": "Yagi–Uda antenna", "u": "/e/amateur-radio/yagi-uda-antenna/", "s": "A directional parasitic array invented in 1926 by Shintaro Uda."}, {"n": "Amateur radio licensing in China", "u": "/e/amateur-radio/amateur-radio-licensing-in-china/", "s": "Two documents govern amateur radio: operation certificate and station license."}, {"n": "Amateur radio call signs", "u": "/e/amateur-radio/amateur-radio-call-signs/", "s": "Internationally assigned identifiers for amateur radio operators and stations."}, {"n": "Amateur radio international operation", "u": "/e/amateur-radio/amateur-radio-international-operation/", "s": "International ham operation via reciprocal agreements and permits."}, {"n": "ITU prefix", "u": "/e/amateur-radio/itu-prefix/", "s": "ITU allocates international call sign prefixes for all radio and television stations."}, {"n": "Non-ITU prefix", "u": "/e/amateur-radio/non-itu-prefix/", "s": "Non-ITU prefixes used in disputed or unrecognized areas."}, {"n": "Amateur radio frequency allocations", "u": "/e/amateur-radio/amateur-radio-frequency-allocations/", "s": "National and international rules govern which frequencies amateurs may use."}, {"n": "1.25-meter band", "u": "/e/amateur-radio/1-25-meter-band/", "s": "A VHF band with a long history and dedicated North American following."}, {"n": "2-meter band", "u": "/e/amateur-radio/2-meter-band/", "s": "A popular VHF band for local and emergency communications."}, {"n": "5-centimeter band", "u": "/e/amateur-radio/5-centimeter-band/", "s": "A secondary microwave band for amateur and satellite use."}, {"n": "5-meter band", "u": "/e/amateur-radio/5-meter-band/", "s": "A VHF band bridging 6-meter propagation with unique sporadic E and tropospheric paths."}, {"n": "6-meter band", "u": "/e/amateur-radio/6-meter-band/", "s": "The VHF 'magic band' with occasional HF-like propagation."}, {"n": "6-millimeter band", "u": "/e/amateur-radio/6-millimeter-band/", "s": "The only exclusively amateur EHF band, requiring home-built equipment."}, {"n": "8-meter band", "u": "/e/amateur-radio/8-meter-band/", "s": "Lowest VHF amateur band, bridging HF propagation with VHF characteristics."}, {"n": "9-centimeter band", "u": "/e/amateur-radio/9-centimeter-band/", "s": "A secondary-use SHF band for amateur radio and satellite."}, {"n": "10-meter band", "u": "/e/amateur-radio/10-meter-band/", "s": "A wide HF band with variable propagation and many modes."}, {"n": "13-centimeter band", "u": "/e/amateur-radio/13-centimeter-band/", "s": "A UHF microwave band for amateur radio and satellite use."}, {"n": "15-meter band", "u": "/e/amateur-radio/15-meter-band/", "s": "A shortwave band for long-distance communication via F-2 layer reflection."}, {"n": "20-meter band", "u": "/e/amateur-radio/20-meter-band/", "s": "A popular shortwave band for long-distance communication and contests."}, {"n": "23-centimeter band", "u": "/e/amateur-radio/23-centimeter-band/", "s": "A secondary UHF band for amateur radio and satellite use."}, {"n": "30-meter band", "u": "/e/amateur-radio/30-meter-band/", "s": "A contest-free HF band with limited phone privileges worldwide."}]