A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Questions about the design, selection, building, testing, mounting, or properties of antennas. See also specific tags: [antenna-theory], [antenna-construction], [dipole], etc.
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Designing antennas, selecting antennas for specific applications, properties of a given antenna design.
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Questions specific to rules, regulations, and practices in the United States of America.
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Radio devices that use digital signal processing in place of analog electronic components to manipulate RF signals.
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Questions regarding laws or other legal regulations pertaining directly to amateur radio. Also tag your question with the relevant location. If in doubt, always seek professional legal advice.
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Materials and methods for building antennas, and design of supporting (non-conductive) structures. For design of antennas themselves, use [antenna-theory] instead.
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the frequency range 3-30 MHz. This tag may also be used for questions about the 160 meter band (1.8 MHz), which while not HF is often referred to as such due to its similar propagati…
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for questions about the theory and structure of receivers.
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Transmission of digital signals over Amateur Radio, including modes like PSK-31, RTTY, JT-65, JT-9, etc.
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Questions about RF propagation including measurements, beacons, modes (ionospheric, tropospheric, ground wave), etc.
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Questions dealing with handmade (Do It Yourself) radios and radio accessories.
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the frequency range 30-300 MHz.
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Continuous Wave (CW), or Morse code over audible tones. Use this tag for any question relating to Morse code.
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Questions related to the licensing of amateur radio operators and stations. Also tag your question with the relevant location.
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Anything to do with wire antennas, including how to build one, how different wire antennas perform, how to tune them or when to use a balun, and what types of wire work best in certain antennas.
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Questions about power ratings and restrictions, including maximum power by law or for certain components, or about calculating power in certain situations.
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the frequency range 300-3000 MHz.
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Use this tage for questions regarding RFI (Radio Frequency Interference).
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Questions about coaxial cables, including different types of cable, connectors, adapters, and other topics.
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Questions which involve the properties or applications of individual electronic components.
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The system composed of an antenna and a feed line, and possibly also an RF ground connection, antenna tuner, balun, phasing device, et cetera.
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for questions relating to dipole antennas.
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Discussion related to the rtl-sdr project, which enables certain television dongles and other hardware to be used as a cheap SDR receiver
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Amateur radio satellites refer to any artificial object in Earth orbit that are useful for amateur radio purposes.
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a manufacturer of radio equipment. Use this tag for questions relating specifically to Baofeng products.
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develop software-defined radios and general signal processing applications.
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Mobile operations (car, motorcycle, boat or other vehicle)
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Handheld Transceiver, or Handie-Talkie. A hand-held radio that looks like a large walkie-talkie, capable of transmitting and receiving amateur radio bands. Often can receive other bands as well.
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A device that receives a signal and re transmits it either in the same band or by re-modulating it in a different band.
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for general questions relating to transceivers.
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the measure of the opposition that a circuit presents to an alternating current when a voltage is applied. This is a force of much interest to the radio amateur especially surrounding th…
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for questions about which frequencies to use or not use in certain locations/situations.
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Questions related directly to the mode of communication (SSB, CW, digital, etc).
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Devices for connecting balanced and unbalanced feed lines/antennas. Also covers questions about ununs, unbalanced-to-unbalanced connection.
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Questions about fixed impedance matching networks, the necessity of impedance matching, etc.