Amateur Radio, Part 3
11 entries in the Amateur Radio, Part 3 compendium.
Universal Software Radio PeripheralOpen-source hardware and software for software-defined radio.Vintage amateur radioPreserving and operating radio gear from the vacuum tube era.Voice-operated switchAutomatic switch that activates on sound above a threshold.Wide-coverage Internet Repeater Enhancement SystemYaesu's VoIP standard linking amateur repeaters via DTMF.Yagi–Uda antennaA directional parasitic array invented in 1926 by Shintaro Uda.Amateur radio licensing in ChinaTwo documents govern amateur radio: operation certificate and station license.Amateur radio call signsInternationally assigned identifiers for amateur radio operators and stations.Amateur radio international operationInternational ham operation via reciprocal agreements and permits.ITU prefixITU allocates international call sign prefixes for all radio and television stations.Non-ITU prefixNon-ITU prefixes used in disputed or unrecognized areas.Amateur radio frequency allocationsNational and international rules govern which frequencies amateurs may use.
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