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.
Questions about the surface of the Earth as it affects radio propagation and antenna system design and installation. For questions about RF grounds and shields, counterpoises, virtual grounds, etc. us…
Signal to Noise Ratio - any questions about improving or detecting an SNR or lowering your noise floor.
an emergency preparedness/ contest run by ARRL in the United States and Canada the last full weekend of June each year.
for questions that relate to the efficiency of a system or a component. The efficiency is the amount of useful work performed by the system or component (in radio applications, typically …
Questions regarding the modification of existing radio equipment to add features or improve performace
Questions relating to determining your location or the location of a QSO based on one of the various systems of measurement (lat/lon, GPS coordinates, ARRL section, CQ Zones, ITU Zones, Maidenhead Gri…
American Radio Relay League (ARRL), the largest association of amateur radio enthusiasts in the USA
Questions specific to rules, regulations, and practices in European countries.
for questions relating to Slow-Scan Television (SSTV) operations.
Questions about shortwave listening and similar low-frequency reception activities.
Questions about the practice of, and legal requirement to, identify your transmissions using your call sign.
Controlling a transceiver using software running on a separate personal computer. See also: [software-defined-radio], [audio-interface].
Questions about low-noise amplifiers (LNAs) and their application in receiving antenna systems.
the frequency range 3-30 kHz.
Questions related to writing software (programming) for Amateur Radio purposes.
Satellite navigation systems, including GPS. Questions should be related either to amateur radio operations (e.g. APRS tracking) or the theory of positioning using radio signals; questions merely abou…